120612 Standard Specification Stage2 Interim Report Appendices

7/21/2019 120612 Standard Specification Stage2 Interim Report Appendices

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Standardised Specification

and Standard Details

Stage 2 Report

Progress Report on Local Authority SpecificationVariations

Appendices to the Report

June 2012


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Images on cover sheet courtesy of HMEP

Images in main report courtesy of Midlands Highway Alliance

1STANDARDISED SPECIFICTION AND STANDARD DETAILS

JUNE 2012


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REVISION SCHEDULE

Standard Specification and Standard Details

Stage 2 Progress Report

Rev Date Details Prepared by Reviewed by Approved by

01 13/04/12 Draft Ed Varley

Principal Engineer

John Cole

Principal

Engineer

Anna Moore

Associate

02 07/06/12 Issue 1 Ed Varley

Principal Engineer

John Cole

Principal

Engineer

Anna Moore

Associate


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Contents

CONTENTS

COMMENT AND FEEDBACK 4

APPENDICES 5

Appendix 1 Series 500 Drainage andService Ducts 6

Appendix 2 Series 700/900 RoadPavements - Bituminous Bound Materials 20

Appendix 3 Series 1100 Footways andPaved Areas 26

Appendix 4 Series 1200 Road Markingsand Road Studs 50

Appendix 5 Series 1300 Street LightingColumns and Brackets 52

Appendix 6 Series 1700 StructuralConcrete 53

Appendix 7 Series 1800 - StructuralSteelwork 55

Appendix 8 Winter Maintenance Materials56

ABBREVIATIONS USED 62

LIMITATIONS 63


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Foreword

COMMENT AND FEEDBACK

The HMEP Programme Board would welcome any comments and feedback onthis report so that the final product may be reviewed, improved and refined to

give the sector the best advice possible. If you wish to make a comment,please email them to [email protected] the headerFeedback on the Standard Specification and Standard Details.


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mailto:[email protected]:[email protected]


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Appendices

APPENDICES


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Appendix 1 Series 500 Drainage and Service Ducts


Summary of information provided by local highways authorities as part of the HMEP

survey carried out in October 2011.

SR Series Supplementary Addi tional Clauses

The following table summarises where authorities have varied drainage clauses

together with a commentary on their relevance to the Specification.

Addi tional Clauses Additions/Changes Comment

Resetting of Covers

and Frames;

Defines further/specific

requirements for the re-setting

of footway, and carriagewayironwork;

The resetting of covers and

frames is considered to be an

aspect that requires furtherreview and possible update

to the current SHW.

Defines specific requirements

for the resetting of British

Telecom carriageway ironwork

using resin bedding and resin

mortar;


for resetting of British Telecom

ironwork in footways;


for the re-setting Fire Hydrants

in footways and carriageway.

Special Treatment

of Existing Sewers,

Drains, Ducts,

Services and the

like.

Provides additional general

requirements in connection with

existing sewers, drains, ducts

and services.

Current SHW considered to

be acceptable and therefore

unnecessary to include.

Works on Existing

Drains Sewers and

Manholes;

Provides general requirements

with regard to taking measures

when working on existing drains

to prevent debris from entering

the system.

Also introduces specific

requirement to prove by CCTV

survey downstream runs ofexisting drainage and make

good where necessary where





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new connections are made into

the system.

Gully Set in Verge; Provides general requirementsfor the construction of new

gullies set in verge and

treatment to

replaced/abandoned gullies.

Considered to be specific toThe Council and therefore

inappropriate to include

within the current SHW.

Small Headwall; Provides general requirements

for the construction of small

headwalls using either concrete

block and in-situ concrete or

concrete bag construction.

Considered to be specific to

The Council and therefore



Reinstatement of

Drainage and

Service Ducts in the

Carriageway,

Footway and Verge

(Trench

Reinstatement);


for trench reinstatement in both

carriageways and verges.




Disconnect and Fill

Existing Manhole,Catchpit or Gully.


for the removal and backfilling ofredundant chambers and

gullies.


be acceptable and thereforeunnecessary to include.

Existing Drainage; Provides general requirements

for the renewal of filter drains

and drain runs




Deep Bored

Soakaways;

Provides specific requirements

for the construction of deep

bored soakaways.


Kent CC and therefore



Adjustment of

Ironwork.

Reconfirms that the

replacement/adjustment of

existing frames, covers and

gratings shall be carried out in

accordance with the SHW.

As per current SHW

therefore considered


Pipes for Drainage

and for Service

Ducts;

Requires Sulphate Resisting

Portland cement to be used and

all standard mixes of concrete

used in drainage works to be the

GEN series and not ST


Council and therefore




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references.

Excavations for

Pipes andChambers;

Modifies trench widths and

provides additional generalrequirements for the

construction of drainage runs.


Council and thereforeinappropriate to include


Bedding, Laying

and Surrounding of

Pipes (Including

Cable Ducts);

Reconfirms requirements of the

SHW in respect of laying new

drainage pipes.

Reclassifies required pipe

bedding requirements.

Provides requirements for whennew drains are laid below

groundwater level.





Jointing of Pipes; Provides general requirements

for jointing of pipes.




Backfilling of

Trenches and Filter

Drains;

Requires the use of sub-base

material Type 2 to be used in

backfilling of trenches.





Connecting to

Existing Drains;

Chambers and

Channels;

Provides additional

requirements in respect of

entering/breaking into existing

drains, sewers or chambers.




Chambers; Required GEN series concrete

mixes to be used in the

construction of chambers.

Provided additionalrequirements in connection with

the construction of chambers.





Gullies and Pipe

Junctions.

Requires the use of sub-base

material Type 2 to be used in

backfilling of gullies.





Low Pressure High

Volume Jetting of

Drainage Systems;


for the jetting of piped drainage

systems.

This additional clause

replicates what is already

included within the SHW

under Clause 521.


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Existing Drain

Cleansing;


for cleaning/clearing existing

gullies and chambers


Council and relates to

maintenance requirements,

therefore inappropriate to

include within the current

SHW.

Replacing, Raising

or Lowering Covers,

Gratings and

Frames on Existing

Chambers and

Gullies.


for replacing, raising or lowering

frames, covers and gratings on

existing chambers.

The resetting of covers and

frames is considered to be an

aspect that requires further

review and possible update

to the current SHW.

Closed Circuit TV

Inspection of Drains

and Sewers;


for undertaking CCTV inspection

of drains and sewers.

The requirements for carrying

out CCTV inspections are

covered by the current SHW

under Volume 5, Special

Activities, Section 9, Model

Contract Documents For

CCTV Survey of Highway

Drainage Systems.

Oil Interceptor

Units.


for Oil interceptors.

The design and specification

of Oil Interceptors isconsidered to be contract

specific and will generally be

design by the contractor. It is

therefore considered

inappropriate to include any

specific requirements with

regard to Oil Interceptors

within the SHW.

Replacement ofFilter Material in

Existing Filter

Drains;

Provides general requirementsfor replacement of filter material

in existing drains.

Considered to be a contractspecific requirement and

therefore unnecessary to

include in the general SHW.

Drainage Grips. Provides general requirements

for the construction of drainage

grips.

Considered to be outside the

scope of the HMEP project

brief.


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AR Series -Amended Clauses

The following table summarises the various amended clauses received together with a

commentary on their relevance to the Specification.

Heading AmendedClause

Additions/ Changes Comment

Pipes for

Drainage

and Service

Ducts

501.8 Removes current

specification requirements

for draw rope through

ducts.

Considered unnecessary to

remove current SHW

requirements.

Chambers 507.18 Minor addition to current

specification.


incorporate in current SHW.

CombinedDrainage

and Kerb

Systems

516.1 Requires that anycombined drainage and

kerb system shall be the

Beany Block system as

supplied by Marshalls.

Considered inappropriate tospecify a specific type of

system therefore should not be

included in the SHW.

Chambers 507.16 Cross references to

Appendix 5/1 for further

specific requirements for

bedding mortars and

proprietary quick setting

mortars.

Linked to resetting of frames,

covers and gullies. Further

review required to establish

whether current SHW should

be updated in respect of this

issue.

507.19 Provides additional minor

requirements for the

construction/resetting of

chamber covers.


incorporate in current SHW.

Chambers 507.1 Removes reference to

motorway communications

installations and introduces

interceptors as beingdefined as chambers.

Considered appropriate to

remove any reference to

motorways as these will not

be encountered by localauthorities.

507.3 Requires that brickwork to

chambers should be one

brick thick.


include this. Sufficient detail is

provided in the standard

details with regard to the

construction of chambers.

Gullies andPipe 508.1 Removes reference tosumpless gullies as an Considered inappropriate toexclude sumpless gullies as an


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Heading Amended

Clause


Junctions allowable gully option. acceptable option.

508.6 Requires that only ST2concrete shall be used as

backfill to gullies.

Considered inappropriate toadopt the use of ST2 concrete

as backfill to gullies throughout

the sector.

Combined

Drainage

and Kerb

Systems

516.1 Cross references to

Appendix 5/5 for details of

combined drainage

systems.

Current SHW considered

appropriate therefore

unnecessary to include

modification.

Linear

Drainage

Channel

Systems


Appendix 5/6 for details of

combined drainage

systems and removes

reference to Appendix

1/11.




modification.

The

Cleaning of

Existing

Drainage

Systems

520.1 Introduces alternative

requirements and time

frame for the contractor to

carry out cleaning of

existing drainage systems.




modification.

Bedding,

Laying and

Surrounding

of Pipes

503.3 Introduces minor

amendment to current

specification.




modification.

Chambers 507.16 Introduces additional

requirement for the setting

of frames, covers and

gratings which is already

included in Clause 507.18.




modification.

Gullies and

Pipe

Junctions

508.4 Introduces

alternative/additional


gullies.

Linked to resetting of frames,

covers and gullies. Further

review required to establish

whether current SHW should

be updated in respect of this

issue.

Permeable

Backing to

Earth

Retaining

513.1 Introduces

alternative/additional


porous concrete blocks

used in back of wall




modification.


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Heading Amended

Clause


Structures drainage.

Connectingto Existing

Drains

Chambers

and

Channels

506.2 Minor addition to currentspecification.

Considered unnecessary toincorporate in current SHW.


Appendix 5/1 for details on

disconnection of existing

drains.




modification.

Gullies and

Pipe

Junctions


Appendix 5/1 for inclusion

of alternative drawings for

gully construction.




modification.

Backfilling

of Trenches

and Filter

Drains

505.10 New sub-clause cross

referencing to Appendix

5/1 to introduce need for

geotextile filter around filter

drains and filter material.

The adoption of geotextile

lining to filter drains is

considered to be contract

specific. The current

specification/ design for filterdrains included in the SHW is

considered appropriate.

505.11 New sub-clause detailing


the storage of geotextiles

used in filter drains.



geotextiles used in andconstruction of filter drains.



the handling of geotextiles


505.14 New sub-clause

introducing minor addition

with regard to information

to be supplied in respect of

geotextiles used in filter


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Heading Amended

Clause


drains.

505.15 New sub-clauseintroducing minor addition

with regard to certification

in respect of geotextiles



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Summary of Standard Detail Drawings Review- Survey Responses


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The following table provides a summary of the questions and responses to the survey

questionnaire along with initial comment on their relevance to the Specification.

Question Survey Response Comment

Does therange of

specified

material types

(e.g. pipe

types) match

what is readily

available?

Yes = 89.5%,

No = 10.5%

The results of the survey clearly concludethat the current range of specified

materials within/included in the MCHW

SHW is acceptable.

Do you use

pipe types not

specified in the

MCHW?

Yes = 15.55%,

No = 84.4%

Linked to Qu 16 the results of the survey

further conclude that the current range of

specified materials within/included in the

MCHW SHW is acceptable.

Is the range of

specified

drainage

systems

appropriate?

[Note the HA

plans topublish a new

Part listing all

sustainable

drainage

systems, to

reflect the

forthcoming

national

standards for

sustainable

drainage.]

Yes = 67.9%,

No = 32.1%

The direct results to this question are less

conclusive than for previous questions,

however, review of the comments

provided by consultees would suggest

that this is directly due to the lack of detail

included in the current Specification on

Sustainable Drainage Systems (SUDS).

As identified in the question the HA plans

to publish a new part to the Specification

listing all sustainable drainage systems, to

reflect the forthcoming national standards

for sustainable drainage.

It is considered that inclusion of a

specification for SUDS is outside the

scope of the current commission. It is not

possible to pre-empt the outcome of the

Highways Agencys ongoing work on this

aspect. It is therefore concluded that no

further work should be carried out in

respect of SUDS.

Should the

specification

specify a

design life for

constructed

drainage?

Yes = 81.4%,

No = 18.6%

The results of the survey clearly conclude

that the Specification should include a

design life for constructed drainage.

If so, what 0-10 years 0.0% The results from the survey would


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design life

would you

anticipate?

20 years 8.0%

50 years 44.0%

100 years 32.0%

Other 16.0%

suggest that the design life for new

drainage should be a minimum 50 years.

There are considered to be two distinctissues that will impact on the operational

effectiveness of any new drainage asset

during its operational life as detailed

below:

The operational effectiveness of the asset

in respect of its ability to deal with

changes (i.e. any increase) in discharge

flows over time;

The physical construction of the drainage

asset being sufficient to remain

operational and free from major defect.

In respect of Item 1 above, current design

guidance dictates that design flows

include for a 20% uplift to take account of

Climate Change. It is therefore

considered that this aspect is currently

adequately dealt with.

With regard to the as-constructed system

being of an adequate standard to

physically last for the required design life

this will be dependent upon a number of

factors which include:

1. Construction design;

2. Materials used;

3. Operational maintenance.

The construction design of fundamental

elements of any new drainage system (i.e.

chambers, gullies and pipe runs) is based,

in general, on tried and tested principles

which have resulted in the development of

the current Standard Details that are

included within the current SHW.

It is accepted that these Standard Details

will be subject to refinement over time as

new materials and techniques aredeveloped but in principle it is considered

that they currently meet the requirements


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for sound construction design.

It is noted that there are differences

between the Motorway/ Trunk RoadNetwork (for which the current SHW has

been developed) and the local road

network and a number of key drainage

elements that are required for local roads

are not included. An aim of this current

review is to identify and include those

standard construction details that are

currently not covered by the SHW.

The materials to be used in the

construction of drainage systems are

considered, in the main, to be defined well

by the current Specification. Material

specifications for component elements

(i.e. pipes, chamber covers and gratings)

are controlled by standards and codes

that are referenced within the

Specification. Where further detail is

required on the specific requirements of

materials such as pipe bedding and

trench backfill this is provided within the

document.

Maintenance of the drainage system is a

fundamental requirement to ensuring the

operational effectiveness of the system

and prolonging its operational life.

The maintenance regime to be adopted

for drainage systems is not covered by

the SHW as this is generally dealt with

separately by other documentation (i.e.

Network Management Manual).

It is therefore considered unnecessary to

include within the SHW maintenance

requirements for drainage systems.

What is the

actual life of

drainage

encounteredbefore major

renewals or

0-10 years 0.0%

20 years 0.0%

Review of the survey results and

comments received to this question would

indicate that actual life of drainage before

renewals is required is 50 years. Thiswould suggest that the current

Specification is achieving the expectations


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replacement? 50 years 39.3%

100 years 19.6%

Other 41.1%

of Local Authorities.

The results of the survey conclude that

drainage should be specified on a fitnessfor purpose basis.

Should

drainage be

specified on a

fitness for

purpose

basis?

Yes = 72.9%,

No = 27.1%

The adoption of fitness for purpose for

the design and construction of drainage

infrastructure may/will impact on both

Designers and Contractors. The legal

and insurance (i.e. professional

indemnity) implications of adopting a

fitness for purpose basis needs to be

fully investigated which is currently

considered to be outside the scope of this

current review.

For ductile iron

covers what

depth do you

normally

specify for

trafficked

areas?

100mm 23.6%

150mm 76.4%

The results of the survey clearly indicate

that Local Authorities currently prefer and

adopt 150mm deep ductile iron covers for

trafficked areas.

The current Specification specifies that

chamber covers and gully gratings shall

comply with the requirements of BS EN124. Consideration needs to be given to

whether the specification for chamber

covers and gully gratings needs to be

modified to take account of new products

and the issues identified in the response

to Qu 24.

For gully and

manhole

covers in

trafficked

areas is there

an increased

need to rebed

or replace the

covers in the

last 10 years?

Yes = 81.4%,

No = 18.6%

The results of the survey clearly indicate

that there is an increased need to rebed

and replace gully and manhole covers

located in trafficked areas.

A review of the responses as to why this

is occurring identifies the following key

reasons for this problem:

1. Increase in traffic volumes andloading (i.e. increased volume andweight of HGVs);

2. Inappropriate bedding material

and insufficient time for beddingmaterials to cure before trafficking;

3. Poor workmanship (linked to


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STANDARDISED SPECIFICTION AND STANDARD DETAILS

JUNE 2012


available time to make repairs);

4. Design/strength of ironwork;

5. Deteriorating network condition;

6. Theft;

It is considered that further investigation is

undertaken into all of the above aspects

to try and improve the design and

construction specification for chamber

covers, frames and gullies.


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Appendix 2 Series 700 / 900 Road Pavements Bi tuminous Bound Materials

Appendix 2 Series 700/900 Road Pavements - Bituminous Bound Materials



Title of Sub Clauses Changes from original

SHW

Comments on changes

901 Bituminous

pavement materials

Significant changes.

See comments.

These were based on SHW (11/04)

edition, presenting amendment

(additional and substitute) clauses

on installation (transportation, laying

and compaction). The current SHW

(11/08) specifies these in Clause

903, where these details should be

considered

903SR Placing and

Compaction of

Bituminous Mixtures

Further details were

added.

Most of these details are contained

in BS 594987 (already referenced

by the current SHW). This clause,

903SR, also contains application for

footways however this should not be

part of Series 900 but to be covered

by Series 1100.

Revision to this clause is required to

accommodate recent best practice

for laying and to improve durability

911SR Hot Rolled

Asphalt (HRA) Surface

Course (Design

Mixtures)

There a number of

HRA variants which

are specified based on

either a conventional

Marshall Mixture

Design (MMD) and a

performance based

approach.

It is recommended that these two

design approaches are separated to

allow consistency with the current

SHW (11/08), specifically by

retaining that using MMD approach

within this clause but transferring

those with performance based

approach to Clause 943. The latter

will incorporate additional clauses toencompass the use of 30/14 and

55/14 HRA materials (note: the

current Clause 943 covers 35/14

HRA only).

918SR Slurry

Surfacing

Incorporating

Microsurfacing

This SR clause covers

application for

footways and

carriageways.

It is recommended that the former

should be excluded from Series 900

and transferred to Series 1100.

919SR Surface

Dressing: Recipe

There are some

repetitions regarding

ingredient materials

Additional references to TRL RN39

and the recent RSTA code of

practice should be added. Therefore


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SHW

Comments on changes

Specification (e.g. chipping

gradation and

properties); these can

be simplified.

revision to 919SR is required.

920SR Bituminous

sprays

See comments. These were outdated and based on

SHW (11/04) edition. The current

SHW (11/08) is sufficient.

921SR Surface

Macrotexture of

Bituminous Surface

Courses

This clause contains

specific requirements

from The County

Council.

Details in the current SHW (11/08)

should be sufficient for general use

and allow options to use

conventional method ofassessments and well as the

automated method adopted by The

County Council.

926SR In situ recycling

- the remix and repave

process

This clause introduces

in situ repair process.

This should be covered in the new

clause 951AR on Patching.

931SR Use of Rubber

in Materials

Provision on the use of

rubber in bituminous

mixtures.

This clause is now obsolete, making

a reference to Road Note 36 (1968).

This clause was allocated for RecipeMixtures: Heavy Duty Macadam

Base and Binder Course Macadams

with Paving Grade Bitumen (SHW

11/04) but now no longer in use

(since SHW 11/08). This material is

no longer in use hence may be

omitted.

937AR Stone mastic

asphalt used as

surface course

Introduce the use of

SMA in surface

course.

It may be better to address the use

of in Clause 972AR to avoid conflict

with the existing SHW.

942SR Thin Surface

Course Systems

Allowance to use

materials without BBA

HAPAS certificates.

Revision to the current SHW (11/08)

is required, to consider the new IAN

157/11 and the draft IAN 154

regarding the installation of this

material and the approval system

942SR Thin Surface

Course Systems

Surface integrity

guarantee has been

reduced to 3 years.

Consider the new IAN 157/11 and

the draft IAN 154 regarding the

installation of this material and the

approval system


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SHW

Comments on changes

945SR Weather

Conditions for Laying

of Hot Bituminous

Mixtures

It clearly presents

some details for rolled

asphalt application but

not so for other

materials.

An update is recommended.

959AR Bituminous

mixtures to BS EN

13108

Additional clause This clause makes reference to BS

EN 13108-1, 2, 4 and 5. These are

unnecessary duplicates of the

previous clauses. Therefore this

clause can be omitted.

959AR Resin basedcoloured surface

treatment

Additional clause This clause makes allowance tospecifying the use of this material for

lane demarcation.

960AR Use of slag

aggregate in

bituminous mixtures

Additional clause. This

clause prohibits the

use of blast furnace

and steel slag

aggregates in asphalt

mixtures.

This requirement is specific for the

Council. The use of these slag

aggregates is generally acceptable

provided that the aggregates meet

the requirements of Clause 901 and

the bituminous mixtures are properly

designed. Therefore this clause can

be omitted.

960AR Guide to use

slag aggregate in

asphalt mixtures.

Additional clause. This

clause prohibits the

use of slag aggregate

in low temperature

asphalt mixtures.

The reason behind this is unknown

and requires further considerations

by contacting the Council f or

discussion.

960AR Stress

absorbing membrane

interface (SAMI)

Additional clause This clause makes allowance to the

use of SAMI.

961AR Sand carpet

asphalt

Additional clause This clause specifies the use of

HRA 0/2F surf 70/100 with minimum

binder content of 10.8% (m/m).

Without more detailed information

about this clause it is not possible to

comment further.

961AR Stress

absorbing membrane

(SAM)

Additional clause This clause makes allowance to the

use of SAM.

962AR PSV

Requirements of

Additional clause This clause could have been

incorporated in the relevant clauses


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SHW

Comments on changes

Surface Course

Asphalt

of the respective surface course.

Therefore this clause can be omitted

963AR removal of

Existing Asphalt

Layers


incorporated in clause 902.

Therefore this clause can be

omitted.

964AR Surface

Preparation (Crack

Filling)


incorporated in clause 902.


omitted.

965AR Ironworks and

Drainage

Additional clause Consider adopting this clause, with

some modifications.

970SR Shaping

existing carriageway

(Bituminous Bound

Materials)

Additional clause This clause is about regulating layer

and it is better included in Clause

907.

970AR Compaction

control of asphalt

mixtures

Additional clause Broadly quoting BS 594987

practices. It may be better included

in the new Clause 903AR.

970AR 45% stone

content hot asphalt

surface course (for

hand laying)

Additional clause This clause allows the use of non-

standard HRA 45/XX type F 160/220

and is site specific. For simplicity,

this clause can be omitted.

970AR Intermediate

asphalt concrete

surface course

Additional clause This clause allows the use of non-

standard binder rich AC 20 close

surf 100/150 and is site specific. For

simplicity, this clause can be

omitted.

970AR Pre-patching

repairs to carriageway

using only surface

course materials

Additional clause It will be more appropriate to

consider this clause under the new

Clause 951SR (Patching).

971AR Stone Mastic

Asphalt Surface

Course

Additional clause This clause contains extracts from

BSI PD 6691 and BS 594987. An

update is required to accommodate

the most reference update on

Transport Scotland TS2010 (Ver2.0, 2012).


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SHW

Comments on changes

971AR Fine

Regulating Course

Additional clause This clause permits the use HRA

50/10 bin 40/60 only for regulating

layer. It is better placed in the new

Clause 907AR

972AR Cold in situ

recycled bitumen

stabilised base

Additional clause This clause is similar to SHW

Clause 948 but contained obsolete

BS. It may be better omitted and

new reference made to Clause 948.

972AR Surface

treatments -

application of grit toenhance early life

skidding resistance

Additional clause This concerns the use of coated and

non coated grit. It may be better

placed and/or incorporated in971AR.

973AR Cold in situ

recycled bitumen

stabilised base and

foamed bitumen

binder course - mixture

design and

characterisation




new reference made to Clause 948

973AR Compaction

Requirements

Additional clause It may be better included in the new

Clause 903AR.

974AR Foamed

bitumen bound binder

course




new reference made to Clause 948.

974AR Retread

process

Additional clause A reference can also be made to

DMRB HD31/94. An update to this

clause is recommended.

975AR Annex B BS

13108-1 Asphalt

Concrete Specification

Additional clause Similar to PD 6691. These are


previous/existing SHW clauses.


omitted.

975AR Surface

dressing

Additional clause It is about installation process.

These have been broadly covered

by previous clauses (919 and 922).


omitted.


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25


STANDARDISED SPECIFICTION AND STANDARD DETAILS

JUNE 2012


SHW

Comments on changes

976AR Annex C BS

13108-4 Hot rolled

asphalt Specification

Additional clause Similar to PD 6691. These are


previous/existing SHW clauses.


omitted.


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Appendix 3 Series 1100 - Footways and Paved Areas

Appendix 3 Series 1100 Footways and Paved Areas



Clause Reason for Variation Relevance

1101AR Kerbs,

Channels, Edgings

& Quadrants

(Note: this clause has been re-titled to

include stone kerbs and setts laid in

kerblines)

Sub Clause 1

Delete "C7.5 or mix ST1" and substitute

C12/15 or mix ST3"

Sub Clause 2

Insert at end Where kerbs are re-laid against

existing carriageway the kerbline shall be

sealed in accordance with clauses 1016 &

1017.

Sub Clause 3

Insert at end "For radii of 12m to 25m,

600mm long straight kerbs may be used. No

single kerb shall be less than 450mm long."

Add Sub Clause 6

The construction principles and practices set

out in sub clauses 1-5 above shall apply

equally to stone kerbs and setts laid in

kerblines, except that the tolerances for

longitudinal and vertical accuracy shall be

6mm along the top outer edge of the kerbs

to allow for local irregularities in shape.

Cannot find C7.5 or mix

ST1 in the original SHW.

Require clarification to

consider taking this

forward.

This sub clause is worth

taking forward as it ties in

sub clauses from other

SHW sections removing

any vagueness currently

associated with particular

tasks.


taking forward as it could

help other LHAs formalise

requirements.


taking forward as it might

help other LHAs when

using setts.

1104AR Footways

And Paved Areas

(Precast Concrete

Flags)

Clause 1104 para 2

Delete "Where permitted in Appendix 11/1 ...

+ 5 mm thick."; and

Substitute "450 x 450 mm small elemental

paving shall be laid on 100 mm thick grade

ST1 concrete base leaving 3 to 4 mm joints,

levelled using a rubber maul and dry silver

or silica jointing sand complying with Clause

1107AR brushed into joints for the full

depth."

Add additional paragraph.

5. Tactile paving is generally laid at

controlled crossings to delineate the position


taking forward as it is likely

to increase the stability of

small elemental paving for

longer. It would also help

other LHAs.

Tactile Paving is covered

in latter clauses. This text

will need to be reviewed in

conjunction with the other


JUNE 2012


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JUNE 2012


of the crossing for blind and partially sighted

people. It shall be laid to an exact pattern to

be specified by the Overseeing Organisation

for each individual site.

Flags shall be 450 x 450 x 70 mm with

domes or dimples protruding from the

uppermost surface and shall be red or buff in

colour. Domes shall have a height of 6 mm

and a diameter of 12 mm and shall number

approximately 49 per flag.

Flags shall be cut and laid to fit the contours

of the vehicular crossings and laid in

accordance with Clause 1104AR above.

clauses and merged as

necessary. This may end

up an AR to clause 1104

or a separate clause.

1104 Footways

And Paved Areas

(Precast Concrete

Slabs And Natural

Stone Flags)

Delete Sub Clause 2; and Substitute:

2. Slabs and flags shall be laid to the

crossfall detailed in Drawing No. LC.07a,

with transverse joints perpendicular to the

kerbline unless agreed otherwise with the

Project Manager. All longitudinal joints shall

be offset by a minimum of 150 mm except

where agreed with the Project Manager.

Slabs and flags shall be bedded on a

uniform 25mm thick layer of 1:15 dryPortland (CEM I) cement/bedding sand mix.

The bedding sand shall be clean sharp

sand, aggregate size 0/4 CP or 0/4 MP to

BS EN 13139. Where permitted by the

Project Manager as an alternative, slabs and

flags up to 450mm square may be bedded

on a layer of bedding sand 25mm +/- 10mm

thick. Bedding of slabs on 5 spot mortar is

not permitted.

Insert Sub Clauses 4 - 7

4. Joints between slabs and flags shall be

close, i.e. 2 to 4 mm in width. Joints shall be

grouted to within 2 to 3mm of the surface in

the following manner:

The surface of the slabs/flags shall be

watered. A site-mixed grout with a Portland

(CEM I) cement:sand ratio of 1:8 to 1:10

shall then be poured on to the surface and

brushed into the joints. The bedding sand

shall be clean sharp sand, aggregate size

0/4CP or 0/4MP to BS EN 13139. A dry


taking forward, though it

needs to be reviewed in

association with the similar

sub clause suggested in

1104AR above.

References to specific

LHA diagrams needs to be

removed and replacedwith MHA related

diagrams thus the MHA

diagram catalogue will

need to be reviewed. If a

diagram does not exist, a

decision will need to be

made on creating a new

diagram to share with

HMEP.

There is already a sub

clause 4 in the SHW.

There is no instruction to

delete the existing sub

clause, so the originating

LHA needs to clarify this

before it can be taken

forward.

Alternatively, if text does

not relate to the SHW text,

this sequence of sub

clauses can be


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JUNE 2012


1105AR Footways

And Paved Areas

(Flexible

Surfacing)

Add additional paragraph

4. The permitted tolerance for the finished

surface of footway binder course layers shallbe -6 mm to +0 mm. Sand asphalt and 6 mm

nominal sized asphalt concrete surface

course shall be laid 20 mm thick with a

permitted tolerance of - 0 to + 6 mm.


taking forward as it furtherspecifies relevant depths

and tolerances that can be

used by other LHAs.

1105 Footways

And Paved Areas

(Flexible

Surfacing)

Insert Sub Clause 4

4. The sealing of joints in surfacing or edges

of repairs shall be by painting of the vertical

face only (in accordance with Clause 901)

and shall not include overbanding or surface

applied sealing unless so directed by theProject Manager.


taking forward in parallel

to the above 1105AR. It

may be necessary to

renumber either of thesetwo sub clauses.

Overbanding is a topic of

contention across many

LHAs.

1106AR Footways

And Paved Areas

(In-Situ Concrete)

Delete paragraph 3. This SHW sub clause

needs to be reviewed. It

may appear to be sensible

for the majority of LHAs to

take it forward. However,

initial thoughts would be todismiss it.

1107AR Footways

And Paved Areas

(Concrete Block

Paving)

Add additional paragraph

4. Blocks shall be 200mm x 100mm x 80mm

thick with a chamfer or radius not exceeding

6mm. The wearing surface of each block

shall not be less than 85 per cent of the total

plan area of the block. The colour and

pattern of block paving shall be to that

specified by the Overseeing Organisation or,

in the case of patching work, shall matchexisting.

Sands for use in Laying Course (bedding

sand) and for jointing in clay or concrete

block pavements shall be naturally occurring

silica sands. Sands from quaternary

geological and sea dredged sands are

preferred; sands from crushed rock sources

shall not be used, except with the approval

of the Overseeing Organisation.

All sands used in block pavements shall be

essentially free from deleterious salts or


taking forward as it further

clarifies details around

using concrete blocks.

This might help other

LHAs that have not

specified to this detail

before.


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JUNE 2012


other contaminants.

Unless otherwise agreed by the Overseeing

Organisation, all laying course sand and allthe jointing sand delivered to any one site

shall each be from a single source.

The moisture content of laying course sand

shall be consistent and within ""1% of

optimum, as determined with BS1377 : Part

4 : 1990 : method 3.3.

The grading of the sands, as determined by

the washing and sieving method of BS EN

933-1:1997 (this replaces BS 812:Section

103.1 but BS812:Section 103.1 remainscurrent) shall be within the limits given

below:

BS sieve size Cat I Cat II C III Jointing

(BS 410) Sand

10 mm 100 100 100

5 mm 90-100 90-100 90-100

2.36 mm 75-100 75-100 75-100 100

1.18 mm - - - 95-100

600 Fm 35-60 35-60 35-70 55-100

300 Fm 8-35 8-35 8-35 15-50

150 Fm 0-10 0-10 0-10 0-15

75 Fm 0-0.1 0-1 0-3 0-3

Category I sites are pavements subject to

severely channelised traffic, docks,

harbours, bus stations, loading bays, aircraft

pavements, and the like.

Category II sites include adopted highways,

petrol station forecourts and pedestrian

precincts, car parks and footways subject to

some heavy vehicle loading.

Category III sites are those subject to little or

no heavy vehicular traffic, e.g. some

pedestrian areas, car parks, private drives

and footways.

Blocks shall be laid on a screeded layer ofsand having grading within the limits set in

the table above. Sand shall be laid to a


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compacted thickness of 50 mm. The blocks

shall be laid close together, being brought to

the laying face over the already laid work

and the whole area vibrated using a handguided rubber-based vibrating plate. Dry

silver or silica sand having a grading within

the limits of the table above shall be brushed

into the surface of the blocks and the area

vibrated several times until the joints are

completely filled with sand.

1110AR Frost

Susceptibility

1. Subject to the tolerances given in Table

7/1 and unless otherwise stated in Appendix

7/1, material shall not be frost susceptible if

it is used within 450mm of the designed finalsurface of a footway or paved area, or

350mm if the mean annual frost index of the

site is less than 50. Material shall be

classified as non-frost susceptible if the

mean heave is 15mm or less, when tested in

accordance with BS 812: Part 124: 1989

amended as given in Sub Clauses 801.7

and 801.8.


taking forward, though the

text will need to be

reviewed alongside theother Frost Susceptibility

related clauses.

References to Tables and

Appendices are LHA

specific, so the text may

need to be modified

accordingly.

1111AR Footways

And Paved Areas

(Hard LandscapeAreas)

1. Footways and paved areas in hard

landscaped areas shall be constructed in

accordance with the requirements inAppendix 11/01 and Appendix 11/70.

Appendix 11 will be

contract specific for a

single LHA and might bedifficult to take forward

without extracting the

appropriate text from the

Appendix.

1112AR Dressed

Natural Stone

Kerbs, Channels,

Quadrants And

Setts

1. Dressed natural stone kerbs, channels,

quadrants and setts shall comply with BS

EN 1342:2001 and also BS EN 1343:2001

and be of the type of igneous rock, finish

and size as described in Appendix 11/71.

Kerbs, channels and quadrants shall be laid,bedded and backed in compliance with

Clause 1101.1 and 1101.2. Unless

otherwise described in Appendix 11/71, setts

shall be laid, bedded and backed in class

C16/20 or ST4 concrete in accordance with

BS 8500-1:2006 and BS8500-2:2006. They

shall be laid on either a Mix ST4 concrete

foundation or on the base.

2. For curves of radius 12m or less, kerbs

and channels of appropriate radius shall be

used.

3. Individual kerbs, channels or quadrants

Appendix 11 will be

contract specific for a

single LHA and might be

difficult to take forward

without extracting the

appropriate text from theAppendix.

Curves >12m are covered

in another sub clause.

Consider appending this

text to that sub clause.


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shall not deviate by more than 3mm in 3m

from line and level. Setts shall be laid to a

flowing alignment.

1113AR Clay Brick

or Precast

Concrete Block

Kerbs, Channels

and Edgings

1. Clay bricks used for kerbs, channels and

edgings shall comply with BS EN 771-1 :

2003 and conform to the Class, size and

type described in Appendix 11/72. Precast

concrete blocks used for kerbs, channels

and edgings shall comply with BSEN 1338

and conform to the shapes, finish,

dimensions and colours described in

Appendix 11/72. They shall be laid and

bedded on a mortar designation (i) in

accordance with BS5628-3 Table 13 not lessthan 10mm and not more than 40mm thick,

on Mix ST4 concrete foundation or on the

base. Alternatively they may be laid and

bedded directly on Mix ST4 concrete

foundation whilst it is still plastic. Where

described in Appendix 11/72 clay brick or

precast concrete block kerbs, channels and

edgings shall be backed with Mix ST4

concrete.

2. For curves of radius 12m or less, kerbs,

channels and edgings shall be radially cuton both edges to the required line.

3.. Units of kerb, channel or edging shall not

deviate by more than 3mm in 3m from line

and level.


taking forward as it further

details the requirements

when laying clay bricks.

Appendix 11 is specific to

a single LHA. It may be

necessary to extract the

relevant text from the

Appendix.

Check with Clause 1108 to

see if it is a natural AR or

should remain separate.

This sub clause is a repeat

of one found in 1112ARabove.

This sub clause is a repeat

of one found in 1112AR

above. (Note: This sub

clause would need to be

renumbered).

1114AR Timber

Edging

1. Timber edging shall be constructed to the

requirements of Drawing Number K157.

Need to check if MHA

have an equivalentdrawing. If not, there may

be a case for a drawing to

be created and then

shared through HMEP.

Timber edging is

mentioned in a later

clause, which will need to

be reviewed in parallel and

merged with this sub

clause, if appropriate.

1115AR Footways

and Paved Areas

1. Slurry surfacing to footways and paved

areas shall be made and laid in compliance

These sub clauses need

to be reviewed in parallel


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(Slurry Surfacing) with Clause 918 and Appendix 11/73.

2. The colour and any other factors affecting

the design of the slurry surfacing are to be

as stated in Appendix 11/73.

to MHA (1170AR) and The

Council (1170AR &

1175AR) with a view to

merging.

Also, Appendix 11 is

proprietary to the LHA.

The appropriate text may

need to be extracted to

take this forward.

1116AR Bus

Shelters

1. The Council preferred style of Bus

Shelter installed throughout the County is

the Arun Style manufactured by

Queensbury, the Contractor shall note that

new installations will be installed as part of

the Maintenance Contract. If the contractor

wishes to use other shelters from different

manufacturers then they shall match in style

and colour the already installed shelters

throughout the Council.

2. The maintenance of glazing to the existing

shelters shall be undertaken by fully

qualified personnel for the style of shelter

throughout The Council glass sizes for

replacement shall be 8mm thick and cleartoughened to BS 6206. The glass is retained

horizontally with glass rails top and bottom,

and vertically with a one piece u-channel

extrusion. All fixings are allen key button

head stainless steel screws, which are

powder coated to match the framework.

3. Panels within the Enclosed Shelter and

Cantilevered Shelter have Glass with the

Council Logo and the sizes of these are

1393 x 1210 (enclosed) and 1393 x 916

(cantilevered). For exploded view of

Enclosed Shelter see Queensbury drawing

SK1080.

4. The contractor shall note that all

personnel replacing glass and maintaining

the existing shelters shall have the required

Street Works registration card for working on

the Highway.

5. All new bus shelters shall be as stated in

Appendix 11/74 and on the works order.

Although this sub clause is

specific to one LHA, it is

worth taking forward to

benefit others. LHAs

would probably like to

specify a particular style

and a repair/maintenance

regime for all bus shelters.

The MHA drawing

catalogue needs to be

reviewed for a similar

existing drawing. If no

drawing exists it might beappropriate to produce

one to be shared across

HMEP.

Appropriate training and

qualifications are

important. This sub clause

should be taken forward.

Appendix 11 will be

contract specific to a

particular LHA.

Appropriate text might

need to be extracted from

the Appendix to take

forward.


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1170AR Frost

Susceptibility

1. Material used within 450 mm of the

designed final footway or paved area

surface shall not be frost susceptible as

defined in the test method and procedure ofthe Transport Research Laboratory

Supplementary Report No SR 829.

Review this clause against

the other Frost

Susceptibility clauses from

other LHAs to see if thereis commonality and

therefore define common

text in an Additional

clause.

1170AR Natural

Stone Kerbs, Kerb

Setts, Channels,

Channel Setts,

Edging and Edging

Setts

1. Unless otherwise stated in Appendix

11/70 Natural Stone Kerbs, Kerb Setts,

Channels, Channel Setts, Edging and

Edging Setts shall comply with BS EN 1341

and the 1100 Series of the Specification for

Highway Works.

2. The types of Natural Stone Kerbs, Kerb

Setts, Channels, Channel Setts, Edging and

Edging Setts shall be as described in

Appendix 11/70.

Appendix 11 is proprietary

to a single contract with a

LHA. Extracting the

appropriate text from the

Appendix to be able to

take these sub clausesforward.

1170AR: Footway

Retread

1. Treat all emergent weeds, using

Glyphosate, 7 to 14 days prior to the retread

process and in accordance with

manufacturers instructions. Rake out and

remove all dead weeds, side back grass and

clear back overhanging vegetationimmediately prior to the retread process.

2. Areas of prior reconstruction (including

domestic and wheelchair footway crossings)

shall be constructed as shown in Drawing

LC.07a but excluding the surface course.

3. The position of all service covers shall be

referenced by marks made on adjacent

carriageway surfaces or by pegs or other

similar means. Areas of closely adjacent

ironwork or street furniture inaccessible to

the retread process plant shall be defined for

alternative treatment (see 13 below).

4. Scarify existing footway (including partially

reconstructed areas) using a mini cold

planer or similar approved method to a

depth of 6510mm. Manually rake over the

material to remove any individual pieces of

aggregate in excess of 50mm size.

5. At the direction of the Project Manager

any areas showing subgrade weakness shall

be strengthened by temporary removal of

the scarified layer, excavation of the existing

These sub clauses are

worth taking forward. This

sub clause needs to be

reviewed alongside that of

The Council 1175AR and

MHA 1170AR on SlurryResurfacing of Footways,

with a view to either

merging to a single AR or

keeping separate.

The MHA drawing

catalogue needs to review

to replace the LHA specific

reference within this sub

clause.


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sub-base and/or subgrade and replacement

with Granular Type 2 sub-base. The

removed scarified aggregate shall then be

replaced.

6. The scarified aggregate shall be shaped

and graded to the specified level and

crossfall allowing for the total specified depth

of surface course. Excess material shall be

removed, or relocated to positions requiring

'make-up'. In areas of aggregate deficit,

'make-up' shall be approved imported

planings or Granular Type 2 sub-base which

must be thoroughly mixed into existing

scarified material.

7. Compact the scarified layer using a twin

drum vibrating roller to a tolerance of 6mm

under a 3m straightedge and to achieve a

Clegg Impact Soil Tester value greater than

25.

8. Protect all covers, kerbs, edges and

private property by masking or other

approved method.

9. Apply K2-55 bitumen emulsion to thesurface at a uniform rate of 4.51.0 l/m.

10. Apply grade 2.8/6.3 sized dry stone

chippings (to BS EN 13043) to the surface at

a rate of spread of 7.00.5kg/m.

11. Lightly compact to effect full retention of

the chippings.

12. Adjust all service covers to finished

levels (see Appendix 5/72).

13. Inaccessible areas (see 3 above) shall

be broken out and replaced with a fully

compacted 40mm course of 20mm nominal

size open textured binder course.

14. The retreaded surface should remain

exposed for at least 24 hours and shall not

be surfaced over prior to approval by the

Project Manager.

15. Prior to laying the surface course apply

K1-40 bituminous emulsion tack coat at arate of 0.50.1l/m.

16. Apply asphalt concrete regulating course


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as directed.

17. Apply tack coat and 20mm depth of

0/6mm size close graded surface course(BS 4987-1 Clause 7.5 made with 160/220

pen bitumen). The surface course must be

laid within 3 weeks of the retread process on

any site.

18. All excess excavated material must be

removed from site daily unless it is likely to

be required as 'make-up' elsewhere, in

which case it shall be secured from

interference.

1170 AR Footway

Slurry Surfacing

Unless specified otherwise in the Package

Order the following shall apply:

SPECIFICATION

1. GENERAL DESCRIPTION

1.1 This Specification deals with the

provision and laying of slurry surfacing

materials (6.0mm nominal layer thickness

and over) on footway and other areas notsubject to regular traffic other than private

vehicular access.

2. DESCRIPTION OF WORKS

2.1 The following processes are to be

included and quantities recorded for items

(c) and (j).

(a) Preparatory sweeping and pressure jet

washing;

(b) Weedkilling and weed treatment;

(c) Preliminary regulating of surfaces;

(d) Protection and masking of ironwork and

street furniture;

(e) Applying surfacing including any tack

coat if required by the process;

(f) Rolling of surfaces if required by the

process;

(g) Protection of newly treated surface;

These sub clauses are

worth taking forward and

combined with those from

The Council (1115AR) &

The Council (1170AR &

1175AR) on Footway

Retread/Slurry sealing.


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(h) Sweeping of loose materials;

(i) Provision of signs for carrying out traffic

control, and informing frontagers;

(j) Resetting of Ironwork.

3. TYPE OF BINDER

3.1 Materials manufactured with bitumen

emulsion or modified bitumen emulsions

complying with the appropriate British

Standards where they exist.

4. PERIOD OF WORK

4.1 It is should be judged if weather

conditions and other circumstances are

suitable before carrying out the work.

5. PREPARATORY SWEEPING AND

CLEANING

5.1 All vegetation within the surface to be

covered shall be treated with an approved

herbicide not less than 14 days before the

application of the surfacing.

5.2 Immediately before application of the

surfacing all loose material from the surface

to be covered shall be removed (this is to be

accomplished by high pressure jet washing)

and any remaining vegetation still growing

moved, with any remaining root growth

treated with 2,4D.

Note: the application of 2,4D shall be made

after high pressure jet washing has taken

place.

5.3 The removal of any foreign matter

affecting the surface which is likely to prove

detrimental to the finished product is also

deemed to be included as part of the

preparatory cleaning e.g. oils spillage or any

substance likely to de-bond the layer to be

applied.

6. PROTECTION OF STREET FURNITURE

6.1 The full width and length of the area to

be treated shall be covered withoutoverlapping kerbs, channels and edgings for


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footways.

6.2 The material shall not be allowed to

overlap on to boundary walls fences or anyother structure adjoining the highway nor

any street furniture actually situated within

the areas to be treated. All ironwork such as

manhole covers, hydrants, gullies, catchpit

covers, stop valves or similar shall be

masked to give complete protection during

the operation. Oils, and/or sand or similar

materials shall not be used.

7. RESETTING COVERS AND FRAMES

7.1 Where practicable, gullies and manholecovers and frames, stop valves and all other

covers shall be set to new levels before the

final surfacing is laid.

7.2 When covers etc., are set to new levels

after the surfacing is laid, the reinstatement

of the area around the covers etc., shall be

carried out in the same type of material as

that used for the new surfacing. Covers shall

be set to the new levels within two weeks of

the completion of the surface.

7.3 Manholes etc., shall be reset flush (+

3mm) with, and the gullies 6mm (+ 3mm)

below, the level of the new surface.

8. JOINTS

8.1 Longitudinal joints shall be feather

lapped such that the joints do not exceed the

nominal layer thickness, longitudinally or

laterally. Joints with adjacent surfaces shall

be feathered to neat regular shapesappropriate to the layout, and protective

mats or paper should be used to achieve

same. Wherever possible longitudinal joints

between final applications shall coincide with

lane lines. In every case, surfacing of the

highest part of the substrate due to crossfall

or camber will always be treated last thereby

ensuring that the upper layer of the feather

lap at joints will be so formed to shed water

towards the lower section of surface.


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9. AGGREGATES

9.1 The final surface shall consist of

exposed rock aggregate with a minimum psvof 45.

10. MIXING AND LAYING

10.1 The material shall be properly

proportioned and shall be mixed by a

machine which shall be able to supply

sufficient material to achieve the nominal

layer thickness and surface regularity

required.

10.2 The surfacing mixtures shall be spreaduniformly by means of mechanical spreader

or by hand.

10.3 All material discharged from the mixer

shall be used without further addition.

10.5 Where more than one layer is

necessary each successive layer shall be

completed where possible within three days

of completion of the previous layer. Where

other than full machine width passes are

necessary these shall not form the final partof the surfacing.

10.6 It is recognised that in some areas

laying by mechanical means may not be

possible.

10.7 All equipment shall be limited to

weights which will not cause damage to

substrates.

11. FINISHED SURFACE

11.1 The finished surfacing shall be of

uniform surface texture and appearance

throughout the work, without variations

across the width of the paved area.

11.2 The finished surfacing shall be free

from droppings, excess overlapping or badly

aligned longitudinal or transverse joints,

damage by rain or frost, or other defects.

Any surfacing which does not comply with

this Clause, or is non-uniform in surface

texture or appearance within 30 days of

laying shall be made good by removal and


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replacement of fresh material.

11.3 If fresh material is superimposed any

area so treated shall be not less than 5mlong and the full width of the machine. The

completed repair shall meet the overall

requirements of this Specification and shall

match the original material. In areas of

restricted access hand work may be

necessary but it is essential that a finish is

achieved compatible with that of the

mechanically laid material.

12. PERFORMANCE STANDARDS

12.1 Surface Regularity

No irregularity greater than 8mm under a 1m

straight edge shall be measured at any

location unless such a profile is required to

accommodate features such as dropped

kerbs, cambers and changing gradients.

12.2 Slip Resistance

The finished surface shall provide an

average slip resistance of at least 0.35 Grip

Number when measured in push mode overany 10m length with a Grip Tester currently

manufactured by Findlay, Irvine Ltd.,

Penicuik, Midlothian.

12.3 Abrasion Loss

If the effects of normal traffic and/or

weathering cause abrasion of the slurry

surfacing so as to completely reveal the

underlying original footway surface, this

condition is defined as Total Abrasion Loss.

Remedial works shall be carried out to any

single area of total abrasion loss when it

exceeds 1.0m2.

12.4 Penetration Resistance

The slurry surfacing shall, at all natural

ambient temperatures, be capable of

supporting pedestrians wearing narrow

heeled shoes without undue penetration of

the surface. Objective assessment of any

such defects shall be carried out as follows:the method of road surface hardness

measurement published in Appendix C of


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TRL Road Note 39 Design Guide for Road

Surface Dressing (1992) shall be used with

the following modifications. The standard

4mm diameter tip shall be converted to a15mm diameter flat-ended tip using a

suitable converter, as available from the

probe manufacturers, SME Machine Tools

Ltd, Chapel Works, Sheffield Road,

Sheepbridge, Chesterfield, Derbyshire.

Measurements shall be made at a surface

temperature of 30C +2 without the use of

correction factors or graphs. Slurry

surfacing shall be regarded as unacceptably

soft if the main probe penetration exceeds

10mm.

13. PROTECTION OF NEWLY LAID

SURFACE

13.1 Traffic and pedestrians shall be kept off

newly treated surfaces until material has set

and will suffer to detrimental effect.

14. NOTICE TO CARRY OUT WORK

14.1 Clear and legible notices are to be

posted in the road where work is to becarried out giving at least 24 hours notice of

working being carried out.

14.2 The owners/occupiers of all properties

fronting the footway to be surfaced shall be

notified 24 hours before works are due to

commence, by means of the 3 CAP

Highways information leaflet.

15. TRAFFIC SAFETY MEASURES AND

CONTROL

15.1 Traffic control shall be in accordance

with the Code of Practice for Signing at

Surface Dressing Sites (produced jointly by

CSS and RSDA -CCS/RSDA /Eng/3/2000)

and such other special requirements as

described in the contract.

Reference to a particular

Grip Tester should be

changed to one that

complies with a particularBS or BSEN, or check

HAPAS or other

accreditation status of it

and make relevant

reference.

Reference to SME

Machine Tools should be

removed/revised.

1171AR Footways

And Paved Areas

(Stone Flags)

1. Natural Yorkstone Flags vary in thickness

and so shall be individually fully bedded on

mortar. Joints shall be no greater than 20

mm and shall be completely buttered, filled

and pointed with sand/cement mortar 3:1.

Where overriding of the footways occurs or

where specified by the Overseeing

It is worth taking this sub

clause forward as it might

apply to other LHAs

specifying the use of

specific surfacing.

Reference to Instarmac

should be replaced with


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Organisation flags shall be laid on 100 mm

grade ST1 concrete and levelled using a

rubber maul.

Alternatively proprietary mortar may be

instructed (Instarmac or similar approved).

2. Second hand Yorkstone flags may be

provided by the Overseeing Organisation.

3. On occasion the Employer may request

that circular work where the radius is 12 m

or less all flags shall be radially cut on both

edges.

reference to HAPAS

approved materials.

Reuse of materials is

worth taking forward.

This sub clause should be

merged with the previous

sub clauses related to

curves > 12m.

1171AR: FootwayAnd Paved Areas

(Gravel Footpaths

& Timber Edgings)

1. Self-setting gravel surfacing shall beBreedon Golden Amber Gravel as supplied

by Messrs. Breedon and Cloud Lime Works

Ltd., or a similar approved material. The

gravel shall be evenly spread and

compacted by 8 passes of a 700-1300 kg

per metre width, pedestrian controlled dead

weight roller and have a finished thickness

of 50mm. Further compaction shall be

carried out applying water to the rollers, until

a well-bonded surface finish is obtained to

the satisfaction of the Project Manager. Anyareas where segregation occurs shall be

blinded with fine material and re-rolled. The

surface shall be allowed to dry before being

trafficked.

2. Timber edging and supporting stakes

shall be band sawn, knot free softwood

which shall be certified to have been

pressure creosoted with a net retention of

creosote in the timber of not less than 160kg

per cubic metre. Edgings shall either be

fixed and supported by wood stakes or laidand bedded in concrete class ST3 as shown

on the Drawings.

It is worth taking these subclauses forward, though

they may need to be split

into a Gravel AR and a

Timber Edging AR, with

the latter merged with

1114AR above. Remove /

amend (as appropriate)

reference to specific

supplier.

Timber edging is already

part of a previous sub

clause. The sub clauses

need to be combined.

1171 AR Footway

And Paved Areas

(Flexible

Surfacing)

Unless specified otherwise in the Package

Order the following shall apply:

General

1. Flexible surfacings shall be laid to levels

and crossfalls as agreed with the

Overseeing Organisation and materials shall

be laid in accordance with the appropriate

Clauses in the 700, 800, 900 and 1100

This sub clause has the

same title as 1105.

These sub clauses need

to be reviewed against

1105 and 1105AR to

either create an AR to

clause 1105 or keep

separate with an


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Series and comply with the following:-

Sub-base

2. Granular sub-base material in footways

and paved areas shall be Type 1 granular

material and comply with the requirements

of Clause 803 or Class 6F3 granular fill

(planings, etc) to comply with the

requirements in Table 6/1. In situ concrete

sub-base material in footways and paved

areas shall be Mix ST1 concrete and comply

with the requirements of Clause 2602. Sub-

base material shall be laid to the thickness

as described in the Contract.

Asphalt Concrete Binder Course

3. Binder course shall be 20mm maximum

size aggregate dense binder course

complying with the requirements of BS EN

13108-1 with paving grade bitumen, grade

160/220, laid to the thickness as described

in the Contract.

Asphalt Concrete Surface Course

4. Surface course shall be 6mm maximumsize aggregate dense surface course

complying with the requirements of BS EN

13108-1 with paving grade bitumen, grade

160/220, laid to the thickness as described

in the Contract.

Hot Rolled Asphalt Surface Course

5. Surface course shall be 14mm maximum

size aggregate hot rolled asphalt surface

course complying with the requirements of

BS EN 13108-4 with paving grade bitumen,

grade 40/60, type F mixture, designation

55/14F, laid to the thickness as described in

the contract.

Sand Asphalt Surface Course

6. Surface course shall be 2mm maximum

size aggregate hot rolled asphalt surface

course complying with the requirements of

BS EN 13108-4 with paving grade bitumen,

grade 40/60, type F mixture, designationO/2F, laid to the thickness as described in

the Contract.

amendment to the title.

Tables would need to be

extracted and included in

the sub clause.


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Regulating Course

7. Regulating course material shall be made

and laid in accordance with the requirementsfor one or other of the surface course or

binder course materials as described in the

Contract.

Limestone and Basalt Aggregate in Surface

Course

8. The use of limestone and basalt

aggregate in the surface course will not be

permitted.

1172AR FootwaysAnd Paved Areas

(Stone Setts)

1. Stone setts shall be set with lengths atright angles to the street and well rammed

as they are laid. They shall be laid in

regular, straight and properly bonded

courses from side to side with close joints

(12 to 15 mm) which must be kept perfectly

clear to receive the bitumen and cement

grouts. The joints shall be racked with

clean, dry, single sized 10 mm gritstone

chippings and grouted with hot bitumen (50

pen) to within 25 mm of the top of the joints.

The remainder of the depth shall be filledwith 3:1 sand/cement mortar and flush

pointed.

2. Second hand stone setts may be provided

by the Overseeing Organisation. Second

hand stone setts shall be sorted by the

Contractor to comply with the bonding

requirements in 1 above.

3. Where stone setts are to be laid in hard

margins, the chippings and hot bitumen

grout shall be replaced with semi-dry 3:1sand/cement mortar.

4. Second hand stone setts can be of either

Yorkstone or granite and shall be laid to a

pattern specified by the Overseeing

Organisation. The pattern of work adjacent

to gullies chambers and other obstructions

shall be agreed with the Overseeing

Organisatio