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Special Micro-surfacing applications W13 session
APWA 2013 Annual meeting,
Jacksonville, FL
Contents
Definition of Microsurfacing technology;
Formulations
Fields of application;
Gap Graded formulations
Utilization of Synthetics fibers
Crack relief system with using Microsurfacing:
Heavy duty Crack relief system using Microsurfacing
Colored microsurfacing
Futurs developments
Definition of Microsurfacing technology
Definitions of Microsurfacing technologies
The microsurfacing material is special cold mixture applied atultra-thin thickness of 7 à 15 mm (1/4 to ½”), as surface layer,to intend of friction adherence and to seal the existing surface.
A maintenance Technique� Preventive :
To prevent some future superficial degradations of the surface pavement.
� Corrective : To correct superficial degradations of a surface pavement
MicrosurfacingDefinitions of the constituents
1. Aggregates
2. Mineral Filler
3. Bitumen Emulsion
4. Water
5. Fibers(depending of the application)
MicrosurfacingCriteria of selection – Speed of the intervention
Aggregates FillerWater additives
Emulsion
Mix
Spreader box
Direction
Mixing time15 to 45 sec
Brown Mix and homogeneous
Black mat
Setting time2 to 10 minutes
Opening to traffic between 30 - 60 minutes
.Setting time 10 minutes
.Time for traffic opening < 60 minutes
MicrosurfacingDefinitions - Production
Mobil unit machine
o Transportation of the constituents
o Storage of the constituents
o Dosage of the constituents
o Mixing of the constituents
Application by a spreader box with variable width Continuous Unit
Traditional Unit Semitrailer Unit
Congrès Bitume Québec- 31 mars 2011 - page 8
Mobil Unit •Storage•Dosage
Spreader box•Mixing and - laying
Microsurfacing
Speed of application :8000 to 25 000 sy² per day
MicrosurfacingDefinitions - Production
Microsurfacing Formulation study
Mixing and setting time tests
• Allow to determine the compatibilty between the components
• Determination of the mixing time and setting time.
Cohesion test
• Benedict cohesion tester: application of a torque on a sample through a rubberdisk with a charge of 200 kPa.
• Cohesion mesured on Microsurfacing samples at differents curing time (30, 60and 90 minutes)
Microsurfacing Formulation study
Testing after curing
Wet Track abrasion test (WTAT)
o Determination of the abrasion resistance of the mixture (in fonction ofthe bitumen content)o Simulation of abrasion from the vehicules tires (curves)o Determination of the minimum bitumen contant
Load wheel tester (LWT) – Bleeding susceptibility
o Determination of the maximum bitumen content where risks of bleedingappears
Microsurfacing Formulation study
Wet track abrasion test (WTAT)
Microsurfacing Formulation study
Wet track abrasion test (WTAT)
Microsurfacing Formulation study
Load wheel tester (LWT)
Microsurfacing Formulation study
Specifics performances testso Lateral displacement whit LWT for rutting correction application
Microsurfacing Formulation study
Specifics performance tests
o Schulze-Breuer compatibility
Grade Point Abrasion (g) Integrity % retenu
Adhesion% enrobage
A 4 0 – 0.7 90 – 100 90 – 100
B 3 0.7 – 1.0 75 – 90 75 – 90
C 2 1.0 – 1.3 50 – 75 50 – 75
D 1 1.3 – 2.0 10 - 50 10 -50
Microsurfacing Formulation study
Fields of application
MicrosurfacingField of application
Wearing course, maintenance or new pavements
(highways, urban and rural streets, residentials)
Bicycle lanes, Parkings
Cape Seal : Chips seal + Microsurfacing
Dangerous zones ‘’accidents’’
(Gap graded formulation)
Colored surfaces
MicrosurfacingSelection Criterias
Security and noise efficiencyReduction of aggregates loss (in comparison of chips seal)No bleedingLess noisy
Service lifeLong term skid resistanceTrafficable at early age
EstheticImprovement with circulation (joints)Possibilty of Coloration
Preparation worksNo milling required (ruts less than ¾ inch)No tack coat required
Works durationReopening to the traffic very fastLess traffic interruption
MicrosurfacingSelection Criterias
PavementCondition
Time (Years)
Slurry Seal Micro-
Surfacing
Chip Seal
Hot-In Place /
Cold-In Place
Mill & Overlay
Reconstruction
REDUCE
RECYCLE
RE-USE
“The Right Product, On the Right Road, At The Right Time”
FDRCape Seal
Note: Selection of product is very dependent on existing surface deterioration and traffic requirements.
MicrosurfacingSelection Criterias
MicrosurfacingLimits of application
Unefficient (single layer) against crack reflection
No reprofiling and reinforcement effects
Consider the pavement structure capacity
Double application always better
MicrosurfacingPreparation and intervention
Support preparation
Deformations and defects survey
Treatment in fonction of the support condition
Structural deficienciesCorrection before microsurfacing application
Superficials defects: stripping / raveling
Corrections of deformations of the supports withoutshowing any structural deficiencies
Microsurfacing interventions = Number of layers in function of the déformations
MicrosurfacingPreparation and intervention
Choice of treatment in function of Ruttingdeformation:
Deformation less than ¼ inch;
Deformation between ¼ and ¾ inch;
Deformation more than ¾ inch
MicrosurfacingPreparation and intervention
Deformation less than ¼ inch;
Crack filling of cracks over 1/4 inchPreparation of the supportCleaning of the surfaceMicrosurfacing application:
Double layers (always better)Or single application if the support have no deformation
MicrosurfacingPreparation and intervention
Protection of the utilities (covers, joints)
Drains covers protected by papers or plastic film
MicrosurfacingPreparation and intervention
Existing Markings:
Stripping of thermolastic markings
Emulsion application over paint markings
MicrosurfacingPreparation and intervention
Cleaning of the surface:
Sweeping of the surface to remove any debris
Water projection if necessary
MicrosurfacingPreparation and intervention
Application of the Microsurfacing (deformation < ¼ inch ):
A first correction layer of 5 to 8 kg/m² ( 9 to 14 lb/sy) « Scratch coat »
A final application of ± 10 kg/m² (18 lb/sy)
Steel edge
Full width
MicrosurfacingPreparation and intervention
Application of the Microsurfacing (deformation between¼ to ¾ inch) :
Cleaning of the surfacePreparation of the supportRut filling with microsurfacingDouble application of Microsurfacing (always better) or single
applicationScratch coat 5 to 8 kg/m² ( 9 to 14 lb/sy)
Wearing course ± 10 kg/m² (18 lb/sy)
MicrosurfacingPreparation and intervention
Ruts filling with microsurfacing;
In condition of:
Presence of wearing;The ruts deformation are stabilizedThe support have a good enough structural capacityNo alligator cracks
The ruts have to be fill with adapted microsurfacing mix formulation
MicrosurfacingPreparation and intervention
Ruts filling with Microsurfacing
The Rutting box
MicrosurfacingDefinitions – Rates of application
ISSA A-143 Rate of application Québec
Type II Type III Type 1 et type 2
Suggered rates of application (Kg/m²)Without ruts fill 6 to 11 Kg/m²
11 to 20 lb/sy8 to 16 kg/m²9 to 30 lb/sy
8 to 12
MicrosurfacingRecommanded Rates of application from ISSA
Rate of application(Type III only)
(For every mm of microsurfacing mix, add 3 to 5 mm as a crown to allow for compaction under traffic)
Ruts depth
12 - 19 mm 11 to 16 kg/m²
19 - 25 mm 14 to 19 kg/m²
25 - 32mm 15 to 21 kg/m²
32 - 38 mm 17 to 22 kg/m²
Rate of application(Type III only)
(For every inch of microsurfacing mix, add 0.125 in to 0.25 in as a crown to allow for compaction under traffic)
Ruts depth
0.5 – 0.75 inch 20 to 30 lb/yd²
0.75 – 1.00 inch 25 to 35 lb/yd²
1.00 – 1.25 inch 28 to 38 lb/yd²
1.25 – 1.50 inch 32 to 40 lb/yd²
MicrosurfacingPreparation and intervention
Application of Microsurfacing (deformation > ¾ inch ):
Reprofiling with cold milling or micro milling;Cleaning of the surface;Double application of microsurfaing:
Scracth coat of 5 to 8 kg/m² (9 to 14 lb/sy;
Wearing course of ± 10 kg/m² (18 lb/sy)
Gap Graded formulations
Components of Gap graded micro-surfacing
Binder : PMA emulsion
Aggregates: Gap-Graded gradation
Selected Fibers
Type of fibers
Dosing of fibers
Effect of fibers on the mix
The very dense fiber network significantly modifies the rheological behaviorof the mix, giving short and long-term benefits.
The addition of fibers increases the apparent viscosity of the mix. Theapparent viscosity increases by a factor of ten. This fibers network avoid anysegregation in the spreader box, allowing the use of special Gap gradedgradation.
Microsurfacing with Gap graded gradation
Aggregate : Example of gradation and quality tests
TEST TEST METHOD SPECIFICATION Value
Sand equivalent Value of soils
and fine aggregates
ASTM D2419 65 % minimum 66%
CPP (Polissing Coefficient by
projection) � PVN
LC 21-102 0.45 0.56
Resistance to degradation in
Micro-deval machine
LS 609 16 % 8.5%
0
10
20
30
40
50
60
70
80
90
100
0.01 0.1 1 10
Sieves (mm)
Pas
sing
(%)
ISSA Type III gradation
0
10
20
30
40
50
60
70
80
90
100
0.01 0.1 1 10Sieves (mm)
Pas
sing
(%)
Gap graded 0-6 mm
Microsurfacing with Gap graded gradation
Surface characteristics
Macro-texture, average texture depth, Sand patch test (initial)
0/6 ATD around 0.8 mm
0/10 ATD > 1 mm
Skid resistance (initial)
BFC at 40km/h > 0,50
BFC at 120km/h > 0,35
BPN > 0.70
Higher the grading, higher the BFC
Microsurfacing with Gap graded gradation
A Gripfibre® 0/10 has been laid on a section of A71 highway (2 km).
Braking-force coefficient has been measured after 6 and 18 months.
GripfibreGripfibreGripfibreGripfibre®®®® productproductproductproduct
0.1
0.2
0.3
0.4
0.5
0.6
0.7
40 50 60 70 80 90 100 110 120
Bra
kin
g-f
orc
e c
oe
ffic
ien
t (B
FC
)
Speed (km/h)
Evolution of braking-force coefficient on motorway A71 after 6 and 18 months of service
BFC after 6 months on slow lane
BFC after 18 months on slow lane
BFC after 6 months on fast lane
BFC after 18 months on fast lane
Upper and bottom thresholds
measured on national roads
High skid resistance microsurfacing mixHigh skid resistance microsurfacing mix
The use of synthetic fibers:
Synthetic organic fibers
0.1 to 0.2% in relation to aggregates
Thin and long (4 to 6 mm)
Several million of fibres per m²
Pretreated for a better dispersion
Use of a Fiber Cutter system
Laying made easier
Against segregation and trickles
Improved performances
Allow gap-graded formulas to be used
Ensure a better long lasting skid resistance
Microsurfacing with Gap graded gradation
Fibers specially designed dosing unit:
Ready to use Fibers
Microsurfacing with Gap graded gradation
A143 Recommended performance guideline:
Microsurfacing with Gap graded gradation
Synthetic organic fibers
0.1 to 0.2% in relation to aggregates
Thin and long (4 to 6 mm)
Several million of fibres per m²
Laying made easier
Against segregation and trickles
Improved performances
Allow gap-graded formulas to be used
Ensure a better long lasting skid resistance
Microsurfacing with Gap graded gradation
Résults Requir.
mixing time at 25 °C (sec) 210 120 min
setting time (min) 13 -
Résults Requir.cohesion at 30min (Kg.cm) 15 12 mincohesion at 60min (kg.cm) 22 20 min
Preblended aggregatesPortland cementPremix waterretarderEmulplast EC (04-2)
Résults Requir. 1hour soak (g/m2) 257 538 max 6 days soak (g/m2) 691 807 max Asphalt content (based on aggregates)
OTHER TESTSRésults Requir. Résults Requir.
Excess Asphalt by LWT (g/m2) 257 538 max Specific gravity after 1000 cycles of 57 kg 1,978 2,10 maxWet Stripping (%) 95 + 90 min Classification Compatibility BAA AAA ou BAALateral Displacement (%) N/A 5 max
4 - 6mm - selecteg aggregates - New-Brunswick
0-2mm - selecteg aggregates - New-Brunswick
MIXING - CONSOLIDATION
WET COHESION
WET TRACK ABRASION LOSS
AGGREGATES
MIX DESIGN AT 20°C (Based on aggregates)
MIX FORMULATION
Microsurfacing with Gap graded gradation
Synthetics Fibers
Modifications proposal:4.2 Aggregate
4.2.3 Gradation
Microsurfacing with Gap graded gradation
0
10
20
30
40
50
60
70
80
90
100
0.01 0.1 1 10
Sieves (mm)
Passing (%)
Gap graded TYPE IV
Microsurfacing with Gap graded gradation
Recommandations:
The rut fill have to be realized with type III mix;
Recommandation to always realized a type III scratch coat before
the application of Type IV mix wearing course;
The fibers dosing unit have to be specially designed to this
application;
Aggregates gradation for gap-graded mix:
Blend of 0 -1/8 and 1 /4 - 3/8:
Microsurfacing with Gap graded gradation
Crack relief system with using
Microsurfacing
Hot applied Membrane + Fibrous microsurfacing
Crack inhibitor system FLEXIPLAST®
Support fissuré
Nouvelle couche de roulement
} Flexiplast
• Very efficient system against crack rising type :
• Thermal shrinkage
• Longitudinals, transversals
• polygonals
• Efficient System on every kind of support, without structural weakness.
• Support Waterproofing effect.
• Good bonding between HMA layers.
Crack relief system FLEXIPLAST®
New wearing course
Cracked support
Crack relief system FLEXIPLAST®
-5°C, after > 320 000 cycles, no
crack rising,
-Horizontal displacement 24 µm
-Vertical displacement 19 µm
+ 5°C, after >178 000 cycles, no
crack rising,
-Horizontal displacement 111 µm
-Vertical displacement 18 µm
Crack inhibitor system FLEXIPLAST®
- Comparison of systems efficiencies at -5°C
Colored microsurfacing
Red colored
Conventional bitumen emulsion
Aggregates (pink porphyre)
Iron oxide pigment
COLORED MICRO-SURFACINGS
RD 14 Cazouls-les Béziers (34), in 2005
Red colored
COLORED MICRO-SURFACINGS
Footpaths in Zénith – Clermont Ferrand (63) – 2004
Red colored
COLORED MICRO-SURFACINGS
Red colored
COLORED MICRO-SURFACINGS
Microsurfacing before Abrasion test Microsurfacing after Abrasion test
Private property access – Sigogne (16)
Beige
Use of synthetic binder emulsion
COLORED MICRO-SURFACINGS
Green
Use of synthetic binder emulsion or Conventional emulsion
COLORED MICRO-SURFACINGS
Green colored
COLORED MICRO-SURFACINGS
Microsurfacing before Abrasion test Microsurfacing after Abrasion test
Orange
Synthetic emulsion
Selected aggregates
Iron oxide
COLORED MICRO-SURFACINGS
Futurs developments
Use of synthetic binder (colored mix)
Special formultion for ruts filling
Use of recycling asphalt pavement RAP as aggregate
50-75% of RAP
Less emulsion
FUTURS DEVELOPMENTS
Janvier 2011 - page 65
Thanks for your attention