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8/18/2019 Hollow Concrete Block

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HOLLOW BLOCK

BHAVESH PETHANI (13BCL083)

DHRUV PRAJAPATI (13BCL084)

HITESH PRAJAPATI (13BCL085)

ABHISHEK SHARMA (13BCL104)

SUSTAINABLE BUILDING TECHNOLOGY


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History• The first hollow concrete b

1890 by Harmon S. Pa

States. After 10 years of ex

patented the design in 19were 8 in (20.3 cm) by 10

(76.2 cm), and they were s

be lifted into place with a s

an estimated 1,500

manufacturing concrete b

States.

• These early blocks were uand the average output w

per person per hour. To

manufacturing is a highly

that can produce up to 2,00


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A h o llo w m as o n r ydefined as having

cross-sectional area

plane, parallel to the

surface, less thp e r c e n t of the gros

sectional area in th

plane

DEFINITION


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MATERIALS USED


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(1)Proportioning

(2)Mixing (4)Curing

(3)Compacting


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Types of machinery used


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Type of machinery used


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1

2

3

4

5

SIZE

Cavities

1. 100× 200 × 400

2. 200× 200 × 400

The total width of the cavity in a

the face of the block as laid in w

surface will be at right angles to

shall not exceed 65% of the total Shell Thickness

The shell thickness of blocks shall not be less

than 40 mm for sizes A & B and 20 mm for other

sizes. JointsThe end of the blocks, which form

may be plain rectangle and groov

grooved.Aggregates• Passes through IS sieve 1285mm

• 15% should retained on IS sieve 10 mm and 10-

40% on IS sieve 4.75 mm

Quality Specific


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1

2

3

4

5

Density

Crushing Strength

The block density hollow concrete block shall

not be richer than 1600 kgs. Per cubic meter of

gross volume.

The average crushing strength o

immersed in water maintaining a

for a period of 24 hrs bedded with

shall be not less than 50 kg pe

area.

Drying Shrinkage

The drying shrinkage of average of three blocks

when unrestrained shall not exceed 0.004 per

cent. Moisture contentsThe moisture content (average of

blocks on being immersed in w

0.03 %.Water Absorption

The water absorption (av. 3 blocks)

shall not exceed 240 kg per cu meter.


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Method of bui


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Corner bonding


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Estimating Data

Blocks

There are 121 ⁄ 2 blocks in every square meter of wall surface area.

Mortar

1m3 of mortar is required for approximately 800

blocks.

For a 1:1:6 mortar mix, the approximate quantities

required for 1m3 of mortar are:

6 bags cement

6 bags lime

1.2 m3 of damp sand (allowing 20% bulking)

Grout

Approximate quantities for filling concrete blocks

and elements:


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HOLLOW BLOCK

RETAINING WALLS

COLUMNS

COMPOUND WALLS

USES

In view of their vers

properties, hollow concr

demand by depa

engaged in construction

Housing Boards and Urb

Corporations, Road Tran

and Forest Departments.


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Some Creative Uses of HCB


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LIFE CYCLE ANALYSIS Steps4 steps

1. goal and scope

2. Life cycle inventory

3. Life cycle impact analysis

4. Interpretation of the

results.

One square meter of partition wall system is chose

consumption and materials are based on this functio

CO2e/m2 etc.

The values

impacts are 6

/m2 and 0.018

wall values a

CO2 /m2 an

respectively, r

6% of total emb

LCI is a technical, data-based proces

and raw material requirements, a

waterborne emissions, solid waste,

the entire life cycle of a product ,proc

EE: (Embodied Energy)

GWP: (Global Warming Po

AP: (Acidification Potential)


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EMBODIED ENERGY

THE BENEFITS OF HOLLOW


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1

2

3

4

5

Economy in design of sub-structure due to reduction of loadsSaving in mortar for lying of blocks as compared to ordinary brick work. Saving in

Uniform Plaster thickness of 12 mm can be maintained due to precision o

compared to brick work where plaster thickness of average 20 mm is required

even plastered surface due to variations in the sizes of bricks.

Insulation of walls is achieved due to cavity, which provides

all times. Similarly hollowness results in sound insulation

Paint on finished walls can be applied due to cavity, which

saving for all times. Similarly hollowness results in sound insu

No problem of the appearance of salts. Hence, grea

maintenance of final finishes to the walls.


CONCRETE BLOCK:-



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1

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3

4

5

Laying of Blocks is much quicker as compared to brickwork

saving in time.

Thermal insulation property of hollow concrete block is more

ordinary brick wall.

Hollow concrete block is environmentally eco friendly.

Factor of safety of hollow concrete block is more than brick m

Maintenance cost of the hollow concrete block is less than br


CONCRETE BLOCK:-


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DISADVANTAGE• Rising Damp: When groun

wall from the base and migrat

• Cracking: Often due to shrin

or movement of the wall.

• Efflorescence: Occurs whe

salt are carried to the surface

through the masonry.


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1

2

3

4

5

The dead load of hollow concrete block is much lesser tha

due to this, one can work with the structural engineer anconsumption in construction.

Hollow concrete blocks require minimal mortar.

If these blocks are engineered properly then dimensional a

finishing quality is obtained

Usage of lintel blocks brings tremendous operational efficie

lower cost.

Hollow concrete blocks have additives to improve their wat

seepage minimization

Why to use HCB??


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1

2

3

4

5

Hollow concrete blocks can be engineered to achieve very h

strengths.

Hollow concrete blocks are much more sturdy.

The hollow concrete block adopt to modern design forms

texture etc.

Minimum maintenance cost and cost competitiveness with ot

it a preferred material for today’s building.

Hollow concrete blocks can effectively be used for cold sto

go downs as they are thermally effective.

Why to use HCB??


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C SE STUDY

SPRING FIELD ohio

The house is a 1,300

square foot, single-story

structure. The house has

concrete masonry

exterior walls, a wood-

framed floor deck over a

crawl space, and wood-

framed interior walls and

roof trusses.

BRICK MASONRY AND HOLLOW CONCRETE BLOCK-A COMPARISIO


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BRICK MASONRY AND HOLLOW CONCRETE BLOCK A COMPARISIO

Ahmad et.al

• Materials used

1. Cement:

Khyber ordinary Portland cement of 43 grade confining to IS 8112:1989 wa

the work .

2. Sand:

Sand used throughout the work comprised of plane river sand with maxim

confining to zone II as per IS 383-1970 with specific gravity of 2.6.

3. Hollow Concrete Blocks:

Hollow concrete blocks of size (16x8x8) inch and (8x8x8) inch were used for m

4. Bricks:

Bricks were used of modular size (22.5x10x7.5) cm.

5. Mortar:

1:4 cement sand mortar as used for wall masonry were made in the sta

prescribed by IS: 3535-1986

E C t bi t f b i k t t b R 3875


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Economy: Cost per cubic meter of brick masonry comes out to be Rs.3875

cubic meter of brick masonry comes out to be Rs.3290. The cost of block wall

hollow concrete masonry came out to be 17.78%less than that of brick w

masonry was economical than brick masonry.


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CONCLUSION


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• CONCLUSION

Compressive strength of the brick units and brick masonry wall came out

compressive strength of HCB units and hollow concrete wall masonry.

Sound insulation property of hollow concrete masonry was more than that of

Thermal insulation property of hollow concrete masonry was more than that

due to presence of air in hollow concrete units.

As the cost of block walls per meter cube of masonry comes out to be lesser

walls. Block masonry is economical than brick masonry.Maintenance cost of HCB masonry is less than brick masonry because

found as it is found in brick masonry wall.

•


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Conclusion of Presentation

1. Being light in weight HCBs provide economy in design of sub-structurof the loads.

2. Laying of blocks saves mortar as compared with ordinary brick work.

mortar plaster work too.

3. Cavity of blocks helps achieving insulation of walls and provides ener

times. Hollowness results in sound insulation.

4. There is no problem of appearance of salts thereby saving in maintenfinishes to the walls.

5. Laying of blocks is much quicker as compared to brick work hence, s

6. HCBs are environmentally eco-friendly.

7. Factor of safety HCB masonry is more than brick masonry.


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REFERENCEwww.ecologicbuilding.com

www.rockyhollowblocks.com

www.ustudy.inwww.researchpublish.com


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Thank YOU..