AAC Aspects

For a world facing threats of a global warming crisis, prominence and growing value of green projects along with growing importance of lesser carbon footprints, AAC becomes a sustainable construction solution for a greener tomorrow.

 

COST IMPACT ANALYSIS COMPARE TO BRICKS

Cost Component

Saving in Component

Estimated Inpact on Project Cost

Mortar Material

60%

1%

Clave Blocks are 9 times the size of conventional bricks, resulting in 1/3rd the number of joints. This is an overall 60% of mortar savings.

Plastering Material

35%

1.5%

Exceptional dimensional accuracy & smooth surfaces eliminate the need of three-coat plaster walls and allows for a final 6 mm skin coat (putty/gypsum plaster).

Wastage

12%

1%

Breakage in bricks might be as high as 15% which in case of AAC blocks, in negligible.

Structural Material (Steel & Concrete)

15%

7%

Being light weight, AAC blocks drastically reduce the dead weight of the building. This translates to design of lighter structures leading to reduction in steel and concrete (up to 15%).

Increase in Floor space area

2%

4%

Due to exceptional thermal insulation & weather barrier properties, it's possible to use thinner blocks, which result in increased carpet areas.

Saving in Capex for HVAC Systems

30%

0.5%

AAC blakcs have excellent insulation properties, which results in saving in capex and opex of HVAC Systems.

Total Impact on Project Cost 15%

GENERAL ASPECTS

Parameter

AAC Block

Clay Brick

Structural Cost

Steel saving up to 15%

No such saving

Energy Saving

Approximately 30% reduction in air-conditioned load for both heating and cooling

No such saving

Maintenance

Less due to its superior properties

Comparatively high

Construction Speed

Speedy construction due to its big size, light weight and ease to cut in any size or shape

Comparatively low

Labour Output

Approximately double of conventional bricks

Comparatively low

Efflorescence

No such chance, which improves the durability of wall along with plaster and paint in a long run

Most chances are there

Fitting and Chasing

All kind of fitting and chasing possible (as per IS:1905)

All kind of fitting/chasing is possible

Carpet Area

More due to lesser thickness of the partition walls

Comparatively low

Storage

Readily available at any time in any season on short notice, hence no storage required

Particularly in monsoon, on-site stock is required, which blocks larger working spaces

Water Required

Requires less water in wetting and curing, hence reducing electricity bills and labour costs.

Needs more curing resulting in higher amount of electricity bills and labour costs

Cement Mortar for Plaster and Masonry

Requires less material due to flat, even surfaces and lesser number of joints

Requires more material due to irregular surface and greater number of joints

Breakage @ Utilization

Negligible breakage makes almost 100% utilization is possible

Average 10% to 12% breakage, making 100% utilization impossible

TECHNICAL SPECIFICATIONS

Particulars

AAC Block

Clay Brick

Size (LxHxB)

625mm x 240mm x 75mm - 300mm

230mm x 75mm x 115mm

Precision in Size

Variation 1.00 (+/-)

Variation 2.15 (+/-)

Compressive Strength

3 - 4.0 N/mm2 (As per IS:2185 part III)

2.5 - 3.0 N/mm2

Dry Density

550-650 kg/m3 (Oven dry)

1800 Kg/m3

Fire Resistance

2 to 6 hours depending on thickness

2 hours

Sound Reduction index 1(dB)

45 for 200 mm thick wall

50 for 230 ,, thick wall

Thermal Conductivity. (Kw-m/C)

0.16

0.81

Mortar Consumption M3 with 1:6

0.5 bag of Cement

1.35 bag of Cement

Construction Time per mason

30 Sqm

20 Sqm

Chemical Composition

Fly ash used around 70% which reacts with binders (Lime and Cement) to form AAC

Soil is used which contains many inorganis impurities like sulfates etc. resulting in Efflorescende

Finishing

Can be directly cut or haped/sculptured as required

Not possible

Contribution to carpet area

3 - 5 %

No contribution