Autoclaved Aerated Concrete or AAC is a steam-cured cementitous product manufactured from a mix of pulverized fly ash, cement, lime, gypsum and an aeration agent, giving it its unique porous nature. AAC is an intelligent building solutions system because of its light weight, excellent thermal insulation and acoustic properties and energy efficiency.
1:6 Cement mortar or 1:1:5 in Cement fly ash mortar of 10 mm thick for both vertical and horizontal joints.
The LEED Green Building Rating System is a nationally and internationally accepted benchmark for the design, construction and operation of high performance green buildings. IGBC LEED-INDIA promotes a whole-building approach to sustainability by recognizing performance in the following areas:
- Sustainable Site (SS)
- Water Efficiency (WE)
- Energy and Atmosphere (EA)
- Materials and Resources (MR)
- Indoor Environmental Quality (IEQ)
- Innovation in Design (ID)
- Regional Priority
Increase in Carpet Area– With the use of KONCRETE AAC Blocks, the wall width can be optimized to create 2-8 % additional valuable floor space. More so, with reduction in dead load on structure due to light weight, the sizes of structural elements can be optimized to minimize wall thickness and create additional floor space.
Saving in Steel– Steel is one of the major components of construction activity. So the amount of steel used depends on the load to be taken by the building, the dead weight of the structure and the super structure is also taken into consideration in the calculation of the steel requirement. The amount of steel used in construction by taking red bricks into consideration is approximately 2.5 to 2.75 Kg/Sqft of built up area. The steel usage comes down to 2.25 Kg/Sqft by using AAC. That is a saving of almost 25% in construction steel resulting in cost saving of almost Rs. 12 to 15 of saving in construction cost.
Saving in Mortar– The bricks or blocks are used in walls and walls are mostly plastered with cement / sand mortar, the dimensions of the bricks/blocks play a very crucial role in determining the quantum of plastering material used. AAC Blocks are 5-6 times bigger than Red Clay Bricks resulting saving in plastering.
Saving in Foundation Cost– Due to AAC block’s light weight, it saves the foundation cost and helps the mason.
Rapid construction– One solid AAC Block of 60 x 20 cm (24 x 8”) is equivalent in area to approx. 6 standard bricks of 7.1 x 24 cm (2.84 x 9.6”) yet less than 1/5 the weight, leading to fast laying. Using thin-set mortar in 2 mm (1/16”) joints avoids the time consuming handling and mixing of conventional mortar.
Easy piping and cabling – Installation of plumbing pipes in kitchens, bathrooms for water and sewage can easily and manually be cut into the AAC wall, faster than in any other block work. Wires will be installed in grooves easily cut with a manual chasing tool. Services, such as pipes and cables can be installed after walls are ready.
Low shrinkage – Installation of plumbing pipes in kitchens, bathrooms for water and sewage can easily and manually be cut into the AAC wall, faster than in any other block work. Wires will be installed in grooves easily cut with a manual chasing tool. Services, such as pipes and cables can be installed after walls are ready.
Design Flexibility– AAC Blocks are available in various sizes, can cover the same area as up to 12 Red Clay bricks and by using thinner blocks (6” instead of 9” partition wall) leads to an increased carpet area between 3-5%.
|Parameter||KONCRETE AAC Blocks||Conventional Clay Bricks|
|Production Facility||State-of-the-art factory facility, Fully automatic & highly consistency.||Unhealthy working conditions due to toxic gases.|
|Size||600 mm x 200 mm x 100-300 mm||225 mm x 100 mm x 65 mm|
|Variation in Size||1.5 mm (+/-)||1.5 mm (+/-)|
|Compressive Strength||3.5-4 N/m2||2.5-3 N/m2|
|Dry Density||550-700 kg/m3||1800 kg/ m3|
|Fire Resistance (8â€³ wall)||Up to 7 hours||Around 2 hours|
|Cost Benefit||Reduction in dead weight leading to savings in steel and concrete.||None|
|Energy Saving||Approximately 30% for heating and cooling.||None|
|Water usage in Construction||Low as water needs only for surface wetting before use.||High as water needs for curing before use.|
|Soil Consumption||Uses fly ash which is a thermal power plant waste product & thus no consumption of top soil.||One sq ft of carpet area with clay brick walling will consume 25.5 kg of top soil.|
|Fuel Consumption||One sq ft of carpet area with AAC blocks will consume 1 kg of coal.||One sq ft of carpet area with clay bricks will consume 8 kg of coal.|
|CO2 Emission||One sq ft of carpet area will emit 2.2 kg of CO2.||One sq ft of carpet area will emit 17.6 kg of CO2.|
|Earthquake Resistance||Conformance to requirement of Seismic zone IV & V.||Conditional Conformance.|
|Termites & Pest Resistance||High||Low|
|Additional Floor Space||2-8% additional space can be achieved.||No Contribution|
|Workability||EASY. Can be used to create arches, curves etc.||Difficult|
|Labour||Organized sector with proper HR practices||Unorganized sector with rampant use of child labour.|