About AAC

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.

AAC today is considered a revolutionary precast building material offering a unique combination of high durability and strength, low weight, unprecedented build ability and superior ecological green features. This material is a state of the art green building material which is in other parts of the country fast replacing ordinary red clay bricks and fly ash bricks for its superior quality and saving potentials in the first and revenue maintenance cost of building. The blocks and panels are used for all kinds of walls, external or internal, load bearing or non-load bearing walls etc. AAC is the material of choice for all building applications.
Autoclaved Aerated Concrete technology was invented by a Swedish scientist Mr. John Axel Ericson during 1920s. However, it took a long time for the invention to be commercially viable and to be in wide use in a developing economy like INDIA. However, AAC blocks are widely used in Europe, Middle East, South East Asia, China and USA.

Knowledge Center:

What is AAC?
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.
Is AAC a new building material?
Autoclaved Aerated Concrete technology was invented by a Swedish scientist Mr. John Axel Ericson during 1920s. However, it took a long time for the invention to be commercially viable and to be in wide use in a developing economy like INDIA. However, AAC blocks are widely used in Europe, Middle East, South East Asia, China and USA.
What type of mortar is used with AAC?

1:6 Cement mortar or 1:1:5 in Cement fly ash mortar of 10 mm thick for both vertical and horizontal joints.

How durable is AAC in various climates?
Autoclaved aerated concrete is extremely durable. It does not rot or decay like wood or other organic materials dose not rust like metal. Termites and other pests cannot cause damage to it. AAC is not combustible. The millions of tiny pores in MC cushion the building, prevent progressive collapse.
Why are AAC Blocks “Green” Building Material?
 
The production process of AAC Blocks uses fly ash which is a byproduct in thermal power plants. Conventional bricks need fertile top soil. Therefore use of AAC Blocks as alternative to red bricks prevents needless erosion of fertile top soil. Also, the production process of AAC Blocks is very energy efficient and emits very Less CO2. AAC Blocks are recyclable. Usage of AAC Blocks significantly reduces electrical expenses due to reduced HVAC (Heating, Ventilation and Air Conditioning) toad, qualifying it to be a “Green” building material.
What exterior finishes is suitable for AAC?
AAC can be finished with brick, stone, stucco, wood /vinyl siding or any other standard finish, as per recommendation of the architect.
 
What are the lead-times for supply of AAC blocks?
AAC blocks are dispatched within 2-3 working days after confirmation of order. There is no seasonal variation in supplies.

 

What is LEED rating of IGBC-INDIA?

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

 


SAVINGS

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%.

 


 

Comparison:

ParameterKONCRETE AAC BlocksConventional Clay Bricks
Production FacilityState-of-the-art factory facility, Fully automatic & highly consistency.Unhealthy working conditions due to toxic gases.
Size600 mm x 200 mm x 100-300 mm225 mm x 100 mm x 65 mm
Variation in Size1.5 mm (+/-)1.5 mm (+/-)
Compressive Strength3.5-4 N/m22.5-3 N/m2
Dry Density550-700 kg/m31800 kg/ m3
Fire Resistance (8″ wall)Up to 7 hoursAround 2 hours
Cost BenefitReduction in dead weight leading to savings in steel and concrete.None
Energy SavingApproximately 30% for heating and cooling.None
Water usage in ConstructionLow as water needs only for surface wetting before use.High as water needs for curing before use.
Soil ConsumptionUses 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 ConsumptionOne 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 EmissionOne 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 ResistanceConformance to requirement of Seismic zone IV & V.Conditional Conformance.
Termites & Pest ResistanceHighLow
Additional Floor Space2-8% additional space can be achieved.No Contribution
WorkabilityEASY. Can be used to create arches, curves etc.Difficult
LabourOrganized sector with proper HR practicesUnorganized sector with rampant use of child labour.