Autoclaved Aerated Concrete (AAC)

AAC Introduction

In 1914 the Swedes formulated a mixture of cement, lime, water and sand that expanded due to aeration upon addition of aluminum powder. A material like wood but without the disadvantages of combustibility, decay and termite damage was obtained. The material was further developed to what we know today as Autoclaved Aerated Concrete (AAC).

Autoclaved Aerated Concrete (AAC) is a fully integrated building system of panels and blocks that are used for residential, commercial and industrial buildings. AAC, a light-weight green building material, is fire resistant and has good thermal insulation, solid structure and is easy to work with. AAC is manufactured by about 200 plants in 35 countries. AAC has been produced for more than 70 years, and it offers several significant advantages over other cement construction materials, one of the most important being its lower environmental impact.

Product Description

AAC is a highly thermally insulating concrete-based material used for both internal and external construction. Besides AAC's insulating capability, one of its advantages in construction is its quick and easy installation, because the material can be routed, sanded, or cut to size on site using standard carbon steel power tools.


PARAMETER AAC BLOCK CLAY BRICKS CLC BLOCKS
Size 600mm X 200mm X 100-300mm 230mm X 115mm X 75mm 600mm X 200mm X 100-300mm
Precession in size Variation 1.5mm (+/-) Variation 5mm (+/-) Variation 3mm (+/-)
Compressive Strength 30-40 kg/cm2 25-30 kg/cm3 20-25 kg/cm3
Dry Density 551 - 650 kg/m3 1950 kg/m3 800 - 1000 kg/m3 (oven dry)
Wet Density Approx 800 - 850 kg Approx 2400kg Approx 1200 - 1500 kg
Wastage Up to 5% Up to 20% Up to 10%
Baking Done in autoclave with high pressure steam ready in 12 Hours Done in clay klins Done in open sun, only ready in 25 days
Fire Resistance Up to 6 Hours for 200mm thickness 2 Hours 2 Hours
Sound Reduction (DB) 45 for 200mm Thick Wall 50 for 230mm Thick Wall 50 for 200mm Thick Wall
Thermal Conductivity Approx 0.16 - 0.25 Approx 0.81 Approx 0.70
Surface Quality (Fungus Problem) None Smooth Clean Finish with no Fungus Fungus and salinity problems on the surface Same on AAC Blocks
Adaption to various surface finish Smoother Surface Result in better coating application Inconsistent Surface Same
Morter Consumption 0.018/m3 with 1:6/0.5 Bag of Cement 0.1/m3 with 1:6/1.35 Bag of Cement 0.025/m3 with 1:6/ 1.5 Bag of Cement
Construction Time Reduction by upto 50% Compared to Clay Bricks Double AAC Blocks Reduction by upto 30% Compared to Clay Bricks
Energy Saving 32% (APP) Air condition load both heating & Cooling will come down No Saving Up to 20% Saving
Cost Benefit Factor Dead Load Reduce Structural Cost No Saving Less Then AAC
Construction to Carpet Area 2-3% Saving No Saving No Saving
Chemical Composition Fly Ash Used min 50% which reacts with (lime & Cement) to form AAC which is an intert material Soil is used which contains many inorganic impurities like sulphate ETC. which results in elderscarce Fly and Used