Compare AAC

S. No.ParametersAutoclaved Aerated Concrete BlocksBurnt Clay Bricks
1.Basic raw materials & other inputsCement, Fly Ash & Acration CompoundTop Soil & Energy
2.General Properties  
 Dry Density kg/m36001900
 Compressive Strength in kg/cm34040-75
 Range of applications / utilityNon-load bearing blocksLoad-bearing & non-load bearing
 AgingNo gain in strength with ageNo gain in strength with age
 Thermal Conductivity (W/m.k.)0.132-0.151 for 600 kg/m30.184
 Sound InsulationSuperior than burnt clay & hollow concreteNormal
 Ease of WorkingCan be cut, nailed & drilledNormal
3.Shape & Form  
 Pre-cast Brick size600 x 200 x 100/150/200 mm230 x 100 x 70 mm
 Pre-cast elementsAny size of elementsNot feasible
 Cast in shapeNot feasibleNot feasible
4.Water Absorption % by weight45% by volume20% by volume
5.Drying Shrinkage mm/meterShrinkage after maturing0.011 (for 600 kg/m3) 0.058 (for kg/m3)No shrinkage
6.ProductivityOutput 100% more than brick workNormal
7.Eco FriendlinessPollution freeHigh energy requirement Open process uses fly ashCreates smokeUses high energy Wastes agricultural land
8.Structural saving due to dead weight reduction55% reduction in weight of walls. Tremendous structural saving for high rise buildings in Earthquake / Poor soil areaNo additional saving