Comparision between AAC and CLC

Comparison between AAC and CLC

S. No.	Parameters	Autoclaved Aerated Concrete Blocks	Cellular Lightweight Concrete Blocks	Burnt Clay Bricks
1.	Basic raw materials & other inputs	Cement, Fly Ash, Lime  and Gypsum	Cement, Aggregate, Fly Ash, Water & Foaming Compound	Top Soil & Energy
2.	General Properties
	Dry Density kg/m3	600	750 – 800	1900
	Compressive Strength in kg/cm3	40	25 – 30	40-75
	Range of applications / utility	Non-load bearing blocks	Partition	Load-bearing & non-load bearing
	Aging	No gain in strength with age	Gains strength with age	No gain in strength with age
	Thermal Conductivity (W/m.k.)	0.132-0.151 for 600 kg/m3	0.132-0.151 for 800 kg/m3	0.184
	Sound Insulation	Superior than burnt clay & hollow concrete	Superior than burnt clay & hollow concrete	Normal
	Ease of Working	Can be cut, nailed & drilled	Can be cut, nailed & drilled	Normal
3.	Shape & Form
	Pre-cast Brick size	600 x 200 x 100/150/200 mm	600 x 200 x 100/150/200 mm	230 x 100 x 70 mm
	Pre-cast elements	Any size of elements	Any size of elements	Not feasible
	Cast in shape	Not feasible	Any shape & size in any density	Not feasible
4.	Water Absorption % by weight	45% by volume	12% for 800 kg/m3 density (by volume)	20% by volume
5.	Drying Shrinkage mm/meter	Shrinkage after maturing0.011 (for 600 kg/m3) 0.058 (for kg/m3)	0.10	No shrinkage
6.	Productivity	Output 100% more than brick work	Output 100% more than brick work	Normal
7.	Eco Friendliness	Pollution free, High energy requirement, Open process uses fly ash	Pollution free, Least energy requriement, Can consume fly ash around 33%	Creates smoke, Uses high energy, Wastes agricultural land
8.	Structural saving due to dead weight reduction	55% reduction in weight of walls. Tremendous structural saving for high rise buildings in Earthquake / Poor soil area	55% reduction in weight of walls. Tremendous structural saving for high rise buildings in Earthquake / Poor soil area	No additional saving