Comparison of CLC


S. No.
Parameters Cellular Lightweight Concrete Bricks

 

Autoclaved Aerated Concrete Blocks Concrete/Hollow Concrete Blocks Burnt Clay Bricks
1. Basic raw materials & other inputs Cement, Sand, Aggregate, Fly Ash, Water & Foaming Compound Cement, Sand, Fly Ash & Acration Compound Cement, Sand & Aggregate Top Soil & Energy
2. General Properties
Dry Density kg/m3 400 800-1000 1200-1800 650 750 1200-2400 1900
Compressive Strength in kg/cm3 20-30 (Grade A) 40-60 (Grade B) 125-180 (Grade C) 35 40 30-60 40-125
Range of applications / utility Insulation Partition Reinforced elements Non-load bearing blocks Reinforced panels Non-load Bearing Walls Load-bearing & non-load bearing
Aging Gains strength with age No gain in strength with age No gain in strength with age No gain in strength with age
Thermal Conductivity (W/m.k.) 0.132-0.151 for 800 kg/m3

0.238 for 1000 kg/m3

0.132-0.151 for 650 kg/m3 0.184
Sound Insulation Superior than burnt clay & hollow concrete Superior than burnt clay & hollow concrete Good Normal
Ease of Working Can be cut, nailed & drilled Can be cut, nailed & drilled Difficult to work Normal
3. Shape & Form
Pre-cast Brick size 600 x 200 x 100/200 mm 600 x 200 x 100/200 mm 400 x 400 x 100/200 mm 230 x 100 x 70 mm
Pre-cast elements Any size of elements Any size of elements Not feasible Not feasible
Cast in shape Any shape & size in any density Not feasible Not feasible Not feasible
4. Water Absorption % by weight 12% for 800 kg/m3 density (by volume)

7.5% for 1800 kg/m3 density

45% by volume 20% by volume 20% by volume
5. Drying Shrinkage mm/meter 0.05 Grade A

0.10 Grade B

Shrinkage after maturing

0.011 (for 1200 kg/m3)

0.058 (for kg/m3)

0.07 (M-25 Concrete) No shrinkage
6. Productivity Output 100% more than brick work Output 100% more than brick work 50% higher than brick Normal
7. Eco Friendliness Pollution free

Least energy requriement

Can consume fly ash around 33%

Pollution free

High energy requirement

Open process uses fly ash

Medium energy

No smoke

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

Marginal dead weight reduction No additional saving