S.NO. | PARAMETERS | AUTOCLAVED AERATED CONCRETE BLOCKS | CELLULAR LIGHTWEIGHT CONCRETE BLOCKS | BURNT CLAY BRICKS |
1. | Basic raw materials & other inputs | Cement, Sand/PFA, High Quality Lime, Gypsum, Water & alluminium as aerating Compound | Cement, Aggregate, Fly Ash, Water & Foam chemical Compound | Top Soil & Energy |
2. | General Properties |
| Dry Density kg/m3 | 650-750 | 750 – 800 | 1900 |
| Compressive Strength in kg/cm3 | 30-40 | 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 |
| Process | Casting –rising –pre curing | Casting –Rising-conventional curing | Moulding-heat treatment. |
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 | Less than 20% 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, normal energy requirement, Open process uses fly ash or sand-lime | 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 |
9. | Delivery | Pre-Cured and ready for delivery | Conventional curing required. Not ready for delivery in post production. | Seasonal. |
10. | Automization | Automated manufacturing process- accurate design mix | Semi automization | Manual |
very informative..
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