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 technology |
Technological Comparison
| Basic Raw Material |
Agricultural soil, coal or wood for firing |
Cement, sand, fly ash, lime & aggregates |
Cement, sand , fly ash, foam & water |
| Production Process and Setup |
Kilns |
Mobile or Stationary plant |
On-site Production |
| Dry Density kg/m3 |
1800-2000 |
1900-2100 |
300-600/ 800-1000 /1200-1800 |
| Compressive Strength kg/cm2 |
30-80 |
30-150 |
4-10 / 25-35 / 125-250 |
| Applications |
Load bearing & Non-load bearings |
Load bearing & Non-load bearings walls |
Thermal insulation, Partitions, Load & Non-load bearings |
| Pre cast block size |
229*114*70 mm |
400*200*200/100 mm |
600*300*100/150/200 |
| Cast-in place |
Not- Feasible |
Not-Feasible |
Any shape, any size, any density |
| Compaction during production |
Yes |
Yes |
None |
| Aging |
No |
Yes |
Gain strength with age |
| Thermal Conductivity W/mK |
0.7 |
1.1 |
0.16 for 500 kg/m3
0.21 for 800 kg/m3
0.28 for 1000 kg/m3 |
| Sound Insulation |
Normal |
Better |
Superior |
| Ease of working |
Normal |
Difficult |
Can be cut, sawn, nailed, drilled |
| Eco Friendliness |
Process creates smoke, uses high energy, wasting agricultural lands |
Low energy, No smoke |
Pollution free, Green product, Least energy, Reuse of Industrial wastes |
Popular applications
Thermal Insulation:
Foam concrete of density between 250 - 550 kg/m3 is primarily used for thermal insulation or fire protection. It uses only cement (or with a small proportion of sand), water and foam and can easily be pumped into moulds of varying orientations.
Void Filling:
Foam concrete of density between 600 - 800 kg/m3 is used for void-filling, such as in landscaping (above/underground construction), filling voids behind archways and refurbishing damaged sewage systems, as well as producing masonry units.
Block Production:
Foam concrete of density ranging from 800 to 900 kg/m3 is primarily used in the production of blocks and other non-load bearing building elements such as balcony railings, partitions, parapets, etc.
Precast Walls & Floor Screeds:
Foam concrete of density ranging from 1100 - 1400 kg/m3 are commonly used in prefabricated and cast in place walls, either load-bearing or non-load bearing. It can also be successfully used for floor screeds.
Load Bearing & Slabs:
Foam concrete of density between 1600 - 1800 kg/m3 would be recommended for slabs and other load-bearing building elements where higher strength is obligatory.
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