RAW MATERIAL

RAW MATERIAL REQUIREMENT

Description
Specification
Fly Ash:
The Fly Ash used to manufacture Fly Ash Bricks shall conform to Grade I or Grade II as per IS 3812:1981.  SiO2  >= 40%,  Al2O3 15 ~ 35%, SO3 >= 2%, Loss on Ignition <= 12%.
50-60%

Sand:
Sand used to manufacture Fly Ash Bricks shall conform to IS 1542:1992. Sand should be medium coarse duly sieved and free from any impurity like Stones, Grass Roots, Gravel.
25-40%
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Stone Dust: 
Stone Dust is subsidiary raw material of sand where sand is available at very costly price.
25-40%
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Cement:
Ordinary Portland Cement - 53 Grade (OPC - 53).
5-8%
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Lime :      
  

     
: Hydrated Lime as per IS: 712: 1984 or Sludge lime (By-product of acetylene Gas Plant). 10-12%
Gypsum:
:Chemical & Mineral Gypsum. Gypsum should be free of lumps and having purity to the about 60 %.  The purity of Gypsum can be tested by testing method specified in IS : 1288 : 1982
2 - 5%