CIVIL SNAPS – CONCRETE TECHNOLOGY
Chemical composition of cement
CaO |
Controls strength and soundness | 60 – 65% |
SiO2 |
Strength, excess causes slow setting |
16 – 25% |
Al2O3 |
Quick setting, excess causes low strength | 3 – 8% |
Fe2O3 |
Gives colour and fusion of different ingredients |
0.5 – 0.6% |
MgO |
Imparts colour and hardness, excess causes cracks | 1 – 3% |
Alkalies |
Excess causes efflorescence and cracking |
Traces |
CIVIL SNAPS – CONCRETE TECHNOLOGY
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