Chemicals
|
Composition
|
Function
|
|
1
|
Lime (CaO)
|
60 -65%
|
Controls strength and soundness
|
2
|
Silica (SiO2)
|
17- 25%
|
Gives Strength, excess causes slow
Setting
|
3
|
Alumina (Al2O3)
|
3 - 8%
|
Responsible for quick setting, excess lowers strength
|
4
|
Iron Oxide
(Fe2O3)
|
0.5 - 6%
|
Gives color and fusion of different
ingredients at high temp
|
5
|
Magnesia (MgO)
|
0.1 - 4%
|
Imparts color and hardness, excess
Magnesia causes cracks
|
6
|
Alkalies
|
Traces
|
Excess cause efflorescence and cracking
|
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