Chemical Composition Of Cement with their Percentage and Functions | Raw Materials Of Cement

1. Lime ( Calcium Oxide ) 

✍ Quantity of Lime(calcium oxide) in Cement in Percentage / Composition ( % ) = 60-65%
✍ Function :-
- Lime Controls Strength of the Cement
- Lime also controls Soundness of cement

Less Lime in Cement :-
- Less amount of lime in cement Reduce the strength of cement.
- Also it reduce Setting time of cement.

Excess Of Lime in Cement :-
- Excess of lime in cement cause of Unsoundness of cement.

2. Silica ( Silicon Oxide )

✍ Quantity of Silica(silicon oxide) in cement in percentage / Composition ( % ) = 17-25%
✍ Function :-
- Silica gives Strength of Cement.

Excess Of Silica in Cement :-
- Excess of silica in cement is the cause of slow setting.

3. Alumina ( Aluminum Oxide )

✍ Quantity of Alumina(aluminum oxide) in cement in percentage / Composition ( % ) = 3-8%
✍ Function :-
- Responsible for Quick setting.

Excess of Alumina in Cement :-
- it lowers the strength

4. Iron Oxide 

✍ Quantity of Iron oxide in cement in percentage / Composition ( % ) = 0.5-6%
✍ Function :-
- Iron Oxide gives Colour to Cement.
- Iron oxide acts as a flux.

5. Magnesia ( Magnesium Oxide )

✍ Quantity of Magnesia(magnesium oxide) in cement in percentage / Composition ( % ) = 0.5-4%

✍ Function :-
- Magnesia imparts Colour and Hardness in Cement.

6. Soda and/or Potash 

✍ Quantity of Soda & Potash in cement in percentage / Composition ( % ) = 0.5-1%

✍ Function :-
- These are residues

Excess of Soda or Potash in Cement :-
- cause of eflorescence and Cracking.

7. Sulphur Trioxide 

✍ Quantity of Sulphur Trioxide in cement in percentage / Composition ( % ) = 1-2%

✍ Function :-
- Excess of Sulphur Trioxide makes cement Unsound.

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