Question:
What is the \(\%\ CaO\) in Portland cement?
What is the \(\%\ CaO\) in Portland cement?
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Portland cement contains about \(60\text{--}65\%\) lime \((CaO)\), which is essential for formation of cement clinker phases.
Updated On: May 7, 2026
- \(40\text{--}45\)
- \(60\text{--}65\)
- \(50\text{--}55\)
- \(70\text{--}75\)
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The Correct Option is B
Solution and Explanation
Portland cement is mainly composed of lime, silica, alumina, and iron oxide.
The oxide composition of ordinary Portland cement includes a high percentage of calcium oxide.
Calcium oxide is represented as:
\[
CaO.
\]
It is also called lime.
Lime combines with silica, alumina, and iron oxide to form cement clinker phases such as:
\[
C_3S,\quad C_2S,\quad C_3A,\quad C_3AF.
\]
The usual percentage of \(CaO\) in Portland cement is approximately:
\[
60\text{--}65\%.
\]
If lime is too high, it may cause unsoundness.
If lime is too low, strength development may be poor.
Therefore, the correct percentage of \(CaO\) in Portland cement is:
\[
60\text{--}65\%.
\]
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