Question:
\(\ldots\ldots\ldots\ldots\ldots\) phase is responsible for quick setting of cement.
\(\ldots\ldots\ldots\ldots\ldots\) phase is responsible for quick setting of cement.
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\(C_3A\) reacts quickly with water and causes quick setting. Gypsum is added to control this reaction.
Updated On: May 7, 2026
- \(C_3S\)
- \(C_2S\)
- \(C_3A\)
- \(C_3AF\)
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The Correct Option is C
Solution and Explanation
Portland cement contains different clinker phases.
The important phases are:
\[
C_3S,\quad C_2S,\quad C_3A,\quad C_3AF.
\]
Here:
\[
C_3S = 3CaO\cdot SiO_2,
\]
\[
C_2S = 2CaO\cdot SiO_2,
\]
\[
C_3A = 3CaO\cdot Al_2O_3,
\]
\[
C_3AF = 4CaO\cdot Al_2O_3\cdot Fe_2O_3.
\]
The phase \(C_3A\), also called tricalcium aluminate, reacts very rapidly with water.
This rapid reaction causes quick setting of cement.
To control this quick setting, gypsum is added during cement grinding.
Gypsum slows down the hydration of \(C_3A\) and controls setting time.
Therefore, the phase responsible for quick setting of cement is:
\[
C_3A.
\]
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