Which of the following ingredients of cement, when added in excess quantity, causes the
cement to set slowly?
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A.
Lime
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B.
Silica
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C.
Iron oxide
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D.
Alumina
Correct Answer:
B. Silica
Explanation:
The correct answer is Alumina. While alumina is a vital ingredient in cement that provides quick-setting properties by acting as a flux during the manufacturing process, adding it in excessive quantities acts as a retardant. In high concentrations, alumina slows down the chemical reaction of hydration, thereby increasing the time it takes for the cement to set and reach its initial strength.
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