Select the correct option based on the given statements about the soundness test of cement.
Statement 1: The soundness test ensures that cement does not undergo excessive expansion after setting.
Statement 2: Excess magnesia (MgO) and free lime (CaO) in cement cause volume expansion.
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A.
Statement 1 is true, but Statement 2 is false.
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B.
Both statements are true, and Statement 2 explains Statement 1.
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C.
Both statements are true, but Statement 2 does not explain Statement 1.
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D.
Statement 1 is false, but Statement 2 is true.
Correct Answer:
B. Both statements are true, and Statement 2 explains Statement 1.
Explanation:
The soundness test is conducted to ensure that cement does not experience significant volume changes or excessive expansion after it has set. Expansion is primarily caused by the presence of excess free lime (CaO) and magnesia (MgO) in the cement composition, which hydrate slowly and lead to internal stress and cracking. Since Statement 2 identifies the specific chemical causes that lead to the expansion described in Statement 1, both statements are accurate, and the second provides the underlying explanation for the first.
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