The Le-Chatelier test on cement paste detects unsoundness due to the following:

Alumina content

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Calcium sulphate content

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Magnesium oxide

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Free lime content

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Solution

The correct option is D Free lime content
Unsoundness in cement is due to excess of lime, magnesia or excessive proportion of sulphate. The Le-Chatelier test detects unsoundness due to free lime only. Autoclave test is used to detect unsoundness due to magnesia & lime.

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