Le-Chatelier test detects the unsoundness of cement due to :

Excess magnesia only

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Free lime only

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Both excess magnesia and free lime

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None of the above

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Solution

The correct option is B Free lime only
The cement having some quantity of free lime, magnesia and excess sulphates undergoes large changes of volume as the time elapses, tending to cause cracks. The soundness of cement is determined either by Le-chatelier's method or by means of an Autoclave test.

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