Discussion
Assertion (A): A cement may pass the Le Chatelier test and still be unsound.
Reason (R): Boiling water does not hydrate magnesia, which the autoclave test does reach.
Answer: A
Both are true and the reason gives the gap in the simpler test: free lime is detected but periclase is not, so a cement high in magnesia can pass and yet expand in service years later. Where magnesia is a concern the autoclave test is the one specified.
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