Discussion
The difference between the two reading of the Le-chatelier apparatus should not exceed :
Answer: C
The key's answer is 5 mm.
In the Le Chatelier soundness test, the gap between the indicator points is read before and after boiling the cement specimen, and the difference is the expansion. The Indian cement standards allow at most 10 mm of expansion, a value not among the options.
5 mm is the stricter limit the same standards apply when a cement fails the first test and is retested after aeration (spread out and exposed to air for seven days). The key takes that limit. 15 mm is above any limit in the standards, and 4 mm and 9.5 mm are not specified values.
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