Discussion
A cement contains 65 per cent CaO of which 1.5 per cent is free lime. The combined lime is
Answer: B
Correct answer: 63.5 per cent
Combined lime is the total lime less the free lime: \[ 65 - 1.5 = 63.5\ \text{per cent.} \] The distinction matters because only the combined lime has reacted into the useful clinker compounds. Free lime hydrates slowly after the concrete has hardened and expands, which is the unsoundness the Le Chatelier test is designed to detect.
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