Discussion
Adding limestone as a minor constituent of cement is permitted by many standards because it
Answer: B
Correct answer: improves particle packing and reduces clinker use
Finely ground limestone fills the spaces between the larger cement grains, giving a denser packing and a lower water demand at the same workability. It also nucleates hydration and reacts a little with the aluminate. The result is that a proportion of the clinker - typically up to 15 per cent - can be replaced with little loss of performance.
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