Discussion
A high mica content is undesirable in concrete aggregate because mica
Answer: A
Correct answer: provides planes of weakness and a poor bond
Mica cleaves into thin flakes along its basal plane, so each flake is a plane of weakness in the aggregate and splits under load. The flat faces also bond poorly to the cement paste and increase the water demand of the mix. A few per cent is tolerable; more is a reason to reject the source.
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