Soundness test of cement as per 4031 part 3

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Soundness Test of Cement as per is 4031 part 3
If the cement contains excess lime, or is insufficiently burnt during manufacture, it is responsible to remain uncombined and
be over burnt in klin and the mortar prepared from such cement is liable to expand after setting action is complete. It is one of the
causes of cracking of cement concrete called unsoundness of cement as it shows large volume changes with change in temperature, after setting and hardening.
Such changes are undesirable as they will cause disruption of the hardened mass, Unsoundness may also be due to excessive
proportion of magnesia or of sulphates.
The soundness test ensures that the cement does not show excessive thermal expansion and if it does, it can be rejected.
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Nice information