1.

Excess of Alkali in cement results in:(a) Dry cement paste(b) Efflorescence(c) Less plasticity(d) Unsound cement

Answer» Right option is (b) Efflorescence

The explanation: Efflorescence is the formation of powdery substance on the surface of masonry or concrete work.  Alkalis usually get carried away by flue gases during heating.  In excess quantity, they result in alkali-aggregate reaction.


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