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Building Materials

Q1:

Sea sand used in structures causes

A dampness

B efflorescence

C disintegration

D All of these.

ANS:D - All of these.

Efflorescence is the white powdery substance on the surfaces of unsealed concrete and the white blush seen with sealed floors. Efflorescence is caused by vapor migrating through the slab bringing soluble salts to the surface of the concrete.



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