1.

The presence of which of the below renders clay totally unsuitable for brick manufacture?(a) Kallar(b) Kankar(c) Hay(d) LimeI had been asked this question in an interview.My question is based upon Composition of Good Brick Earth topic in chapter Materials for Construction of Basic Civil Engineering

Answer»

The correct choice is (a) Kallar

Easy EXPLANATION: Kallar or REH CONSISTS of sodium sulphate.Bricks do not burn properly in its presence.After BURNING, it CAUSES the surface of brick to peel off and crumble later on.



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