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What is the problem with using flyash bricks?

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in Basic Civil Engineering by (111k points)
What is the problem with using flyash bricks?

(a) Efflorescence

(b) Costly

(c) Expand

(d) Not sound proof

The question was posed to me in quiz.

Question is taken from Types of Bricks topic in division Materials for Construction of Basic Civil Engineering

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The correct answer is (c) Expand

Easiest explanation: When they come in contact with moisture, chemical reaction occurs and they tend to expand.

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