Question

Silica in excess causes ________

(a) The cement to set slowly

(b) The cement to set quickly

(c) The cement to expand

(d) The cement to disintegrate

I had been asked this question by my school teacher while I was bunking the class.

This is a very interesting question from Types of Cement topic in section Types of Cement and Testing of Cement of Concrete Technology

Answer 1

The correct option is (a) The cement to set slowly

To elaborate: Silica gives strength to the cement. Silica in excess causes the cement to set slowly.