Question

While placing concrete in hot weather, the aggregate should be _____________ to bring down the temperature of concrete.

(a) Burnt

(b) Pre cooled

(c) Heated

(d) Washed

I have been asked this question in a national level competition.

Query is from Placing of Concrete in chapter Cement Concrete Construction of Construction & Building Materials

Answer 1

Correct answer is (b) Pre cooled

For explanation I would say: In summer, the usual mistake made while placing concrete is the addition of extra water to the mixture as well as the finish concrete surface. Such an extra water resistance the strength and other properties of concrete.