Question

Chemical admixture may accelerate or slow down the rate at which the concrete hardens.

(a) True

(b) False

This question was addressed to me by my college professor while I was bunking the class.

The query is from Earthwork, Concrete and R.C.C. work in chapter Rules and Methods of Measurement of Civil Engineering Drawing

Answer 1

Right option is (a) True

Easiest explanation: Chemical admixtures are added to achieve varied properties. These ingredients may accelerate or slow down the rate at which the concrete hardens, and impart many other useful properties including increased tensile strength, entrainment of air and water resistance.