Question

Which of the following statement is incorrect about the function of admixtures?

(a) To accelerate the initial set of concrete, to speed up the rate of development of strength at early ages

(b) To enhance the workability

(c) To reduce the segregation in grout and concrete mixers

(d) To retard the initial set, to keep concrete workable for a shorter time for placement

This question was posed to me in an online interview.

Query is from Admixtures in section Admixtures and Construction Chemicals of Concrete Technology

Answer 1

Correct option is (d) To retard the initial set, to keep concrete workable for a shorter time for placement

To explain I would say: To retard the initial set, to keep concrete workable for a longer time for placement is incorrect in the above statement.