Question

The final setting time of high alumina cement is about _______

(a) 30 mins

(b) 2 hours

(c) 5 hours

(d) 24 hours

This question was addressed to me in my homework.

This question is from Plain and Reinforced in chapter Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials

Answer 1

Right choice is (c) 5 hours

For explanation I would say: The final setting time of high alumina cement is about 5 hours. The setting action of this cement mainly depends on the chemical reactions and therefore it is not essential to grind it to a fine powder. Great amount of heat is evolved during setting.