Setting time of cement increases by adding

A concrete having a slump of 6.5, is said to be

The C4AF in cement has the cementing value

Which of the following ingredient of cement when added in excess quantity, caused the cement to set slowly?

Le-Chatelier's apparatus is used for testing

The entrained air in concrete

The test conducted by Vicat's apparatus is for

The sieve number used in the fineness modules test of cement is