Vacat's apparatus is used to test the following property of concrete

Setting time of cement can be increased by adding

The maximum particle size of coarse aggregate is

A suitable admixture added at the time of preparing the concrete mix, makes the concrete

The cement whose strength is a little lower than the ordinary cement during the first three months but attains afterward…

To prevent segregation, the maximum height for placing concrete, is

Slump test is done for

The light weight aggregates are obtained from