The cement concrete in which high compressive stressed are artificially induced before its actual use, is called

The importance of batching is to obtain

Separation of water or water sand cement from a freshly concrete, is known

Setting time of cement increases by adding

Sand requiring a high water cement ratio belongs to

The gypsum is added to the cement for

An air- entraining agent when added to cement improves

According to I.S. : 456, the number of grades of concrete mixes, is