setting time

In order that the cement concrete may be palced in position of its use suitably and coveniently it is essential that the initial setting time is not too small . Similary after concrete has been placed and finisehd at its appropriate place , it should harden as early as possible so that the structure is put to use at the earliest . This cement should not lose its plasticity till various operations such as mixing , transporting ,placing and finishing are completed . The initial setting is a stage in the process of hardening that after this any crack in the concrete will not reunite .