Compaction test for concrete is done to determine

Minimum required water cement ratio for a workable concrete, is

The bulking of aggregate is due to

Higher workability of concrete is required if the structure is

The light weight aggregates are obtained from

For constant w/c ratio if the aggregate/cement ratio is reduced, the workability of concrete

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

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