The approx. ratio of the direct tensile strength to direct compressible strength test is

Minimum required water cement ratio for a workable concrete, is

For construction of structures in seawater, the cement generally preferred to, is

The approx. ratio of direct tensile strength to flexural strength is

Harshness in concrete is due to the excess of

Compaction test for concrete is done to determine

The aggregate which pass through 75 mm IS sieve and entirely retain on 4.75 mm IS sieve is known as

The presence of dicalcium silicate in cement