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

Minimum required water cement ratio for a workable concrete, is

For road pavements, the cement generally used, is

A moist aggregate is one

Separation of coarse aggregates from mortar during transportation, is known,

For compacting large sections of mass concrete in structures, the types of vibrator used is

The aggregates of ......shape have minimum voids.

The test conducted by Vicat's apparatus is for