The rule of water cement ratio was established by

Most commonly used material for accelerating hardening of the concrete is

Higher workability of concrete is required if the structure is

The grade of concrete M 150 means that compressive strength of 15 cm cube after 28 days, is

In transportation of concrete by pumps

Addition of air entraining agents to concrete increases all of the following EXCEPT

The commonly used material in the manufacture of cement is

Bulking of sand is