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

Expansion joints are provided if the length of concrete structures exceeds

A ordinary Portland cement when tested for its fineness, should not leave any residue on I.S. sieve No. 9, more than

Slump test of concrete is a measure of its

For reinforced cement concrete lintels and slabs, the nominal size of coarse aggregate should not exceed

An aggregate having all the pores filled with water but having dry surface is called

Air entrainment in concrete increases:

In designing a ware-house, it is assumed that