Concrete Technology Sheet 16

According to IS : 456-1978, if fy is the characteristic strength of steel and Es is the modulus of elasticity of steel, then the maximum strain in the tension reinforcement in the section at failure should not be less than

The compressive strength of concrete determined from 150 mm × 150 mm cylinders as compared to that determined from 150 mm cubes is

The compressive strength of concrete determined from 150 mm × 150 mm cylinders as compared to that determined from 150 mm × 300 mm cylinders is

If compressive strength of concrete determined from 150 mm × 300 mm cylinders is x, then the compressive strength of same concrete determined from 150 mm cubes is

As compared to moist-cured concrete, the permeability of steam-cured concrete is

For high degree of workability, the slump value should vary between -

The top diameter, bottom diameter and height of the mould used for slump test are respectively -

The steel mould used for slump test is in the form of a -

The workability of concrete can be improved by adding -

The workability of concrete is expressed by -

The use of air-entraining agents in concrete -

For the improvement of workability of concrete, the shape of aggregate recommended is -

The internal friction between the ingredients of concrete is minimised by -

The concrete mix is said to be workable if it has -

Water-cement ratio is, usually, expressed in -

If the water cement ratio is more, then the -

The development of first 28 days strength is on account of the hydration of -

Hydration of cement is due to the chemical action of water with -

According to the rule of water cement ratio, the strength of concrete wholly depends upon -

The rule of water cement ratio was established by -