what is the density of concrete & steel?
where we are using pycnometer?
what is bulking of sand?
what is under reinforced & over reinforced?
what is balanced section?

Answer Posted / itika chaudhary

Density of concrete is 2240-2400 kg/m3.
Density of steel is 7860 kg/m3.
The Pycnometer can be used for determination of the specific gravity of solid particles of both fine grained and coarse grained soils.
As the moisture content of a fixed weight of sand increases, the volume also
increases--up to a point. This is known as bulking of sand.
An under-reinforced beam is one in which the tension capacity of the tensile reinforcement is smaller than the combined compression capacity of the concrete and the compression steel.
An over-reinforced beam is one in which the tension capacity of the tension steel is greater than the combined compression capacity of the concrete and the compression steel.
A balance section is one in which the concrete crushing and steel yielding take place at the same time.

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