What will happen if we use too much rebar in concrete?

Posted by Civil Engineering on

Wednesday 7 April 2021

The main principle is that concrete has strong resistance to compression failure therefore it is strong in compression however it is weak in tension resistance to bending that is why steel compensates this weakness hence its strong in tension Having more percentage than the specified will cause the concrete to act as steel structure which is basically is not steel aimed structure besides that the area occupied by more reinforcement will weaken the concrete to act in compression resistance and punching shear and brittle failure may occur especially in the perpendicular structure such as columns at the time of ultimate strength, in conclusion, the standards have undergone plenty of experiences by experts to bring forward simple references for a designer I hope you have gained insight hints.

Rebar or reinforcement is expensive. Using more than recommended will be uneconomical. Moreover, providing adequate spacing between the rebars will be difficult. IS 456:2000 recommends minimum and maximum spacing which has to be fulfilled.

One more disadvantage of providing excess rebar is that the placement of concrete will become difficult. The concrete should be placed uniformly in the framework which would be affected by the presence of excess rebar.

Then the concrete will fail first, which is a brittle material so you will not get any warnings of failure beforehand, which means a sudden failure without warning and it can therefore cause loss of lives… this is a very unwanted situation. The rebar should be below a certain limit so that when the failure will happen, the rebar will start to fail, which is a ductile material so it gives a warning before the collapse and can save lives.

Labels: Construction, Materials

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