What is the bond action between reinforcement and concrete A

What is the bond action between reinforcement and concrete? And how many types of bond action 1.

Solution

Reinforced concrete being a composite material, In order to ensure strain compatibility (same strain in concrete and steel) at various stress levels the steel must be firmly bonded with concrete so that the steel bars don\'t slip from the reinforced concrete member when it undergoes strain.

The maximum stress a steel bar can withstand without slippage from the surrounding concrete is called as bond strength

This strength is achieved by following mechanisms

ADHESION between steel and concrete due to chemical bond

FRICTION between the steel surface and adjoining concrete

And Additional MECHANICAL INTERLOCK in deformed bars where deformations on the steel bar surface acts as anchors to resist the relative movement of steel with respect to concrete.