DEGRADATION OF THE BOND BETWEEN CONCRETE AND STEEL UNDER CYCLIC SHEAR LOADING, MONITORED BY CONTACT ELECTRICAL RESISTANCE MEASUREMENT

Degradation of the bond between steel reinforcing bar (rebar) and concrete under cyclic shear loading was observed nondestructively by measuring the contact electrical resistance of the joint. Degradation, which caused a decrease in bond strength but no visual damage, was indicated by an abrupt increase in the resistance at a small fraction of the fatigue life.

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