FLEXURAL BEHAVIOR OF TWO-SPAN REINFORCED CONCRETE BEAMS SUBJECTED TO SELECTED FACE CORROSION AFTER INITIALLY LOADED _ EXPERIMENTAL AND FINITE ELEMENT

Abstract

Abstract This study investigates the influence of reinforcement corrosion on the mechanical properties of two-span concrete beams. Twenty-two reinforced concrete beams were designed, cast, and subjected to accelerated corrosion using the impressed current technique. Results are presented in terms of load-deflection curves, cracking patterns, and modes of failure for each beam. For corrosion initiation and propagation; results are presented in terms of voltage readings versus duration for each beam. Unloaded, as well as initially loaded beams, were tested and results are compared to a non-corroded control beam. Beams were divided into three groups: one loaded under own weight only, the second initially loaded to 40% of the ultimate load, and the third loaded to 60% of the ultimate load. Results showed the great influence of initially loading the beams before subjecting to corrosion on the mechanical behavior of the beams in the flexural test as well as the rate of corrosion initiation and propagation. Also, combined actions of loading and corrosion showed a negative effect on beams’ stiffness and load carrying capacities even at a low degree of corrosion and before concrete cover spalling.