Durability of reinforced concrete beams repaired with various repair materials

This study was carried out to evaluate the performance of a few concrete repair materials in resisting rebar corrosion. The repair materials were evaluated by water permeability, chloride permeability and accelerated corrosion tests. These repair materials were used to repair reinforced concrete beams and they were exposed to sodium chloride solution. The effect of heat-cool cycling on the corrosion resistance of the repair materials and repaired beams was studied.;The half-cell potentials and corrosion rates of rebars in repaired beams were lower than, and those of rebars in beams subjected to heat-cool cycling were higher than, those in beams which were not subjected to heat-cool cycling. (Abstract shortened by UMI.).;The water permeability of all the repair materials, viz. silica fume mortar, polymer modified cementitious mortar, ordinary cement mortar and ferrocement mortar was lower than that of plain concrete. The chloride permeability of silica fume mortar and polymer modified cement mortar samples was lower than that of plain concrete samples. The time for initiation of corrosion was longer in silica fume mortar and polymer modified cementitious mortar samples, and was smaller in ferrocement and ordinary cement mortar samples, than plain concrete samples.