Bonding Behavior between Corroded Steel Strand and Concrete

In order to research the effect of corrosive environment on the bonding behavior between steel strand and concrete, the curves of bonding stress vs slip of the specimens of steel strand bonded with concrete in four different corrosive environments were obtained by electrochemical accelerated corrosion test, and were analyzed by comparison with that of the uncorroded specimen. The results show that the influence order of corrosive environment on the bonding behavior from big to small was sodium chloride solution, simulated acid rain, sodium sulfate solution and sodium nitrate solution for the same corrosion time. With the prolongation of corrosion time, the corrosion degree increased, the bonding strength and bonding stiffness all decreased, but they were still larger than that of the uncorroded specimen. In mild corrosion, corrosion products improved the ultimate bonding strength. The ultimate bonding strengthes of the specimens corroded in sodium nitrate solution and sodium sulfate solution were 2.56 times and 2.35 times higher than that of uncorroded specimen, respectively, and were obviously higher than those of specimens corroded in simulated acid rain and sodium chloride solution, but the bonding behavior of different specimens was not changed much.