Abstract
Abstract This study investigates the resistance of concrete-containing nanosilica to the coupled effects of scouring and chloride diffusion compared with that of unmodified concrete. Based on Fick’s 2nd law of pure diffusion, a theoretical formula for chloride concentration in concrete under the coupled effects of scouring and chloride diffusion was established. By performing comparison experiments, an increasing mutually reinforcing effect between the scouring wear and the chloride diffusion was observed, which agreed with the simulation results. Benefitting from a better microstructure and porosity, the concrete-containing nanosilica at 2% cement weight showed better resistance to chloride ion penetration, as well as wear resistance. It was found that, with respect to resisting the coupled effects, the concrete-containing nanosilica exhibited a better performance than the unmodified concrete.
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