Frost resistance and chloride ion diffusion of silicafume concrete in a marine environment
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Abstract:
The properties of silica fume concrete in natural sea water are studied, with special focus on the relationship between the freezethaw durability and chloride ion diffusion coefficients. The influence of various factors on concrete resistance to frost and chloride diffusion is studied, including the watercement ratio, equivalent silica fume dosage substitution for cement, and the amount of airentraining agent and compared with that of ordinary concrete. The results show that adding silica fume cannot improve the frost resistance of concrete but it increases resistance to chloride diffusion. Both the frost resistance and chloride diffusion properties can be improved simultaneously when silica fume is used with an airentraining agent. A silica fume content of approximately 10% is the optimum value for the composite resistance to frost and chloride diffusion. A new assessment method (Rvalue method) is proposed to evaluate the composite properties of frost resistance and chloride diffusion of marine concrete.
