38. Influence of Silica Fume on Chloride Corrosion of Reinforcing Steel in Concrete

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The most fundamental and reliable method to prevent chloride corrosion of reinforcing steel 'in concrete exposed to marine environment is to assure sufficient cover with concrete of low permeability. The most feasible factor to reduce the permeability of concrete is to keep the water-cement ratio as low as possible. Mechanisms which inhibit corrosion as a result of higher density of cover concrete are considered to be due to retarding the penetration of water, oxygen and chloride into concrete, increasing the electric resistance of concrete and then inhibiting both anodic and cathodic reactions. As silica fume (SF) concrete is very dense and has high electric resistance, corrosion current through concrete is considered to be smaller. On the contrary, it is also reported that there may be an increase in the risk of chloride corrosion of reinforcing steel in SF concrete, since the replacement of cement by increasing proportions of SF leads to lowering of the pore solution pH and to decreasing the threshold concentration of chloride whiih induce depassivation and the capacity of cement to bind chloride ions 1). In this study, the influence of W/(C+SF), SF content, chloride content in mixing water and crack width on the chloride corrosion of reinforcing steel in SF concrete were investigated by measuring the potential and the electric resistance.

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  • Toyoki AKASHI

  • Nobuaki TAKAGI

  • Toyoaki MIYAGAWA

  • Yoshihide SAI

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