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Non corrosive life estimation of concrete containing ground blast furnace slag in chlorine environment

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Document pages: 10 pages

Abstract: Based on the mathematical estimation of chloride ion diffusion and transmission rate in concrete containing ground blast furnace slag (GGBS), the corrosion-free service life of concrete structures exposed to seawater environment is predicted. As a factor of corrosion of steel embedded parts, the substitution rate of GGBS is selected, accounting for 25 and 50 of the total adhesive. The results show that the increase of GGBS content leads to the increase of chloride binding capacity, which will lead to a lower chloride diffusion rate, thus reducing the risk of chloride induced corrosion. When it comes to the sensitivity of parameters to service life, regardless of the content of GGBS, the effect of effective diffusivity on service performance is minimal, and the surface chlorideent and critical threshold concentration revealed more crucial factors to long term chloride diffusion. As the GGBS replacement increased, the variation in service life has become less influential with changing parameters. Substantially, GGBS concrete at high replacement ratio enhanced the service life due to a combination of dense pore structure and enhanced chloride binding capacity.

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