Advances in chloride diffusion of concrete exposed to marine field environment

For elaborating the research significance, goal, content and representative results of the concrete marine field exposure experiments all over the world, we have collected a large number of research literature since 1905. The longest exposure test for concrete has reached 62 years and, most importantly, concrete exposure experiments have made great contributions to the establishment of three classical chloride diffusion models such as DuraCrete model, Life- 365 model and ClinConc model. And the comparison with foreign countries shows that concrete marine field exposure sites in China should adhere to long-term research with continuous tracking tests, for purpose of improving the durability evaluation method and life design theory of concrete structures in the harsh marine environment. Moreover, by analyzing the chloride content in the RC components after 42 months of exposure in the submerged zone in South China Sea, the diffusion depth of the chloride exceeds 40 mm, and the distribution of chloride content with diffusion depth is quite consistent with the chloride diffusion model established by Yu