Advances in concrete pile durability in corrosive environment

Abstract:

The durability of underground concrete structures in corrosive environments is one of the hottest issues. The current research works on the durability of underground concrete structures in marine and offshore chlorine salt erosion environment and saline lake and inland saline sulfate environment were summarized based on concrete corrosion mechanism, erosive ion diffusion mechanism, rebar corrosion mechanism, concrete strength and stiffness damage and other aspects, respectively, and the damage characteristics and degradation mechanisms of underground concrete structures under chloride and sulfate corrosion environment were discussed. Considering the production technology of the PHC pipe pile and the bored pile, the deterioration mechanism of horizontally loaded PHC pipe pile in marine environment and vertically loaded bored pile in saline soil environment were discussed, respectively. The degradation laws of their load-bearing characteristic were investigated by considering the loading mechanism of bored piles and PHC pipe piles, and the methods for predicting the service life of horizontally loaded PHC pipe pile in marine environment and vertically loaded bored pile in saline soil environment were proposed. Finally, based on the current study, the further research ideas and directions were proposed to provide references for the durability research of reinforced concrete pile in corrosive environment and complicated stress conditions, and as well as the formulation of relevant standards.