Study on Chloride Ion Transport Mechanism of Concrete under the Coupling Action of Carbonation and Erosion

Xingyu Yu

《International Core Journal of Engineering》 8卷3期 (2022/03) Pp. 604-611

https://doi.org/10.6919/ICJE.202203_8(3).0073

摘要

Concrete durability has an important impact on the safety of concrete structures. Reinforcement corrosion is one of the main factors affecting the durability of concrete, and the de passivation of reinforcement caused by concrete carbonization and chloride ion corrosion is an important reason for reinforcement corrosion. Aiming at the theoretical problem of chloride ion transmission in concrete under the coupling action of carbonation and chloride salt erosion, the indoor test research method is adopted to measure the chloride ion concentration distribution and chloride ion diffusion coefficient of concrete under the coupling action of carbonation and erosion, different temperatures and different erosion time, and analyze the chloride ion transmission mechanism in concrete under the coupling action of carbonation and chloride salt. The results show that the chloride ion concentration shows a large growth trend within 20mm from the concrete surface, and the chloride ion concentration and diffusion coefficient increase with the increase of ambient temperature; The chloride diffusion coefficient of concrete shows an increasing trend with the increase of load level, and the larger the load proportion is, the more obvious the increasing trend of chloride diffusion coefficient is. The research results can provide prediction basis for the durability of concrete structures in such coastal areas in the future.

關鍵字

Concrete ； Carbonization ； Erosion ； Chloride Ion ； Durability

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