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A Study on the Durability Improvement of Highway-Subsidiary Concrete Structure Exposed to Deicing Salt and Freeze-Thaw
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 Title & Authors
A Study on the Durability Improvement of Highway-Subsidiary Concrete Structure Exposed to Deicing Salt and Freeze-Thaw
Lee, Byung-Duk; Choi, Yoon-Suk; Kim, Young-Geun; Choi, Jae-Seok; Kim, Il-Sun;
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 Abstract
In the current concrete structure of the highway is still the major problem most of concrete deterioration caused by the freeze-thaw and deicing salt, which is of issues that are not completely resolved. In particular, a single freezing event does not cause much harm, durability of concrete under multi-deterioration environment by repeated freeze-thaw and deicing salt is rapidly degraded and reduce its service life. In this study, the exposure environmental condition according the regional highway points were established. The damage condition and chloride content of the concrete at general and severe environmental exposure condition were also investigated. In addition, the experimental test of chloride ion permeability, scaling resistant and freeze-thaw resistance were carried out to improve the durability of the mechanical placing concrete of subsidiary structure. According to the results of this study, in observation of concrete surface condition, the concrete exposed by severe environmental condition showed broad ranges of damage with high chloride contents. Meanwhile, the water-binder(W/B) ratio and the less water content, and fly ash concrete than the specified existing mix proportion is significantly improved the durability. Also, the optimal mix proportion derived for test is satisfied the strength and air contents, water-binder ratio, and durability criteria of concrete specifications, as well as service life seems greatly improved.
 Keywords
Freeze-thaw;Deicing salt;Exposure environmental condition;Durability;Highway-subsidiary concrete structure;
 Language
Korean
 Cited by
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