Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Chloride Penetration Test of Concrete Simulating Deicing Salt Attack
Apparent chloride diffusion coefficient, Dc, plays as a vital index in evaluating resistance of structures against chloride attack. Our previous study reported that the coefficients obtained from existing concrete structures were ten times smaller than those obtained in chloride immersion tests. In the existing structures, chloride ions are supplied by deicing salt. There is a cycle in the supply of chloride ions, because deicing salt is sprayed only in winter season in a year. In the present study, the coefficient, Dc, was measured to investigate the chloride penetration under cyclic wetting and drying condition simulating deicing salt attack. Cyclic wetting and drying tests were conducted by changing total time of wetting and drying on cylindrical specimens. The concrete specimens were produced using Portland cement, and water-to-cement ratio of 0.55 and cured in the water for 28 days. As a result, in the cyclic wetting and drying test, total test periods Dc did not change when the ratio of immersion term and dry term is same. In addition, large variations of Dc were found in literatures. Possible reasons of the difference in Dc were discussed considering the ratio of immersion term to dry term in the literatures and this experiment.
Chloride Penetration Test of Concrete Simulating Deicing Salt Attack
Apparent chloride diffusion coefficient, Dc, plays as a vital index in evaluating resistance of structures against chloride attack. Our previous study reported that the coefficients obtained from existing concrete structures were ten times smaller than those obtained in chloride immersion tests. In the existing structures, chloride ions are supplied by deicing salt. There is a cycle in the supply of chloride ions, because deicing salt is sprayed only in winter season in a year. In the present study, the coefficient, Dc, was measured to investigate the chloride penetration under cyclic wetting and drying condition simulating deicing salt attack. Cyclic wetting and drying tests were conducted by changing total time of wetting and drying on cylindrical specimens. The concrete specimens were produced using Portland cement, and water-to-cement ratio of 0.55 and cured in the water for 28 days. As a result, in the cyclic wetting and drying test, total test periods Dc did not change when the ratio of immersion term and dry term is same. In addition, large variations of Dc were found in literatures. Possible reasons of the difference in Dc were discussed considering the ratio of immersion term to dry term in the literatures and this experiment.
Chloride Penetration Test of Concrete Simulating Deicing Salt Attack
Lecture Notes in Civil Engineering
Reddy, J. N. (Herausgeber:in) / Wang, Chien Ming (Herausgeber:in) / Luong, Van Hai (Herausgeber:in) / Le, Anh Tuan (Herausgeber:in) / Yoshizumi, Yuka (Autor:in) / Nakarai, Kenichiro (Autor:in) / Nguyen, May H. (Autor:in) / Tada, Norie (Autor:in) / Yamamoto, Masayuki (Autor:in)
28.07.2020
6 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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