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Title |
Evaluation of Chloride Diffusion Coefficients in Cold Joint Concrete Considering Tensile and Compressive Regions
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Authors |
문진만(Jin-Man Mun) ; 권성준(Seung-Jun Kwon) |
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DOI |
http://dx.doi.org/10.4334/JKCI.2016.28.4.481 |
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Keywords |
cold joint ; chloride diffusion coefficient ; tensile stress ; compressive stress ; construction joint |
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Abstract |
Concrete member has been subjected to dead and live loads in use, and the induced stress can affect not only structural but also durability behavior. In mass concrete construction, construction joint are required, however cold joint usually occur due to poor surface treatment and delayed concrete placing. The concrete with joint is vulnerable to both shear stress and chloride ingress. This paper presents a quantitative evaluation of cold joint and loading conditions on chloride diffusion behavior. With increasing tensile stress from 30% to 60%, chloride diffusion coefficient gradually increases, which shows no significant difference from result in the sound concrete. However chloride diffusion coefficient under 30% level of compressive stress significantly increases by 1.70 times compared with normal condition. Special attention should be paid for the enlarged diffusion behavior cold joint concrete under compressive stress.
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