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A Study on Chloride Binding Capacity of Various Blended Concretes at Early Age  

Song, Ha-Won (연세대학교 사회환경시스템공학부)
Lee, Chang-Hong (연세대학교 사회환경시스템공학부)
Lee, Kewn-Chu (연세대학교 사회환경시스템공학부)
Publication Information
Journal of the Korea institute for structural maintenance and inspection / v.12, no.5, 2008 , pp. 133-142 More about this Journal
Abstract
This paper studies the early-aged chloride binding capacity of various blended concretes including OPC(ordinary Portland cement), PFA(pulversied fly ash), GGBFS(ground granulated blast furnace slag) and SF(silica fume) cement paste. Cement pastes with 0.4 of a free water/binder ratio were cast with chloride admixed in mixing water, which ranged from 0.1 to 3.0% by weight of cement and different replacement ratios for the PFA, GGBFS and SF were used. The content of chloride in each paste was measured using water extraction method after 7 days curing. It was found that the chloride binding capacity strongly depends on binder type, replacement ratio and total chloride content. An increase in total chloride results in a decrease in the chloride binding, because of the restriction of the binding capacity of cement matrix. For the pastes containing maximum level of PFA(30%) and GGBFS(60%) replacement in this study, the chloride binding capacity was lower than those of OPC paste, and an increase in SF resulted in decreased chloride binding, which are ascribed to a latent hydration of pozzolanic materials and a fall in the pH of the pore solution, respectively. The chloride binding capacity at 7 days shows that the order of the resistance to chloride-induced corrosion is 30%PFA > 10%SF > 60%GGBFS > OPC, when chlorides are internally intruded in concrete. In addition, it is found that the binding behaviour of all binders are well described by both the Langmuir and Freundlich isotherms.
Keywords
Binding capacity; Blended concrete; Cholride; Corrosion resistance; Isotherm;
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  • Reference
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