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http://dx.doi.org/10.4334/JKCI.2002.14.5.789

Evaluation of Chloride Bound Ratio in Cement Pastes by Pore Solution Analysis  

소승영 (담양대학 건축ㆍ실내디자인과)
윤성진 (전북대학교 건축 도시공학부)
소양섭 (전북대학교 건축 도시공학부)
Publication Information
Journal of the Korea Concrete Institute / v.14, no.5, 2002 , pp. 789-795 More about this Journal
Abstract
To evaluate the bind rate and behavior of two types chloride ion-one is the chloride ion added in mixture when un-washed sea sand is used as fine aggregate, one is the chloride ion admitted in the new version of concrete standard specification, pore solution extracted in cement paste were analyzed. The results are follow. 1 As passing the time, the chloride concentration in the pore solution decreases with the Increase in the chloride content absorbed by the hydrate products. As compared with chloride contents in mixing water, the bound ratio of chloride at 49 days is 64∼90％. 2. The bound ratio of chloride in cement paste considering evaporable water as pore solution is obtained. In case of Pl∼P3(added chloride content wt of cement 0.046∼0.16 ％), the bound ratio of chloride is 91.8∼93.5 ％. P4(added chloride wt of cement 0.3％) is 89.1％, but P5(added chloride wt of cement 0.617％) bound is only 77％. 3. The bound ratio of chloride to wt of cement is 0.015∼0.475％ with adding chloride. In case chloride added over 0.091 ％ wt of cement, the bound chloride content increases 1.7∼1.8 times in spite of added chloride increase twice. The bound ratio of chloride to wt of cement decreased with the increase in the chloride content. 4. The more increase added chloride content, the more increase the bound ration of chloride. But the absolute value of chloride content in pore solution increased.
Keywords
pore solution; chloride; the bound ratio of chloride;
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