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Title |
Influences on Concrete Quality of Residue Content Change of Chemical Admixtures
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DOI |
https://doi.org/10.4334/JKCI.2014.26.4.457 |
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Keywords |
화학혼화제 ; 인수검사 ; 고형분량 ; 리그닌계 ; 나프탈렌계 chemical admixtures ; acceptence criteria ; solid content ; ligno-sulfonate based ; naphthalene sulfonated based |
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Abstract |
The permitted limit, ±12%, of the change in solid contents based on ASTM C 494 as an interim standard in Korea Expressway Corporation, can not reflect the kind of chemical admixture and the characteristics of solid content so that it differed depending on the admixture types. In this study, effect of cement concrete quality was investigated by solid changes which can be used chemical admixtures acceptance criteria. As a result of an evaluation of a change in the quality of concrete due to solid content, since Ligno-sulfonate based (LG) had a low water reducing ratio, the range of the change in solid content was great while Naphthalene sulfonated based (PNS) and Poly-carboxylate based (PC) High Range Water-reducing Admixtures (HRWR) had a high water reducing ratio, the permitted limit of the difference in solid content currently used as the acceptance criterion should be readjusted. As a result, it is found that the acceptable range must be managed within 10% and 5% when the solid contents less than 25% and more than 25%, respectively.
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