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Title |
A Study for Application of Polycarboxilic Type Admixture to Precast High-Strength Concrete Piles
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Keywords |
폴리카본산(PC)계 혼화제 ; PNS계 혼화제 ; 프리캐스트 ; 고강도콘크리트 ; 파일 Polycarboxilic type-admixture ; Poly-naphthalene sulfonate type-admixture ; Precast ; High-strength concrete ; Piles |
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Abstract |
In this study, the performance of Poly-Naphthalene Sulfonate (PNS) type-admixture used widely in South Korea and Polycarboxilic type-admixture(i.e., WF2000) developed in the J company of the domestic, for precast concrete products produced in the factories, was evaluated. With the 20% reduced usage of WF2000 compared to PNS type-admixture, workability was considerably improved due to high water-reducing ratio, accelerating effect of concrete setting and accelerant dispersant action, which the product has, under the high temperature. In addition, the development of initial and long-term strengths of PHC plies was predominant. For WF2000, it is also possible to correspond with the change of original materials and environmental conditions since the control of water-reducing and supporting forces is feasible. Accordingly, it was noted that WF2000 is superior for deterioration of production & workability and bad casting problems in summer and the solution of initial strength reduction problem due to the delay of setting in winter.
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