팽창재와 수축저감제를 사용한 HPFRCC의 수축 저감 성능
Shrinkage Reduction Performance of HPFRCC Using Expansive and Srhinkage Reducing Admixtures
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초록
HPFRCC는 물-결합재비 (W/B)가 20%로 상당히 낮고 굵은 골재를 사용하지 않으며, 고분말 혼화재료를 혼입하기 때문에 자기수축이상당히 크게 발생하여 구조물 적용 시 균열저감대책이 필요하다. 따라서 이 연구에서는 HPFRCC의 수축을 효율적으로 저감시키기 위한방법으로 수축저감제와 팽창재의 사용을 검토하기 위하여 이들의 단독 또는 병행 혼입률에 따른 역학적 특성과 구속 수축특성을 평가하였다. 구속수축 실험 중에서 링-테스트 (Ring-test)를 통하여 HPFRCC에 사용되는 시멘트에 대하여 중량비로 수축저감제 1%와 팽창재를7.5%를 병행 사용하였을 경우 압축강도와 인장강도가 크게 저하되지 않으면서도 수축을 가장 효율적으로 저감시킬 수 있는 최적 배합임을도출하였고 수정된 건조수축 균열실험을 통하여 이를 검증하였다.
Abstract
High-performance fiber-reinforced cement composite (HPFRCC) shows very high autogenous shrinkage, because it contains alow water-to-binder ratio (W/B) of 0.2 and high fineness admixture without coarse aggregate. Thus, it needs a method to decreasethe cracking potential. Accordingly, in this study, to effectively reduce the shrinkage of HPFRCC, a total of five different ratiosof SRA (1% and 2%), EA (5% and 7.5%), and a combination of SRA and EA (1% and 7.5%) were considered. According to thetest results of ring-test, a combination of SRA and EA (1% and 7.5%) showed best performance regarding restrained shrinkagebehavior without significant deterioration of compressive and tensile strengths. This was also verified by performing modifieddrying shrinkage crack test.
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