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Title |
Shrinkage Reduction Performance of HPFRCC Using Expansive and Srhinkage Reducing Admixtures
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Authors |
박정준 ; 문재흠 ; 박준형 ; 이장화 ; 김성욱 |
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Keywords |
건조수축균열시험 ; 팽창재 ; 고성능 시멘트 복합체 ; 링-테스트 ; 수축 ; 수축저감제 ; Drying shrinkage cracking test ; Expansive Admixture (EA) ; High Performance Fiber reinforced Cementitious Composites (HPFRCC) ; Ring-Test ; Shrinkage ; Shrinkage Reducing Agent (SRA) |
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Abstract |
High-performance fiber-reinforced cement composite (HPFRCC) shows very high autogenous shrinkage, because it contains a low water-to-binder ratio (W/B) of 0.2 and high fineness admixture without coarse aggregate. Thus, it needs a method to decrease the cracking potential. Accordingly, in this study, to effectively reduce the shrinkage of HPFRCC, a total of five different ratios of SRA (1% and 2%), EA (5% and 7.5%), and a combination of SRA and EA (1% and 7.5%) were considered. According to the test results of ring-test, a combination of SRA and EA (1% and 7.5%) showed best performance regarding restrained shrinkage behavior without significant deterioration of compressive and tensile strengths. This was also verified by performing modified drying shrinkage crack test.
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