Proceedings of the Korea Concrete Institute Conference (한국콘크리트학회:학술대회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Shrinkage and Cracking Behavior of Ultra High Strength Concrete

초고강도 콘크리트의 수축 및 균열 특성에 관한 연구

  • 김지원 (삼성물산(주)건설부문) ;
  • 손유신 (삼성물산(주)건설부문 기술연구소) ;
  • 이주하 (고려대학교 사회환경시스템공학과) ;
  • 윤영수 (고려대학교 사회환경시스템공학과)
  • Published : 2005.05.01
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Abstract

In this study, to investigate shrinkage and cracking behavior of 120MPa UHSC, free and restrained drying shrinkage test were performed. Three strength levels(50MPa, 80MPa, 120MPa) were used and the effect of mineral admixtures(fly ash, slag) on free and restrained shrinkage was investigated. From comparing the result of pin -penetration test with the result of ring test, Time-Zero was determined as initial set. Shrinkage test results show that autogenous shrinkage of UHSC was much higher than that of HSC, VHSC and fly ash delayed cracking age in UHSC by decreasing autogenous shrinkage. Additional free concrete rings(with restraint removed) were also tested to check the influence of the geometry of the specimens on free shrinkage. And then the relationship between free shrinkage and restrained shrinkage was investigated.

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