Journal of the Architectural Institute of Korea Structure & Construction (대한건축학회논문집:구조계)

Architectural Institute of Korea (대한건축학회)
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Effect of Water-Binder Ratio and Replacement Ratio of Fly Ash on the Workability and Engineering Properties of Heavy-Weight Concrete

중량 콘크리트의 유동성 및 역학적특성에 대한 물-결합재비와 플라이애쉬 치환율의 영향

  • 문재성 (경기대학교 대학원 건축공학과) ;
  • 양근혁 (경기대학교 플랜트.건축공학과) ;
  • 이호 (경북대학교 건축공학과)
  • Received : 2012.05.25
  • Published : 2012.08.25
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Abstract

In this study, 10 heavy-weight concrete(HWC) mixes using magnetite aggregates were tested according to the variation of the water-to-binder ratio and the replacement ratio of fly ash. The different engineering properties of HWC, which include compressive strength development, stress-strain relationship, moduli of elasticity and rupture, splitting tensile strength and bond stress-slip relationship, were measured and compared with ACI 349 and/or CEB-FIP predictions. Test results showed that the tensile resistance capacity and long-term compressive strength gain of HWC are somewhat lower than the CEB-FIP prediction. In addition, the replacement of fly ash marginally affected the relationship of compressive strength of HWC and its engineering properties, though the amount of slip of a reinforcing bar embedded in HWC sharply increased when the replacement ratio of fly ash is above 25%. Hence, while considering the workability, compressive strength development and slip resistance against a tensile ribbed bar, the optimum replacement ratio of fly ash in HWC using magnetite aggregates can be recommended to be 15~20%.

Keywords

Acknowledgement

Supported by : 한국과학재단, 한국에너지기술평가원(KETEP)

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