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Development of an ECC(Engineered Cementitious Composite) Designed with Ground Granulated Blast Furnace Slag

고로슬래그미분말이 혼입된 ECC(Engineered Cementitious Composite)의 개발

  • Kim, Yun-Yong (Dept. of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology) ;
  • Kim, Jeong-Su (Dept. of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology) ;
  • Ha, Gee-Joo (School of Architecture, Kyungil University) ;
  • Kim, Jin-Keun (Dept. of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology)
  • 김윤용 (한국과학기술원 건설및환경공학과) ;
  • 김정수 (한국과학기술원 건설및환경공학과) ;
  • 하기주 (경일대학교 건축학부) ;
  • 김진근 (한국과학기술원 건설및환경공학과)
  • Published : 2006.02.28

Abstract

This paper presents both experimental and analytical studies for the development of an ECC(Engineered Cementitious Composites) using ground granulated blast furnace slag(slag). This material has been focused on achieving moderately high composite strength while maintaining high ductility, represented by strain-hardening behavior in uniaxial tension. In the material development, micromechanics was adopted to properly select optimized range of the composition based on steady-state cracking theory and experimental studies on matrix, and interfacial properties. A single fiber pullout test and a wedge splitting test were employed to measure the bond properties of the fiber in a matrix and the fracture toughness of mortar matrix. The addition of the slag resulted in slight increases in the frictional bond strength and the fracture toughness. Subsequent direct tensile tests demonstrate that the fiber reinforced mortar exhibited high ductile uniaxial tension behavior with a maximum strain capacity of 3.6%. Both ductility and tensile strength(~5.3 MPa) of the composite produced with slag were measured to be significantly higher than those of the composite without slag. The slag particles contribute to improving matrix strength and fiber dispersion, which is incorporated with enhanced workability attributed to the oxidized grain surface. This result suggests that, within the limited slag dosage employed in the present study, the contribution of slag particles to the workability overwhelms the side-effect of decreased potential of saturated multiple cracking.

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