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Mechanical Properties of an ECC(Engineered Cementitious Composite) Designed Based on Micromechanical Principle

마이크로역학에 의하여 설계된 ECC (Engineered Cementitious Composite)의 역학적 특성

  • 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) ;
  • Kim Hee-Sin (Chungsuk Engineering, Co. LTD.,) ;
  • 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 건설 및 환경공학과) ;
  • 김정수 (한국과학기술원 건설 및 환경공학과) ;
  • 김희신 (청석엔지니어링) ;
  • 하기주 (경일대학교 건축학부) ;
  • 김진근 (한국과학기술원 건설 및 환경공학과)
  • Published : 2005.10.01

Abstract

The objective of this study is to develop a high ductile fiber reinforced mortar, ECC(Engineered Cementitious Composite) with using raw material commercially available in Korea. A single fiber pullout test and a wedge splitting test were employed to measure the bond properties in a matrix and the fracture toughness of mortar matrix respectively, which are used for designing mix proportion suitable for achieving strain-hardening behavior at a composite level. Test results showed that the properties tended to increase with decreasing water-cement ratio. A high ductile fiber reinforced mortar has been developed by employing micromechanics-based design procedure. Micromechanical analysis was initially peformed to properly select water-cement ratio, and then basic mixture proportion range was determined based on workability considerations, including desirable fiber dispersion without segregation. Subsequent direct tensile tests were performed on the composites with W/C's of 47.5% and 60% at 28 days that the fiber reinforced mortar exhibited high ductile uniaxial tension property, represented by a maximum strain capacity of 2.2%, which is around 100 times the strain capacity of normal concrete. Also, compressive tests were performed to examine high ductile fiber reinforced mortar under the compression. The test results showed that the measured value of compressive strength was from 26MPa to 34 MPa which comes under the strength of normal concrete at 28 days.

References

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