Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Interfacial Pullout Characteristics of Recycled PET Fiber With Hydrophilic Chemical Treatments in Cement Based Composites

화학적 친수성 처리율에 따른 재생 PET 섬유와 시멘트 복합재료와의 계면 인발 특성

  • Won, Jong-Pil (Dept. of Civil & Environmental System Engineering, Konkuk University) ;
  • Park, Chan-Gi (Dept. of Civil & Environmental System Engineering, Konkuk University) ;
  • Kim, Yoon-Jeong (Dept. of Civil & Environmental System Engineering, Konkuk University) ;
  • Park, Kyung-Hoon (Dept. of Civil & Environmental System Engineering, Konkuk University)
  • 원종필 (건국대학교 사회환경시스템공학과) ;
  • 박찬기 (건국대학교 사회환경시스템공학과) ;
  • 김윤정 (건국대학교 사회환경시스템공학과) ;
  • 박경훈 (건국대학교 사회환경시스템공학과)
  • Published : 2007.06.30
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Abstract

The purpose of this study was to enhance bond performance between recycled PET (polyethylene telephthalat) fiber and cement composites through hydrophilic treatment using maleic anhydride grafted polypropylene(mPP). The mPP with various concentration of 0%, 5%, 10%, 15% and 20% to determine effect on bond behavior of recycled PET fiber were applied as experimental variables. Dog bone shaped specimens according to JCI SF-8 was applied to evaluate the bond strength and pullout energy. The results showed increased bond strength and pullout energy as concentration of mPP. Concentration of 15% mPP showed the most effective results while 20% showed reduced performance results. Because 15% mPP ensures perfect coating while 20% makes thick coating area that resulted in crack propagation and consequent separation of PET fiber and coated area during pullout load occurred. Enhancement mechanism of bond performance of recycled PET fiber and cement composites with each concentration of mPP could be conformed through investigation of microstructure of fiber surface.

본 논문은 재생 PET 섬유와 시멘트 복합재료와의 부착 성능을 향상시키고자 친수성 물질인 무수말레인산이 그라프트된 폴리프로필렌을 이용하여 친수성 처리 효과를 평가하였다. 실험 변수는 무수말레인산이 그라프트된 폴리프로필렌의 농도 0%, 5%, 10%, 15% 및 20%를 고려하였다. 부착 실험은 ICI SF-8에 따라 dog bone 공시체를 이용하였으며 부착강도 및 인발 에너지를 평가하였다. 실험 결과 부착 거동, 부착강도 및 계면 인성은 무수말레인산의 농도가 증가할수록 증가하는 효과를 보여주었다. 특히 15%에서 가장 큰 효과를 발휘하였으며 농도가 20%가 되면 오히려 부착성능이 감소하였다. 이는 재생 PET 섬유의 표면은 무수말레인산이 그라프트된 폴리프로필렌의 농도가 15% 이상이 되면 전체적으로 완벽하게 코팅이 가능하나 20% 코팅시에는 코팅 부분에서 부분적으로 균열이 발생하여 이를 통하여 부착하중 작용시 균열 부분을 통한 파괴가 발생하기 때문이다. 섬유 표면의 미소 구조 관찰에서 무수말레인산의 농도에 따른 재생 PET 섬유와 시멘트 복합재료와의 부착력 향상 메커니즘을 확인할 수 있다.

Keywords

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