Durability and Fracture Toughness of Noncircular Type-Carbon Fiber Reinforced Cement Composites

비원형 단-탄소섬유 보강 시멘트 복합재의 내구성 및 파괴인성

  • Lee, Young-Seak (Department of Chemical Engineering, College of Engineering, Sunchon National University) ;
  • Kim, Tae-Jin (Ssangyong Research Center)
  • Received : 1999.06.16
  • Accepted : 1999.07.16
  • Published : 1999.08.10

Abstract

In this study, carbon fiber reinforced cement composites(CFRCs) reinforced with short noncircular type carbon fibers were fabricated and properties(drying shrinkage, resistance to freezing and thawing, and fracture toughness) were compared with those of the CFRCs reinforced with circular type carbon fibers. It was found that these properties greatly depended on the shape and length of carbon fibers. The drying shrinkage of CFRCs reinforced with C-type carbon fiber was superior to other CFRCs. This effect was increased with a high aspect ratio of fiber. The resistance to freezing and thawing was increased with the fiber length and fiber volume percent, but there was on remarkable effect to fiber shape. Fracture toughness and resistance to crack propagation of CFRCs reinforced with C-CFs were improved compared with other CFRCs. It was believed that the more absorption of fracture energy into the larger interface caused an increase in fracture toughness and resistance to crack propagation.

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