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Title |
The Effect of Fiber on the Pull-Out Behavior and Tensile Performance of FRCC
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Authors |
이예찬(Yae-Chan Lee) ; 김규용(Gyu-Yong Kim) ; 남정수(Jeong-Soo Nam) ; 김홍섭(Hong-Seop Kim) ; 이상규(Sang-Kyu Lee) |
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DOI |
https://doi.org/10.4334/JKCI.2021.33.4.411 |
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Keywords |
직접인장시험; 섬유인발; 후크형 강섬유; 폴리아미드 섬유; 비정질 강섬유 direct tensile test; fiber pull-out; hooked steel fiber; polyamide fiber; amorphous metallic fiber |
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Abstract |
In this study, pull-out test and direct tensile test were conducted for HSF, PA and AF which have different physical properties and shapes to evaluate the effect of fiber pull-out behavior in fiber-reinforced cementitious composites (FRCC). In the pull-out test, HSF was pulled out while the end of the fiber was straightened, and PA and AF exhibited a fracture behavior because the bond stress between the fiber and the matrix was greater than the tensile strength of the fiber itself. HSFRCC showed high load-holding ability in the direct tensile test, and it was judged that the bonding stress and mechanical bonding stress between the fiber and the matrix had great influence on the tensile performance of HSFRCC due to the pull-out behavior. PAFRCC strain capacity was evaluated highly because of its high elongation and load dispersing ability. On the other hand, AF showed excellent tensile strength because of the high fiber quantity per unit volume and high bonding stress between the fiber and the matrix. In addition, the fracture behavior of PA and AF demonstrated, how the tensile performance of the fiber itself greatly affects the tensile performance of FRCC. It is considered that fiber pull-out behavior is compounded by several factors such as the tensile strength of FRCC, the bonding stress between the fiber and the matrix, the tensile strength of the fiber, and the number of mixed fibers.
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