|
Title |
Strain Rate Effect on the Compressive and Tensile Strength of Hooked Steel Fiber and Polyamide Fiber Reinforced Cement Composite
|
|
Authors |
김홍섭(Hong-Seop Kim) ; 김규용(Gyu-Yong Kim) ; 이상규(Sang-Kyu Lee) ; 손민재(Min-Jae Son) ; 남정수(Jeong-Soo Nam) |
|
DOI |
https://doi.org/10.11112/jksmi.2017.21.3.076 |
|
Keywords |
변형속도 ; 동적증가계수 ; 섬유보강 시멘트 복합체 ; 후크형 강섬유 ; 폴리아미드 섬유 Strain rate ; Dynamic increase factor ; Fiber reinforced cement composite ; Hooked steel fiber ; Polyamide fiber |
|
Abstract |
In this study, to evaluate the mechanical properties of fiber-reinforced cement composites by strain rate, hydraulic rapid loading test system was developed. And compressive and tensile strength of the hooked steel fiber and polyamide fiber reinforced cement composite were evaluated. As a result, the compressive strength, strain capacity and elastic modulus were increased with increasing strain rate. The effect of compressive strength by type and volume fraction of fibers was not significant. The dynamic increase factor(DIF) of the compressive strength was higher than that of the CEB-FIP model code 2010 and showed a trend similar to that of ACI-349. The tensile strength and strain capacity were increased with increasing strain rate. The hooked steel fibers were drawn from the matrix. The tensile strength and strain capacity of hooked steel fiber reinforced cement composites were increased as the strain rate increased. The tensile strength and deformation capacity of the fiber reinforced cement composites were increased. And, hooked steel fibers were drawn from the matrix. On the other hand, because the bonding properties of polyamide fiber and matrix is large, polyamide fiber was cut-off with out pullout from matrix. The strain rate effect on the tensile properties of polyamide fiber reinforced cement composites was found to be strongly affected by the tensile strength of the fibers.
|