Experimental Study on the Effect of Steel Fiber Embedment Depth and Type on the Interfacial Bonding Properties of Steel Fiber-UHPC Matrix
YUAN Ming1, ZHU Haile1, YAN Donghuang1,*, YUAN Sheng1, HUANG Lian1, LIU Yun1,2
1 School of Civil Engineering, Changsha University of Science and Technology,Changsha 410114,China 2 School of Road and Bridge Engineering, Hunan Communication Polytechnic,Changsha 410132,China
Abstract: In order to study the influence factors of interfacial bond performance between steel fiber and ultra-high performance concrete (UHPC) matrix, to further clarify the failure mode of the bonding interface between two steel fibers and UHPC matrix under different fiber types and embedment depths. Through the double fibers pull-out test, the pull-out behavior of high-strength steel fibers with different buried depths in UHPC matrix was studied to understand the pull-out performance of fibers and the interfacial bonding performance of UHPC. The fiber pull-out test used fiber type and embedment depth as variables to characterize and analyze the evaluation parameters of two steel fibers under different fiber embedment depths, and observed the microscopic morphology of the fibers after pulling out and the tunnel shape of the UHPC matrix. The test results show that the pullout performance of end-hooked fiber is better than that of straight circular fiber; through SEM, it observes that the surface of the pulled straight circular fiber is adhered by floc or cluster of micro UHPC matrix particles, leaving varying degrees of scratches or long and wide scratches. There are microcracks in the UHPC matrix tunnel, and the matrix near the exit of the tunnel is peeled off during the fiber pulled out process. At the same time, the pullout performance of steel fiber was related to the fiber embedment depth, but the embedment depth had a greater impact on the end-hooked fiber, the peak pull-out load reached 402.66 MPa, and the strength utilization rate of the material was 94.9%; the failure mode of fiber was also related to the fiber type. The end-hooked fiber is more prone to fracture than the straight circular fiber. The research of this paper can provide a reference for further improving the mechanical properties of steel fiber reinforced ultra-high performance concrete.
袁明, 朱海乐, 颜东煌, 袁晟, 黄练, 刘昀. 钢纤维埋深与类型影响钢纤维-UHPC基体界面粘结性能的试验研究[J]. 材料导报, 2023, 37(16): 22010230-9.
YUAN Ming, ZHU Haile, YAN Donghuang, YUAN Sheng, HUANG Lian, LIU Yun. Experimental Study on the Effect of Steel Fiber Embedment Depth and Type on the Interfacial Bonding Properties of Steel Fiber-UHPC Matrix. Materials Reports, 2023, 37(16): 22010230-9.
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2023, Vol. 37 
