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

doi:10.11896/cldb.22010230

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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.

Key words： bridge engineering ultra high performance concrete (UHPC) double fibers pull-out test steel fiber bonding properties fiber embedment depth

Published: 25 August 2023 Online: 2023-08-14

CLC number:

U444

Fund:National Natural Science Foundation of China (52078054, 52278141), Transportation Science and Technology Project of Hunan Province (201932), Natural Science Foundation of Hunan Province (2021jj30730), and Postgraduate Research and Innovation Project of Hunan Province (CX20200832, CX20190650).

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	Articles by authors
	YUAN Ming
	ZHU Haile
	YAN Donghuang
	YUAN Sheng
	HUANG Lian
	LIU Yun

Cite this article:

YUAN Ming,ZHU Haile,YAN Donghuang, et al. Experimental Study on the Effect of Steel Fiber Embedment Depth and Type on the Interfacial Bonding Properties of Steel Fiber-UHPC Matrix[J]. Materials Reports, 2023, 37(16): 22010230-9.

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http://www.mater-rep.com/EN/10.11896/cldb.22010230 OR http://www.mater-rep.com/EN/Y2023/V37/I16/22010230

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