铣削型钢纤维与超高性能混凝土的界面粘结性能研究

doi:10.11896/cldb.22020028

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Abstract The excellent performance of ultra-high performance concrete (UHPC) mainly depends on the cooperative work between steel fiber and matrix. In order to study the applicability of milling steel fiber in UHPC, the bonding properties between milling steel fiber and UHPC was investigated by steel fibers pullout experiment. Meanwhile, copper coated microfilament steel fiber were used for comparison. The influence and mechanism of four factors (i.e., fiber buried depth, hooked-end, matrix fiber and curing system) on the bonding properties between milling steel fiber and UHPC were analyzed. The result of experiment indicated that the bonding strength of steel fibers (i.e., straight 'S', hooked-end 'H', milling straight 'MS' and milling ‘MH' steel fibers) in UHPC is in the order of H＞MH＞MS＞S. With the increase of fiber buried depth, the bonding strength of S, H and MS steel fiber in UHPC decreases, and MH steel fiber increases by the contrary. The hooked-end is helpful to improve the bonding strength and pullout energy of steel fiber in UHPC, and affects the shape of pullout load-displacement curve. Adding 2vol% steel fiber into the matrix can also slightly improve the bonding strength and pullout energy of steel fiber in UHPC. The bonding strength with standard curing system is lower than that with steam curing system, but it also makes the pullout behavior of milling steel fiber more obvious and improves the pullout energy. The bonding strength between milling steel fiber and UHPC is high, but its low fiber tensile strength affects the bonding perfor-mance. It is suggested to develop high-strength milling steel fiber suitable for UHPC.

Key words： UHPC milling steel fiber copper plated steel fiber bonding performance of the interface

Published: 25 February 2023 Online: 2023-03-02

CLC number:

TU528

Fund:Water Resource Science and Technology Innovation Program of Guangdong Province(2017-22),Provincial Under- graduate Training Programs for Innovation and Entrepreneurship of South China University of Technology(S202010561255),Qingyuan Science and Technology Plan Project of Guangdong Province(2020KJJH014).

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	Articles by authors
	YANG Yibo
	XIA Yinggan
	LIU Shaokun
	XIAO Qifeng
	GUO Wenying
	WANG Hengchang

Cite this article:

YANG Yibo,XIA Yinggan,LIU Shaokun, et al. Interfacial Bond Performance Between Milling Steel Fiber and Ultra-high Performance Concrete[J]. Materials Reports, 2023, 37(4): 22020028-9.

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http://www.mater-rep.com/EN/10.11896/cldb.22020028 OR http://www.mater-rep.com/EN/Y2023/V37/I4/22020028

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