UHPC与石材的粘结界面抗剪性能试验研究

doi:10.11896/cldb.21070133

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Abstract Due to the increase of load level, overweight vehicles, and peeling of masonry materials, many stone arch bridges in service is facing the problem of performance degradation. A new technology of using UHPC to repair and strengthen the stone arch bridges is proposed. In order to clarify the bonding performance of UHPC and stone interface, four groups of direct shear test components were designed while stones were selected from a stone arch bridge sited in Guizhou for 30 years, including single row planting reinforcement (ZJ1), double row planting reinforcement (ZJ2), single row planting reinforcement with steam curing (ZJ3), roughening (ZM). The effects of different bonding modes on the shear resistance of UHPC masonry stone were investigated. Results show that: the shear strength and bearing potential of the bonding interface between UHPC and stone are high. The ductility of the components can increase 17 times by the treatment of reinforcement; the interface of UHPC-stone specimen treated by chipping is the weak point of shear failure while the component with bars mainly broke as stone splitting; when the reinforcement planting rate of the interface is increased by 100%, the ultimate shear capacity of the interface can be increased by 392%; the steam maintenance of UHPC has a negative effect on the shear capacity of the interface, which leads to the reduction of shear capacity by 0.4 MPa; two suggestions can be put forward for the same type of optimization reinforcement by analyzing the stress transfer law in the loading process. One is to ensure the uniform and collaborative force of the interface by planting reinforcement, and the other is to consider strengthening configuration near the loading side to optimize the structural stress. Finally, the calculation formula of shear capacity of UHPC stone planting reinforcement interface is derived. The results show that the contribution of anchor bar deformation to the bond strength of the interface can be ignored.

Key words： bridge reinforcement direct shear test ultra high performance concrete (UHPC) stone

Published: Online: 2023-01-03

CLC number:

U448.22

Fund:National Natural Science Foundation for Young Scientists of China (51908093), the General Project of Nature Science Foundation of Chongqing (cstc2020jcyj-msxmX0088, cstc2020jcyj-bshX0007), the Science and Technology Project of Department of Transport of Hubei Province (2020-2-1-1, 2020-186-1-6), the Municipal Education Commission Project of Science and Technology Project for Young Scientists of Chongqing (KJQN201900733), China Postdoctoral Science Foundation (2021M693919), and Graduate Research and Innovation Fund of Chongqing Jiaotong University (2020B0004).

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	Articles by authors
	MA Xinglin
	YANG Jun
	ZHOU Jianting
	WANG Jieyun
	ZHANG Zhongya
	SU Hao
	WANG Zongshan

Cite this article:

MA Xinglin,YANG Jun,ZHOU Jianting, et al. Experimental Research on the Shear Property of Interfacial Bonding Between UHPC and Stone[J]. Materials Reports, 2022, 36(24): 21070133-7.

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http://www.mater-rep.com/EN/10.11896/cldb.21070133 OR http://www.mater-rep.com/EN/Y2022/V36/I24/21070133

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