Experimental Research on the Shear Property of Interfacial Bonding Between UHPC and Stone
MA Xinglin1,2, YANG Jun1,2,3,*, ZHOU Jianting1,2, WANG Jieyun3, ZHANG Zhongya1,2, SU Hao2, WANG Zongshan2
1 State Key Laboratory of Mountain and Tunnel Engineering, Chongqing Jiaotong University, Chongqing 400074, China 2 School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China 3 Guangxi Communications Investment Group Corporation Ltd.,Nanning 530022, China
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.
马兴林, 杨俊, 周建庭, 王劼耘, 张中亚, 苏昊, 王宗山. UHPC与石材的粘结界面抗剪性能试验研究[J]. 材料导报, 2022, 36(24): 21070133-7.
MA Xinglin, YANG Jun, ZHOU Jianting, WANG Jieyun, ZHANG Zhongya, SU Hao, WANG Zongshan. Experimental Research on the Shear Property of Interfacial Bonding Between UHPC and Stone. Materials Reports, 2022, 36(24): 21070133-7.
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2022, Vol. 36 
