超高性能混凝土-普通混凝土界面粘结性能研究  

Study on Shear Bond Performance of UHPC-NC Interface

作　　者：王艳 常天风 杨子凡 李伊岚 WANG Yan;CHANG Tianfeng;YANG Zifan;LI Yilan(School of Materials Science and Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;State Key Laboratory of Green Building,Xi'an 710055,China)

机构地区：[1]西安建筑科技大学材料科学与工程学院,西安710055 [2]绿色建筑全国重点实验室,西安710055

出　　处：《材料导报》2025年第7期83-88,共6页Materials Reports

基　　金：国家优秀青年科学基金(52222806);陕西省杰出青年科学基金(2022JC-20)。

摘　　要：超高性能混凝土(UHPC)因其优异的力学与耐久性能在结构修复与加固领域具有显著的优势和巨大潜力,UHPC-普通混凝土(NC)界面粘结性能对于实现良好的加固效果至关重要。本工作基于斜剪试验,分析了UHPC强度和加固厚度对UHPC-NC界面粘结性能的影响。结果表明,UHPC与NC界面粘结性能优异,斜剪试件破坏形式多表现为NC破坏、界面和NC同时破坏。UHPC-NC界面粘结强度随着UHPC强度的提高而小幅度提升,UHPC强度等级从C100提升至C140,试件的界面粘结强度提升幅度在10.63%~14.66%之间;UHPC加固厚度对界面粘结强度影响更加显著,相较75 mm厚的试件,厚度为150 mm的试件的界面粘结强度最大可提高38%。基于试验结果建立了考虑UHPC-NC界面粗糙度、基体NC强度、UHPC强度和厚度的UHPC-NC界面抗剪强度计算公式,计算结果与试验结果吻合良好。Ultra-high performance concrete(UHPC)has significant advantages and great potential in the field of structural repair and reinforcement due to its excellent mechanical and durability properties.The bond performance of UHPC-normal concrete(NC)interface is very important for achieving a good reinforcement effect.Based on the oblique shear test,here analyzed the influence of UHPC strength and reinforcement thickness on the bond performance of UHPC-NC interface.The results show that the interface bond performance between post-cast UHPC and NC is excellent,and the failure modes of oblique shear specimens are mostly NC failure or simultaneous failure of interface and NC.The bond strength of UHPC-NC interface increases slightly with the increase of UHPC strength.The strength grade of UHPC increases from C100 to C140,and the interfacial bond strength of the specimen increases by 2.58 MPa(14.66%).The thickness of UHPC reinforcement has a more significant effect on the interfacial bond strength.The interfacial bond strength of the specimen with a thickness of 150 mm can be increased by 6.68 MPa(38%)compared with the specimen with a thickness of 75 mm.Based on the test results,a formula for calculating the shear strength of UHPC-NC interface considering the roughness of UHPC-NC interface,the strength of matrix NC,the strength and thickness of UHPC was established.The calculation results by the formula agree well with the test results.

关 键 词：超高性能混凝土 普通混凝土 斜剪试验 界面抗剪强度 荷载-滑移曲线 

分 类 号：TU528[建筑科学—建筑技术科学]