卜良桃, 徐博煜. 超高性能RPC钢筋网加固混凝土界面粘结性能试验研究[J]. 工程力学, 2022, 39(11): 123-132. DOI: 10.6052/j.issn.1000-4750.2021.06.0469
引用本文: 卜良桃, 徐博煜. 超高性能RPC钢筋网加固混凝土界面粘结性能试验研究[J]. 工程力学, 2022, 39(11): 123-132. DOI: 10.6052/j.issn.1000-4750.2021.06.0469
BU Liang-tao, XU Bo-yu. EXPERIMENTAL STUDY ON INTERFACIAL BONDING PERFORMANCE OF REACTIVE POWDER CONCRETE STRENGTHENED WITH BAR MESH[J]. Engineering Mechanics, 2022, 39(11): 123-132. DOI: 10.6052/j.issn.1000-4750.2021.06.0469
Citation: BU Liang-tao, XU Bo-yu. EXPERIMENTAL STUDY ON INTERFACIAL BONDING PERFORMANCE OF REACTIVE POWDER CONCRETE STRENGTHENED WITH BAR MESH[J]. Engineering Mechanics, 2022, 39(11): 123-132. DOI: 10.6052/j.issn.1000-4750.2021.06.0469

超高性能RPC钢筋网加固混凝土界面粘结性能试验研究

EXPERIMENTAL STUDY ON INTERFACIAL BONDING PERFORMANCE OF REACTIVE POWDER CONCRETE STRENGTHENED WITH BAR MESH

  • 摘要: 针对现有混凝土加固技术导致的耐久性弱、承载力低的问题,该文基于活性粉末混凝土钢筋网加固混凝土技术(Technical for strengthening concrete structures with reactive powder concrete and bar mesh, RPCBM),展开了双面剪切试验。该文评估了各试件的抗剪强度、破坏形态与荷载位移曲线,系统性地探讨了粗糙度、植筋率、钢筋网规格对RPCBM加固旧混凝土结构界面剪切性能的影响。结果表明:RPCBM加固混凝土结构的界面抗剪强度和延性提升幅度较大,具有良好的粘结性能。在一定范围内,随着粗糙度增大,粘结界面抗剪强度提高;植筋率增高,抗剪强度与延性增强;钢筋网规格是改善界面延性的重要因素。在此基础上,为了更好地计算RPCBM加固混凝土的界面粘结强度,该文基于以上数据建立了粘结界面抗剪强度的模型,提出了综合计算RPCBM加固普通混凝土(Ordinary Concrete, OC)界面抗剪强度的公式,试验结果与理论分析吻合较好,为工程实践中加固材料的选择和改进施工方法提供了理论依据。

     

    Abstract: To solve the problems of weak durability and low bearing capacity of current concrete strengthening technology, double shear tests were conducted based on the technical for strengthening concrete structures with reactive powder concrete and bar mesh (RPCBM). The shear strength, failure mode and load-displacement curve of each specimen were evaluated, and the effects of roughness, pin rate and bar mesh specification on the interfacial stress strength of RPCBM reinforced old concrete structure were discussed . The results show that the shear strength and ductility of RPCBM reinforced concrete structure are greatly improved, and the interface has good bonding performance. Within a certain range, the shear strength of bonding interface increases with the increase of roughness; the shear strength and ductility increase with the increase of pin rate. In addition, the bar mesh specification is an important factor for improving the interface ductility. The shear strength model of bonding interface was established to calculate the interface bond strength of RPCBM reinforced concrete. The shear strength formula of RPCBM reinforced ordinary concrete (OC) interface was proposed, and the test results were consistent with the theoretical analysis, which provides a theoretical basis for the selection of reinforcement materials and improvement of construction methods in engineering practice.

     

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