Experimental investigation on bond performance of UHPFRC wet joint by direct tension test

IF 3.4 3区 工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY Materials and Structures Pub Date : 2024-07-12 DOI:10.1617/s11527-024-02421-y
Haichun Li, Chuanxi Li, Yumei Wen, Zijian Zhu, Jiahao Peng, Siyang Li, Zheng Feng
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Abstract

Ultra-high-performance fiber-reinforced concrete (UHPFRC) is applied to joint nodes with its excellent mechanical properties, which helps to improve the force transfer performance of UHPFRC structures. The strength of the connections is dependent on the adhesion and friction between the connected materials in the bridge design procedure. This research aims to identify the adhesion performance between UHPFRC and UHPFRC under different interfacial roughening methods. To this end, the maximum tensile stress and the load–displacement curves of UHPFRC wet joints treated by high-pressure water jet roughening, uniform plastic formwork roughening, embedded wire mesh roughening, manual mechanical roughening, and epoxy resin were obtained via direct tension tests. The test results indicate that the bond strength of UHPFRC wet joints can reach 22.36%-68.06% of the tensile strength after different interfacial treatments, among which the roughening methods using high-pressure water jet significantly improve the bond performance of UHPFRC wet joints, followed by the roughing method of uniform plastic formwork and embedded steel wire mesh. Physical roughening treatment has less effect on the stiffness of UHPFRC wet joints and exhibits a typical brittle failure mode. A tensile constitutive model in the elastic phase of the UHPFRC wet joint interface and the simplified interfacial tensile stress-relative displacement model were proposed. Finally, the performance of the interfacial adhesion parameters was appraised by finite element modeling. The finite element analysis showed a good agreement with the experimental results.

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通过直接拉伸试验对超高压纤维水泥混凝土湿接缝的粘结性能进行实验研究
超高性能纤维增强混凝土(UHPFRC)以其优异的力学性能应用于连接节点,有助于提高 UHPFRC 结构的传力性能。在桥梁设计过程中,连接强度取决于连接材料之间的粘附力和摩擦力。本研究旨在确定不同界面粗化方法下 UHPFRC 和 UHPFRC 之间的粘附性能。为此,通过直接拉伸试验获得了高压水射流粗化、均匀塑料模板粗化、预埋钢丝网粗化、人工机械粗化和环氧树脂处理的 UHPFRC 湿接缝的最大拉伸应力和荷载-位移曲线。试验结果表明,经过不同界面处理后,超高压纤维增强混凝土湿接缝的粘结强度可达到抗拉强度的 22.36%-68.06% ,其中高压水射流粗化方法可显著改善超高压纤维增强混凝土湿接缝的粘结性能,其次是均匀塑料模板粗化方法和预埋钢丝网粗化方法。物理粗化处理对 UHPFRC 湿接缝刚度的影响较小,表现出典型的脆性破坏模式。提出了 UHPFRC 湿接缝界面弹性阶段的拉伸组成模型和简化的界面拉应力-相对位移模型。最后,通过有限元建模评估了界面粘附参数的性能。有限元分析结果与实验结果吻合良好。
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来源期刊
Materials and Structures
Materials and Structures 工程技术-材料科学:综合
CiteScore
6.40
自引率
7.90%
发文量
222
审稿时长
5.9 months
期刊介绍: Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.
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