单一及混杂网格增强聚合物砂浆的单轴拉伸性能

    Uniaxial Tensile Performance of Polymer Mortar Enhanced by Single and Hybrid Mesh

    • 摘要: 纤维网格增强砂浆(textile reinforced mortars, TRM)是一种由纤维网格与砂浆组成的新型复合材料, 作为纤维增强聚合物(fiber reinforced polymer, FRP)在加固领域的替代品, 克服了FRP用于加固时的缺陷。TRM表现出多裂缝特征, 在拉伸下具有高强度和高变形能力。为了解决不同种类纤维网格混杂以及添加钢丝网TRM拉伸性能研究不足的问题, 通过单轴拉伸试验, 研究了碳纤维网格、玻璃纤维网格、碳-玻璃纤维网格混杂以及纤维网格-钢丝网混杂增强聚合物砂浆拉伸性能的影响。试验参数包括纤维网格种类、纤维网格的配网率和不同种类网格的混杂。试验结果表明: 单一碳纤维网格对TRM试件峰值强度提高显著, 但对变形能力提升较差; 单一玻璃纤维网格对TRM试件的峰值应变提升显著, 但对峰值强度的提高幅度较低; 混杂碳-玻璃纤维网格可以充分发挥碳纤维网格对峰值强度提高显著和玻璃纤维网格对峰值应变提升显著的优点; 与单一碳及玻璃纤维网格比较, 碳及玻璃纤维网格与钢丝网混杂, 有利于提高TRM试件的变形能力, 具有良好的峰后持荷能力。基于试验数据, 提出了TRM抗拉强度计算公式, 建立了TRM拉伸应力-应变关系式。

       

      Abstract: Textile reinforced mortars (TRM) is an innovative composite material consisting of fiber mesh and mortar as an alternative to fiber reinforced polymer (FRP) in the field of reinforcement, overcoming the shortcomings of FRP reinforcement. TRM exhibits multi-cracking characteristics, high strength and high deformation capacity under tension. To address the issue of insufficient research on the tensile properties of polymer mortar enhanced by hybrid fiber mesh and the addition of the steel wire mesh, the effects of tensile properties of polymer mortar reinforced with carbon fiber mesh, glass fiber mesh, carbon-glass fiber mesh hybrid, and fiber mesh-wire mesh hybrid weve investigated by uniaxial tensile tests. Test parameters included fiber mesh type, mesh ratio of fiber mesh and mixing methods of different mesh types. The test results show that the single carbon fiber mesh improves the peak strength of TRM specimens significantly, but poorly improves the deformability; the single glass fiber mesh improves the peak strain of TRM specimens significantly, but improves the peak strength at a lower level; the hybrid carbon-glass fiber mesh can give full play to the advantages of the carbon fiber mesh for the significant improvement of the peak strength and the glass fiber mesh for the significant improvement of the peak strain; compared with single carbon or glass fiber mesh, the hybrid of carbon or glass fiber mesh and steel wire mesh is conducive to improving the deformation capacity of TRM specimens with good post-peak load holding capacity. Based on the experimental data, the equation for calculating the tensile strength of TRM was proposed, and the tensile stress-strain relationship equation of TRM was established.

       

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