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Experimental procedures for the mechanical characterization of composite reinforced mortar (CRM) systems for retrofitting of masonry structures

机译：复合增强砂浆（CRM）系统改装砌体结构改装的实验程序

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摘要

Fiber-reinforced composites can be arranged in the form of bi-dimensional grids and employed as internal reinforcement of mortar plasters to realize composite reinforced mortar (CRM) systems. Recently, CRM were applied as externally bonded reinforcement of existing masonry members showing promising improvements of load-carrying and deformation capacities. However, since CRM systems are still in their infancy, limited research is available regarding their mechanical properties and their bond behavior with respect to masonry substrates. In this paper, a series of experimental tests are performed on a CRM system comprising a glass fiber-reinforced composite grid and a lime-based matrix. Namely, tensile tests of bare grid yarns and of CRM coupons, shear tests of grid joints, and single-lap direct shear tests of CRM-masonry joints were performed. These tests are aimed at providing a comprehensive mechanical characterization of the CRM, which results can be used to design strengthening applications with this system. Namely, the tensile properties of bare grid yarns in warp and weft direction are obtained and compared with those of CRM coupons tested following the indications of the Italian and U.S. acceptance criteria for inorganic-matrix composites. Furthermore, the grid joints are subjected to shear tests to determine if the yarns orthogonal to the applied load direction provide a contribution to the system load-carrying capacity. Finally, CRM-masonry joints are subjected to single-lap direct shear tests to study the CRM bond behavior. This work provides an insight on the behavior of CRM that can be useful to formulate reliable design procedures for these systems.
机译：纤维增强复合材料可以以双向栅格的形式布置，并用作砂浆塑料的内部加强，以实现复合增强砂浆（CRM）系统。最近，CRM应用于现有砌体成员的外部粘合增强，显示出载荷和变形能力的有希望改善。然而，由于CRM系统仍处于初期阶段，因此有限的研究可用于其机械性能及其相对于砌体基材的粘合行为。在本文中，对包含玻璃纤维增​​强复合材料和基于石灰基质的CRM系统进行了一系列实验测试。即，进行裸栅纱线和CRM优惠券的拉伸试验，栅格接头的剪切试验，以及CRM-砌体关节的单圈直接剪切试验。这些测试旨在提供CRM的综合机械表征，该结果可用于设计强化本系统的应用。即，获得经线中裸栅纱线和纬纱方向的拉伸性质，并与在意大利和美国的指示下测试的CRM优惠券的抗拉性特性进行比较。用于无机矩阵复合材料的接受标准。此外，栅格接头经受剪切试验，以确定与施加的负载方向正交的纱线是否为系统承载能力提供了贡献。最后，CRM-砌体关节经受单圈直接剪切试验，以研究CRM键的行为。这项工作对CRM的行为提供了洞察，这对于为这些系统制定可靠的设计程序。

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  • 来源
    《Materials and structures》 |2020年第4期|94.1-94.18|共18页
  • 作者

    Tommaso DAntino; Angelo Savio Calabrese; Carlo Poggi;

  • 作者单位

    Department of Architecture Built Environment and Construction Engineering Politecnico di Milano Piazza Leonardo da Vinci 32 20133 Milan Italy;

    Department of Architecture Built Environment and Construction Engineering Politecnico di Milano Piazza Leonardo da Vinci 32 20133 Milan Italy;

    Department of Architecture Built Environment and Construction Engineering Politecnico di Milano Piazza Leonardo da Vinci 32 20133 Milan Italy;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Composite reinforced mortar (CRM); FRCM; TRM; Tensile tests; Bond tests;

    机译：复合增强砂浆（CRM）;FRCM;trm;拉伸试验;债券测试;

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