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.

中文翻译：

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用于砖石结构改造的复合增强砂浆 (CRM) 系统的力学特性试验程序

纤维增强复合材料可以以二维网格的形式排列，用作砂浆抹灰的内部增强，以实现复合增强砂浆（CRM）系统。最近，CRM 被用作现有砌体构件的外部粘合钢筋，显示出承载和变形能力的有希望的改进。然而，由于 CRM 系统仍处于起步阶段，关于它们的机械性能和它们与砖石基材的粘合行为的研究有限。在本文中，对包含玻璃纤维增​​强复合网格和石灰基基体的 CRM 系统进行了一系列实验测试。即，进行了裸网格纱线和 CRM 试样的拉伸试验、网格接头的剪切试验和 CRM 砌体接头的单搭接直剪试验。这些测试旨在提供 CRM 的综合力学特性，其结果可用于设计该系统的加固应用。即，根据意大利和美国对无机基复合材料的验收标准的指示，获得了经向和纬向的裸网格纱线的拉伸性能，并与测试的 CRM 试样的拉伸性能进行了比较。此外，对网格接头进行剪切​​测试，以确定与施加的载荷方向正交的纱线是否对系统承载能力有贡献。最后，对 CRM 砌体接头进行单搭直剪试验以研究 CRM 粘结行为。这项工作提供了对 CRM 行为的洞察，可用于为这些系统制定可靠的设计程序。