Bond behavior and tensile properties of FRCM composites applied on masonry panels

The presented experimental study is aimed at improving the knowledge about the tensile behavior and bond performance of FRCMs, in order to improve their effectiveness and suggest qualification methods before the application of these composite materials on masonry structures.Tensile tests and single-lap shear tests were performed on FRCM composites based on bi-directional carbon and glass grids and on natural hydraulic lime mortar. In order to improve the adhesion between fibers and matrix and to limit the possible slip between them, an adhesion promoter has been used. The application of Digital Image Correlation technique allowed to obtain complete displacement and strain maps on the surface of the specimens tested, both in tensile and bond tests. Experimental results show good performance of the strengthening systems, with some typical failure modes. The proposed test methods, which led to reliable results, could also provide useful suggestions for the standardization of materials qualification process.