Methods of testing systems for strengthening masonry structures based on cement composites reinforced with glass fiber mesh

The paper presents the testing methods used for the contemporary masonry strengthening system, FRCM (fibre-reinforced cementitious matrix), which consists of glass fabric and mortar matrix. The FRCM system is suitable for strengthening masonry structures since it doesn't significantly change their mass and stiffness but increases the capacity for certain loads, especially ones induced by earthquakes. Following the recommendations, the mechanical properties of component materials and three groups (fibers, fibers in mortar, and masonry system) of specimens were tested. The main parameters necessary for calculating this system were defined and compared with the results found in the literature. It was shown that the chosen geometry for the mechanical test was appropriate for comparing the results within different groups. The importance of the type of fixtures used for the specimens (clevis- or clamping-grip) was more pronounced in the second group of specimens. Results of the first and the third group of specimens were in accordance with the literature, with the ultimate tensile stress of the dry fabric reaching 742,2 MPa, and the ultimate tensile strain of the dry fabric reaching 1.53%.The conventional strain obtained from the third group of specimens was 1.28%.