Mechanical characterization of different FRCM systems for structural reinforcement

Abstract

This experimental work aims to evaluate the strengthening effectiveness as well as the mechanical behavior of different Fiber Reinforced Cementitious Matrix (FRCM) systems. The use of mortars with different strength classes coupled with fabrics made of carbon, basalt or PBO fibers has been investigated. In the case of both carbon and basalt fibers a polymer coating was also applied, in order to check the likely improved adhesion with mortars. These composite systems have been characterized by means of tensile and double shear bond tests. Tensile tests have been performed with clevis grips (AC434.13), by changing the contact length of the metal tabs used to grip the ends of the specimen, in order to understand the influence of the latter on the FRCM tensile characterization. Different bond lengths were analysed in double shear bond tests, using clay brick walls as substrate, so as to evaluate the influence of the bond length depending on the reinforcement system used. Carbon and PBO were also coupled with high-performance mortar so as to understand the effect of using high performance cementitious mortar as matrix for composite systems. Finally, FRCM performance and failure modes when reinforced with multiple carbon fabric plies have been investigated.