Effect of Different Environmental Exposures on the Mechanical Behavior of Enhanced Carbon FRCM Systems
Jacopo Donnini, Francesca Bompadre, Valeria Corinaldesi
Appears on pages(s):
fabric-reinforced cementitious matrix (FRCM); carbon fibers; surface treatments; environmental exposure; durability
Fabric-reinforced cementitious matrix (FRCM) is a new class of composite materials that raised great interest in the last years as a promising technique to upgrade, strengthen and rehabilitate concrete or masonry structures. FRCM systems are constituted by a structural reinforcement fabric, consisting of an open grid of perpendicularly connected multifilament yarns (usually made of carbon, glass, or basalt fibers), applied on concrete or masonry structural elements through a cement- or lime-based matrix. In this study, the effects of using different surface treatments on dry carbon yarns have been evaluated, both considering mechanical performances and durability. Three different surface treatments have been investigated, the first two consisting of yarns pre-impregnation with epoxy resin or nano-silica coating while the third one is a process of fibers oxidation. Tensile tests on carbon yarns and pull-out tests have been carried out to evaluate the effects of the treatments both under normal environmental conditions and after artificial exposure in saline and alkaline environments.