Externally bonded reinforcement (EBR), such as FRCM (Fiber-Reinforced Cementitious Matrix) and FRP (Fiber-Reinforced Polymer) composites, represents a solution to strengthen existing concrete or masonry elements. FRCMs were developed as an alternative to FRPs to mainly overcome the drawbacks associated with the inorganic binders. The studies report in literature showed that FRCMs are effective in increasing the axial, bending and shear capacity of concrete members, as well as the in-plane and out-of-plane capacity of masonry walls, and the capacity of masonry arches. As well known, the effectiveness of composite reinforced materials is influenced by the shear bond behaviour that can be developed between them and the substrate. The bond depends on many parameters, e.g. bond length, the mechanical properties of substrate, environmental conditions, etc. Differently from FRPs, for which the bond between fiber and resin is of chemical nature thanks to the polymerization process of organic matrix, the interaction between inorganic matrix and fibers is mostly mechanical. In fact, inorganic binders can hardly impregnate all fiber filaments, which leads to several types of debonding at the matrix fiber interface. In the literature, the matrix-fiber bond behaviour was studied using mostly single-and double-lap direct shear (DS) tests. The paper aims to furnish a contribution to the understanding of the general physical phenomena that characterize the mechanical behaviour of FRCM materials and their bond with masonry structures. Two types of substrates, Calcarenite and “Piera Leccese”, widely uses in southern Italy are considered reinforced with a basalt open mesh grid and two different inorganic binders.
EXPERIMENTAL STUDY ON BOND BETWEEN BASALT FRCM REINFORCEMENT AND CALCAREOUS STONE
Bramato G.;Leone M.;Perrone D.;Aiello M. A.
2022-01-01
Abstract
Externally bonded reinforcement (EBR), such as FRCM (Fiber-Reinforced Cementitious Matrix) and FRP (Fiber-Reinforced Polymer) composites, represents a solution to strengthen existing concrete or masonry elements. FRCMs were developed as an alternative to FRPs to mainly overcome the drawbacks associated with the inorganic binders. The studies report in literature showed that FRCMs are effective in increasing the axial, bending and shear capacity of concrete members, as well as the in-plane and out-of-plane capacity of masonry walls, and the capacity of masonry arches. As well known, the effectiveness of composite reinforced materials is influenced by the shear bond behaviour that can be developed between them and the substrate. The bond depends on many parameters, e.g. bond length, the mechanical properties of substrate, environmental conditions, etc. Differently from FRPs, for which the bond between fiber and resin is of chemical nature thanks to the polymerization process of organic matrix, the interaction between inorganic matrix and fibers is mostly mechanical. In fact, inorganic binders can hardly impregnate all fiber filaments, which leads to several types of debonding at the matrix fiber interface. In the literature, the matrix-fiber bond behaviour was studied using mostly single-and double-lap direct shear (DS) tests. The paper aims to furnish a contribution to the understanding of the general physical phenomena that characterize the mechanical behaviour of FRCM materials and their bond with masonry structures. Two types of substrates, Calcarenite and “Piera Leccese”, widely uses in southern Italy are considered reinforced with a basalt open mesh grid and two different inorganic binders.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
