Experimental Investigation on the Bond Behaviour of Basalt TRM Systems - Influence of Textile Configuration and Multi-Layer Application

Abstract

Textile Reinforced Mortars (TRM) include a series of innovative strengthening systems suitable for conservation interventions since inorganic matrixes, instead of polymeric resins, are employed. Recent research supported the definition of guidelines on testing methods for TRM systems applied to masonry, but further investigation is needed to clear out the role played by the numerous factors affecting the strengthening capacity. In this study, an experimental campaign on basalt-fibre TRM systems was carried out. A series of tensile and single-shear bond tests are compared. Samples differ for fibre reinforcement ratio, textile layout and the number of textile layers, while the lime-based mortar matrix is the same for all specimens. For tensile tests, results show that, after a mortar-cracking phase, a third, substantially linear phase, during which the textile response is dominant, occurred for specimens failed both for textile tensile rupture and textile slippage. For shear bond tests, results showed that increasing the reinforcement ratio tightening textile mesh is not as beneficial as increasing textile layers, i.e. active bond surfaces.

Experimental, analytical, and numerical investigations on bond behaviour of basalt TRM systems

“…First developed as fibre reinforced polymers (FRP) in other branches of applied technologies, lately, they have been introduced in the construction field (Kouris and Triantafillou, 2018;Gattesco and Boem, 2019). To overcome some significant drawbacks caused by the organic binder of FRP matrices -namely low resistance to high temperature, low vapour permeability and failure by delamination from the substrate, fibre reinforced cementitious mortars (FRCM) have been developed using loose mesh textiles and cement or lime-based mortars (Briccoli Bati et al, 2007;Rovero et al, 2013;Rotunno et al, 2015;Alecci et al, 2016;Misseri et al, 2019aMisseri et al, , 2019bKumar et al, 2019;Barducci et al, 2020;Misseri et al, 2020;Padalu et al, 2020;Boem and Gattesco, 2021), which ensure better compatibility with the masonry substrate. Gypsum based mortars proved also effective (Rovero et al, 2020;Misseri et al, 2021).…”

Experimental investigations on glass fibre reinforced composites with gypsum-earth matrix to strengthen the earth walls of the Noh-Gonbad Mosque in Balkh, Afghanistan

“…Different textile materials are used to implement the FRCM composite systems: glass, carbon, steel, PBO, basalt, and natural fibres (Barducci et al, 2020;Caggegi et al, 2017;Monaldo et al, 2019;Olivito et al, 2014) and different textile layouts are implemented, varying, for example, the size of the mesh, the type of knot between the weft and the warp and the treatment of the fibres, (Misseri et al, 2019b).…”

Experimental procedures for the mechanical characterization of composite reinforced mortar (CRM) systems for retrofitting of masonry structures

“…To overcome these issues, the organic resin can be replaced by inorganic binders and the continuum fiber sheet by open-mesh textiles to form inorganic-matrix composites usually referred to as fiber-reinforced cementitious matrix (FRCM) composites [8]. In FRCM composites, the inorganic matrix provides vapor permeability, protects the embedded textile from UV ray exposure, and is responsible for the stress-transfer mechanism between the composite and the substrate [9][10][11]. The reinforcing textiles can be made by various high-strength fibers, such as carbon, glass, basalt, polyparaphenylene benzobisoxazole (PBO), and steel, whereas cement-based, lime-based, and geopolymer matrices can be employed [12].…”