Abstract
Fiber-reinforced cementitious matrix (FRCM) and steel-reinforced grout (SRG) have been increasingly applied as externally bonded reinforcement to masonry members in the last few years. Unlike fiber-reinforced polymer (FRP), FRCM and SRG have good performance when exposed to (relatively) high temperature and good compatibility with inorganic substrates, and they can be applied to wet surfaces and at (reasonably) low temperatures. Although numerous studies investigated the mechanical properties and bond performance of various FRCM and SRG, new composites have been developed recently, and their performance still needs to be assessed. In this study, the bond behavior of three FRCM composites and one SRG composite applied to a masonry substrate is investigated. Sixteen single-lap direct shear tests (four tests for each composite) are performed. The FRCM studied comprised one layer of carbon, PBO (polyparaphenylene benzobisoxazole), or alkali-resistant (AR)-glass bidirectional textile embedded within two cement-based matrices. The SRG composite comprised one layer of a unidirectional stainless-steel cord textile embedded within a lime-based matrix. The results show a peculiar bond behavior and failure mode for each composite. Based on these results, the behavior of the carbon and PBO FRCM is modeled solving the bond differential equation with a trilinear cohesive material law (CML).
Highlights
The strengthening and retrofitting of existing concrete and masonry structures have attracted great attention in the last few decades
The first failure mode was debonding at the matrix–fiber interface (Dmf ), which was characterized by slippage of the textile within the matrix (Figure 3a)
The third failure mode was a mixed debonding at the matrix–fiber interface followed by fiber rupture (MDmf R, see Figure 3c)
Summary
The strengthening and retrofitting of existing concrete and masonry structures have attracted great attention in the last few decades. To improve the matrix–fiber bond behavior and allow the stress transfer between different layers of matrix, fiber sheets were replaced with open-mesh textiles [8]. This type of composite is usually referred to as fiber-reinforced cementitious matrix (FRCM), textilereinforced mortar (TRM) [8,9,10,11], or, when the textile comprises steel cords, steel-reinforced grout (SRG) [6,12,13]. In SRG composites, galvanized or stainless-steel cords are employed These cords are organized in unidirectional textiles and can have different spacing depending on the performance sought [6,8,23]. Due to the specific failure mode observed in AR-glass FRCMand SRG-masonry joints, the analytical procedure could not be performed
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