Experimental procedures for the mechanical characterization of composite reinforced mortar (CRM) systems for retrofittin
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ORIGINAL ARTICLE
Experimental procedures for the mechanical characterization of composite reinforced mortar (CRM) systems for retrofitting of masonry structures Tommaso D’Antino
. Angelo Savio Calabrese . Carlo Poggi
Received: 28 March 2020 / Accepted: 6 July 2020 The Author(s) 2020
Abstract Fiber-reinforced composites can be arranged in the form of bi-dimensional grids and employed as internal reinforcement of mortar plasters to realize composite reinforced mortar (CRM) systems. Recently, CRM were applied as externally bonded reinforcement of existing masonry members showing promising improvements of load-carrying and deformation capacities. However, since CRM systems are still in their infancy, limited research is available regarding their mechanical properties and their bond behavior with respect to masonry substrates. In this paper, a series of experimental tests are performed on a CRM system comprising a glass fiberreinforced composite grid and a lime-based matrix. Namely, tensile tests of bare grid yarns and of CRM coupons, shear tests of grid joints, and single-lap direct shear tests of CRM-masonry joints were performed. These tests are aimed at providing a comprehensive mechanical characterization of the CRM, which results can be used to design strengthening applications with this system. Namely, the tensile properties of bare grid yarns in warp and weft direction are obtained and compared with those of CRM coupons tested following the indications of the Italian and U.S. acceptance criteria for inorganic-matrix composites.
T. D’Antino (&) A. S. Calabrese C. Poggi Department of Architecture, Built Environment and Construction Engineering, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milan, Italy e-mail: [email protected]
Furthermore, the grid joints are subjected to shear tests to determine if the yarns orthogonal to the applied load direction provide a contribution to the system loadcarrying capacity. Finally, CRM-masonry joints are subjected to single-lap direct shear tests to study the CRM bond behavior. This work provides an insight on the behavior of CRM that can be useful to formulate reliable design procedures for these systems. Keywords Composite reinforced mortar (CRM) FRCM TRM Tensile tests Bond tests
1 Introduction The growing need of retrofitting existing masonry structures to preserve or extend their service life has been fostering the research of innovative and effective strengthening solutions. Among them, fiber-reinforced polymer (FRP) composites have been largely adopted as externally bonded reinforcement (EBR) to increase the load-carrying capacity of masonry members subjected to various loading configurations [1–6]. However, due to the use of polymer (organic) adhesives, FRP composites have low compatibility with masonry substrates and are hard to remove [7]. To overcome these issues, the organic resin can be replaced by inorganic binders and the continuum fiber sheet by open-mesh textiles to form inor
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