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      Lime-Based Mortar Reinforced by Randomly Oriented Short Fibers for the Retrofitting of the Historical Masonry Structure

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          Abstract

          Recent seismic events prompted research to develop innovative materials for strengthening and repair of both modern and historic masonry constructions (buildings, bridges, towers) and structural components (walls, arches and vaults, pillars, and columns). Strengthening solutions based on composite materials, such as the Fiber Reinforced Polymers (FRP) or the Fiber Reinforced Cementitious Matrix (FRCM), have been increasingly considered in the last two decades. Despite reinforcement made of short-fibers being a topic that has been studied for several years from different researchers, it is not yet fully considered for the restoration of the masonry construction. This work aims to experimentally investigate the enhancement of the mechanical properties of lime-based mortar reinforced by introducing short glass fibers in the mortar matrix with several contents and aspect ratios. Beams with dimensions of 160 mm × 40 mm × 40 mm with a central notch were tested in three-point bending configuration aiming to evaluate both the flexural strength and energy fracture of the composite material. Then, the end pieces of the broken beams were tested in Brazilian and compressive tests. All the tests were performed by a hydraulic displacement-controlled testing machine. Results highlight that the new composite material ensures excellent ductility capacity and it can be considered a promising alternative to the classic fiber-reinforcing systems.

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                Author and article information

                Journal
                Materials (Basel)
                Materials (Basel)
                materials
                Materials
                MDPI
                1996-1944
                06 August 2020
                August 2020
                : 13
                : 16
                : 3462
                Affiliations
                Department of Civil, Building and Environmental Engineering, University of L’Aquila, 67100 L’Aquila, Italy; michele.angiolilli@ 123456graduate.univaq.it (M.A.); marco.vailati@ 123456univaq.it (M.V.)
                Author notes
                [* ]Correspondence: amedeo.gregori@ 123456univaq.it ; Tel.: +39-0862-43-4141
                Author information
                https://orcid.org/0000-0002-7584-9485
                https://orcid.org/0000-0003-0267-0094
                https://orcid.org/0000-0002-5515-3894
                Article
                materials-13-03462
                10.3390/ma13163462
                7475860
                32781575
                0151cd5f-64ef-436e-bf1e-3f630df0c3c8
                © 2020 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 03 June 2020
                : 30 July 2020
                Categories
                Article

                cultural heritage,durability,mechanical characterization,retrofitting,strengthening,quasi-brittle material,three-point bending test,energy fracture,nhl,composite material

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