Natural-Fibrous Lime-Based Mortar for the Rapid Retrofitting of Heritage Masonry Buildings

The present work aims to define the mechanical behavior of a new composite material for the preservation and enhancement of the vast historical and architectural heritage particularly vulnerable to environmental and seismic actions. The new composite represents a novelty in the landscape of the fibr...

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Autores principales:	Marco Vailati, Micaela Mercuri, Michele Angiolilli, Amedeo Gregori
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	masonry composite short fibers natural hydraulic lime Sisal three-point bending test Chemicals: Manufacture, use, etc. TP200-248 Textile bleaching, dyeing, printing, etc. TP890-933 Biology (General) QH301-705.5 Physics QC1-999
Acceso en línea:	https://doaj.org/article/a1a9e4e896c64d3ca4c9a33acd7933ba
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spelling	oai:doaj.org-article:a1a9e4e896c64d3ca4c9a33acd7933ba2021-11-25T17:31:16ZNatural-Fibrous Lime-Based Mortar for the Rapid Retrofitting of Heritage Masonry Buildings10.3390/fib91100682079-6439https://doaj.org/article/a1a9e4e896c64d3ca4c9a33acd7933ba2021-10-01T00:00:00Zhttps://www.mdpi.com/2079-6439/9/11/68https://doaj.org/toc/2079-6439The present work aims to define the mechanical behavior of a new composite material for the preservation and enhancement of the vast historical and architectural heritage particularly vulnerable to environmental and seismic actions. The new composite represents a novelty in the landscape of the fibrous mortars and consists of natural hydraulic lime (NHL)-based mortar, strengthened by Sisal short fibers randomly oriented in the mortar matrix. The developed mortar ensures the chemical-physical compatibility with the original features of the historical masonry structures (especially in stone and clay) aiming to pursue the effectiveness and durability of the intervention. The use of vegetal fibers (i.e., the Sisal one) is an exciting challenge for the construction industry considering that they require a lower level of industrialization for their processing, and therefore, their costs are considerably lower, as compared to the most common synthetic/metal fibers. Samples of Sisal-composite are tested in three-point bending, aiming to estimate both their bending stress and fracture energy. Tensile and compressive tests were also performed on the composite samples, while water retention and slump test were performed on the fresh mix. At last, the tensile tests on the Sisal strand were performed to evaluate the tensile stress of both strand and wire. An original mechanical interpretation is proposed to explain two interesting phenomena that arose from the analysis of experimental data. The comparison among the performances of unreinforced and reinforced mortar suggests that the use of short fibers is recommendable as coating in the retrofitting interventions alternatively to the long uni or bi-directional fiber strands adopted in the classic fibrous reinforcement (i.e., FRCM). The proposed composite also ensures mix-independent great workability, excellent ductility, and strength, and it can be considered a promising alternative to the classic fiber-reinforcing systems. As final remarks, the use of fiber F1 (length of 24 mm) with respect to fiber F2 (length of 13 mm) is more recommendable in the retrofitting interventions of historical buildings, ensuring higher strength and/or ductility for the composite.Marco VailatiMicaela MercuriMichele AngiolilliAmedeo GregoriMDPI AGarticlemasonrycompositeshort fibersnatural hydraulic limeSisalthree-point bending testChemicals: Manufacture, use, etc.TP200-248Textile bleaching, dyeing, printing, etc.TP890-933Biology (General)QH301-705.5PhysicsQC1-999ENFibers, Vol 9, Iss 68, p 68 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	masonry composite short fibers natural hydraulic lime Sisal three-point bending test Chemicals: Manufacture, use, etc. TP200-248 Textile bleaching, dyeing, printing, etc. TP890-933 Biology (General) QH301-705.5 Physics QC1-999
spellingShingle	masonry composite short fibers natural hydraulic lime Sisal three-point bending test Chemicals: Manufacture, use, etc. TP200-248 Textile bleaching, dyeing, printing, etc. TP890-933 Biology (General) QH301-705.5 Physics QC1-999 Marco Vailati Micaela Mercuri Michele Angiolilli Amedeo Gregori Natural-Fibrous Lime-Based Mortar for the Rapid Retrofitting of Heritage Masonry Buildings
description	The present work aims to define the mechanical behavior of a new composite material for the preservation and enhancement of the vast historical and architectural heritage particularly vulnerable to environmental and seismic actions. The new composite represents a novelty in the landscape of the fibrous mortars and consists of natural hydraulic lime (NHL)-based mortar, strengthened by Sisal short fibers randomly oriented in the mortar matrix. The developed mortar ensures the chemical-physical compatibility with the original features of the historical masonry structures (especially in stone and clay) aiming to pursue the effectiveness and durability of the intervention. The use of vegetal fibers (i.e., the Sisal one) is an exciting challenge for the construction industry considering that they require a lower level of industrialization for their processing, and therefore, their costs are considerably lower, as compared to the most common synthetic/metal fibers. Samples of Sisal-composite are tested in three-point bending, aiming to estimate both their bending stress and fracture energy. Tensile and compressive tests were also performed on the composite samples, while water retention and slump test were performed on the fresh mix. At last, the tensile tests on the Sisal strand were performed to evaluate the tensile stress of both strand and wire. An original mechanical interpretation is proposed to explain two interesting phenomena that arose from the analysis of experimental data. The comparison among the performances of unreinforced and reinforced mortar suggests that the use of short fibers is recommendable as coating in the retrofitting interventions alternatively to the long uni or bi-directional fiber strands adopted in the classic fibrous reinforcement (i.e., FRCM). The proposed composite also ensures mix-independent great workability, excellent ductility, and strength, and it can be considered a promising alternative to the classic fiber-reinforcing systems. As final remarks, the use of fiber F1 (length of 24 mm) with respect to fiber F2 (length of 13 mm) is more recommendable in the retrofitting interventions of historical buildings, ensuring higher strength and/or ductility for the composite.
format	article
author	Marco Vailati Micaela Mercuri Michele Angiolilli Amedeo Gregori
author_facet	Marco Vailati Micaela Mercuri Michele Angiolilli Amedeo Gregori
author_sort	Marco Vailati
title	Natural-Fibrous Lime-Based Mortar for the Rapid Retrofitting of Heritage Masonry Buildings
title_short	Natural-Fibrous Lime-Based Mortar for the Rapid Retrofitting of Heritage Masonry Buildings
title_full	Natural-Fibrous Lime-Based Mortar for the Rapid Retrofitting of Heritage Masonry Buildings
title_fullStr	Natural-Fibrous Lime-Based Mortar for the Rapid Retrofitting of Heritage Masonry Buildings
title_full_unstemmed	Natural-Fibrous Lime-Based Mortar for the Rapid Retrofitting of Heritage Masonry Buildings
title_sort	natural-fibrous lime-based mortar for the rapid retrofitting of heritage masonry buildings
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/a1a9e4e896c64d3ca4c9a33acd7933ba
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Natural-Fibrous Lime-Based Mortar for the Rapid Retrofitting of Heritage Masonry Buildings

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