Characterization of Fresh and Durability Properties of Different Lime Mortars for Being Used as Masonry Coatings in the Restoration of Ancient Constructions

Fernando G. Branco, Maria de Lurdes Belgas, Cátia Mendes, Luís Pereira and José Marcos Ortega
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Fernando G. Branco: ISISE, Department of Civil Engineering, University of Coimbra, 3030-788 Coimbra, Portugal
Maria de Lurdes Belgas: ISISE, Departamental Unit of Engineering, Instituto Politécnico de Tomar, 2300-313 Tomar, Portugal
Cátia Mendes: Instituto Politécnico de Tomar, 2300-313 Tomar, Portugal
Luís Pereira: ISISE, Department of Civil Engineering, University of Coimbra, 3030-788 Coimbra, Portugal
José Marcos Ortega: Departamento de Ingeniería Civil, Universidad de Alicante, 03080 Alacant/Alicante, Spain

Sustainability, 2021, vol. 13, issue 9, 1-16

Abstract: Coatings and plasters are an integral part of masonry cladding, having a fundamental protective and aesthetic function. They are exposed to numerous aggressive actions, which produce their degradation over time. The utilization of lime, as a binder in masonry lining mortars, plays an important role in their durability and conservation. The objective of this work is to analyze the fresh and durability properties of lime-based mortars for their application in the restoration of old buildings. Four different kinds of mortars were studied with similar workability, using as binders lime putty, aerial lime, and hydraulic lime. The aggregates used consisted of sand and crushed rock powder. As fresh properties, the consistency (by using the flow table) and water retentivity were determined. With respect to durability-related properties, water absorption by capillarity and by immersion, drying kinetics, and carbonation depth were studied. Bulk density and porosity of the mortars were also obtained. Mortars with lime putty showed higher global porosity and water absorption by immersion, while aerial lime mortars presented lower porosity and higher water absorption by capillarity. Finally, the durability performance of all the studied lime mortars was overall adequate for being applied as masonry coatings in the restoration of old buildings.

Keywords: coatings; plasters; mortars; lime putty; aerial lime; hydraulic lime; crushed rock powder; durability; masonry; rehabilitation (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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