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Effect of age and level of damage on the autogenous healing of lime mortars

De Nardi, C., Cecchi, A., Ferrara, L., Benedetti, A. and Cristofori, D. 2017. Effect of age and level of damage on the autogenous healing of lime mortars. Composites Part B: Engineering 124 , pp. 144-157. 10.1016/j.compositesb.2017.05.041

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Natural hydraulic lime-based mortars are recommended for retrofitting operations in historical buildings, primarily because of their high chemical, physical and mechanical compatibility with the existing ones; moreover, their autogenous and engineering self-healing capacities make them a more suitable material for the aforementioned interventions. This work proposes a methodology to quantify the autogenous self-healing in terms of recovery of the compression strength and ultrasonic pulse velocity in samples made of natural hydraulic lime mortars; specimens were pre-cracked at different ages (14–84 days) and levels of damage (70% of the compression strength in pre-peak regime; 90% of the compression strength in post-peak regime), and then cured under water up to 28 days. The capacity of healing after two loading/healing cycles has been also investigated. An interdisciplinary approach has been pursued characterising the mechanical aspects of the healing and the chemical nature of the products via SEM/EDS analyses. The results provide useful indication about the dependence of the self-healing capacity on the aforementioned variables.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Elsevier
ISSN: 1359-8368
Date of Acceptance: 13 May 2017
Last Modified: 23 Feb 2021 08:17

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