DURABILITY OF LIME BASED RENDERS: A REVIEW OF SOME DEGRADATION MECHANISMS AND ASSESSMENT TEST METHODS

Rosário Veiga, Maria Stefanidou, Kristin Balksten, José Ignacio Alvarez, Cristiana Nunes, Magdalini Theodoridou, Paulina Faria, Ioanna Papayianni, Rob van Hees

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

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Abstract

Lime based mortars used for the repair and renovation of old lime renders have important functions in historic buildings, such as the protection of the masonry and aesthetics of the surfaces. Hence, they have a significant contribution to the durability of the walls, which often are structural elements.
Cracking and loss of adherence are two of the most severe defects for renders, as they drastically affect their functional capacity. Cracking is related to shrinkage, elastic characteristics, and kinetics of the gain of strength as well as to water transport properties of the render. Most of these aspects are governed by the porous structure of the mortar, which is a function of the composition of the mix and application issues. Loss of adherence is related to the compatibility of the render with the substrate, concerning mechanical, thermal and hygric aspects. Loss of cohesion, due to leakage of the binder, freeze-thaw, salts crystallization or other causes, results in significant damage, difficult to repair. The appearance of stains either by pollutants deposition or by biocolonization is also a concern related to durability of renders.
In the present paper the degradation mechanisms leading to cracking, loss of adhesion or cohesion and stains formation are analysed based on literature, and a review of assessment test methods are carried out. Finally, the need for test improvement in this area is highlighted.
Original languageEnglish
Title of host publicationProceedings of the International Conference on Sustainable Materials, Systems and Structures (SMSS 2019): Durability, Monitoring and Repair of Structures
EditorsAna Baričević, Marija Jelčić Rukavina, Domagoj Damjanović, Maurizio Guadagnini
Place of PublicationParis
PublisherRILEM Publications SARL
ChapterVolume 3 - Durability, Monitoring and Repair of Structures
Pages629-636
Number of pages8
ISBN (Electronic)978-2-35158-218-3
ISBN (Print)978-2-35158-225-1
Publication statusPublished - 2019
EventInternational Conference on Sustainable Materials, Systems and Structures: RILEM International Spring Convention - Rovinj, Croatia
Duration: 18 Mar 201922 Mar 2019

Publication series

NameRILEM Proceedings
PublisherRILEM Publications SARL
Volume128

Conference

ConferenceInternational Conference on Sustainable Materials, Systems and Structures
Abbreviated titleSMSS 2019
CountryCroatia
CityRovinj
Period18/03/1922/03/19

Keywords

  • Lime render
  • Test method
  • Loss of adhesion
  • Cracking
  • Degradation mechanism

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