RILEM TC 277-LHS report: lime-based mortars for restoration–a review on long-term durability aspects and experience from practice

Caspar Groot*, Rosario Veiga, Ioanna Papayianni, Rob Van Hees, Michele Secco, José I. Alvarez, Paulina Faria, Maria Stefanidou

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)
55 Downloads (Pure)


For conservation interventions of historic masonry generally lime-based mortars such as pure air lime mortars, lime-pozzolan mortars, natural hydraulic lime mortars and ternary mortars (lime-pozzolan-cement) are used. The main reason is that their hygric and mechanical (strength and ductility) performance are easy to adapt to most existing historic masonry (compatibility requirements). Although the basic appropriateness of lime-based mortars for restoration is undisputed, there are also some limitations in the application of these mortars. In this report a review is given of the theoretical backgrounds and further of laboratory research developments in the field of lime-based binders and mortars over the past decades. Furthermore, practical experiences in positive and negative sense (damage cases) are elaborated. Drawbacks and points of attention are being dealt with, which are essential for a durable application of lime-based mortars for the conservation of historic masonry. In general, it is concluded that points of attention should be addressed through a thorough evaluation of their potential and through testing of their suitability. For these mortars, even more than for modern cement-based mortars, specifically, environmental exposure conditions and application conditions should be considered.

Original languageEnglish
Article number245
JournalMaterials and Structures/Materiaux et Constructions
Issue number10
Publication statusPublished - 2022


  • Binding mechanism
  • Damage cases
  • Lime-based mortars
  • Long-term durability
  • Practice

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