Print Email Facebook Twitter Characterization and compatibility assessment of commercial stone repair mortars Title Characterization and compatibility assessment of commercial stone repair mortars Author Lubelli, B. (TU Delft Heritage & Technology) Nijland, Timo G. (TNO) van Hees, R.P.J. (TU Delft Heritage & Technology; TNO) Date 2021 Abstract Compatibility of repair materials in conservation is a widely desired goal, but difficult to achieve. In this research, the compatibility of four commercial stone repair mortars, commonly used in conservation practice in the Netherlands and neighbouring countries, is discussed. In order to do so, they have been characterized in laboratory. The composition of the repair mortars, their content of soluble salts, porosity and pore size distribution, hygric dilation and flexural and compressive strength were measured. The effect of curing was assessed by comparing specimens cured in laboratory and under outdoor conditions. The effect of 3 years outdoor exposure on the curing and weathering of the mortars was evaluated. The results show that the composition of the selected mortars varies significantly, even though, based on their technical information sheets, they appeared to be similar. Consequently, their moisture transport properties differ significantly. As expected, both the type of binder and the porosity were shown to affect the mechanical properties of the mortar: the mortar based on an inorganic polymer binder showed the highest mechanical strength; the most porous, lime- or lime-cement-based mortars, showed the lowest mechanical strength. Based on compatibility criteria defined in literature and the results obtained in this research, an attempt was made to assess the technical compatibility of the selected mortars with building stones commonly used in the Netherlands. It was found that some requirements are hard to be fulfilled and not all requirements can be fulfilled at the same time. Besides, technical sheets of commercial mortars are often incomplete; therefore repair mortars can hardly be selected based only on the properties reported by the producers. Subject CompatibilityMicrostructurePorosityStone repair mortarsStrength To reference this document use: http://resolver.tudelft.nl/uuid:390e81d4-175b-42b7-8867-8a8dc76b9719 DOI https://doi.org/10.1016/j.culher.2021.02.001 ISSN 1296-2074 Source Journal of Cultural Heritage, 49, 174-182 Part of collection Institutional Repository Document type journal article Rights © 2021 B. Lubelli, Timo G. Nijland, R.P.J. van Hees Files PDF 1_s2.0_S1296207421000303_main.pdf 3.22 MB Close viewer /islandora/object/uuid:390e81d4-175b-42b7-8867-8a8dc76b9719/datastream/OBJ/view