International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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Volume XLIV-M-1-2020
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLIV-M-1-2020, 1017–1024, 2020
https://doi.org/10.5194/isprs-archives-XLIV-M-1-2020-1017-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLIV-M-1-2020, 1017–1024, 2020
https://doi.org/10.5194/isprs-archives-XLIV-M-1-2020-1017-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  24 Jul 2020

24 Jul 2020

LIKE-FOR-LIKE AND COMPATIBLE MORTARS FOR THE REPAIR OF TRADITIONAL BUILDINGS

Nigel Copsey Nigel Copsey
  • Dept. of Archaeology, University of York. Hall Farm, Maltongate, Thornton Dale, North Yorkshire, YO18 7SA, UK

Keywords: Earth-lime, Hot mixed air lime, Natural hydraulic lime, Like-for-like, Compatible, Effective porosity

Abstract. The subject of this paper is traditional mortar preparation and materials, particularly earth-lime and air or feebly hydraulic hot mixed lime mortars with particular emphasis upon British practice and experience, whilst stressing their international ubiquity historically. It will demonstrate their appropriate functional performance and attest to the need to use similar mortars, similarly composed and prepared, in the repair and conservation of traditionally constructed buildings. It will question how commonly modern Natural Hydraulic Limes may be considered to be like-for-like or of compatible strength and functional performance. The paper will draw upon extensive research into historic texts, as well as primary archive research into historic building accounts and the latest research into the properties of lime rich air lime mortars and NHL mortars.