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Practice paper

A comparative study into the performance of hot mixed and lime putty mortars with additions of metakaolin and brick dust pozzolans

Stephen Hetherington and Elizabeth Anne Laycock
Journal of Building Survey, Appraisal & Valuation, 8 (4), 309-325 (2020)
https://doi.org/10.69554/JRRI1511

Abstract

This paper explores the properties of mortars where the principle binder is calcium hydroxide. Two distinct forms of the binder were used: a ‘hot mix’ consisting of quicklime (calcium oxide), and a slaked and matured lime putty mortar. The modifications of properties exhibited by the two binders with and without the addition of pozzolans, brick dust and metakaolin were established. This study has relevance because of the lack of empirical data on the performance of modified mortars of these types. The experimental evaluation of properties including the mortar compressive and flexural strengths and the bond strengths obtained with brick demonstrated that although the hot mixed lime mortars expressed some advantages in terms of porosity over the putty-based counterparts, there is no significant difference in performance regardless of the pozzolan added.

Keywords: hot lime; lime putty; pozzolan; brick dust; metakaolin

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Author's Biography

Stephen Hetherington is senior lecturer and module leader for materials at Sheffield Hallam University. His role as senior lecturer requires him to design and deliver lectures and tutorials on modules in conservation studies, materials, science of materials, pathology and domestic construction technology. Stephen’s core research interests are in service performance of construction materials — namely their durability, repair and conservation. Recent external contract work has focused on the production of stone roofing slates and proprietary frost testing of historic masonry.

Elizabeth Anne Laycock is Professor of Stone Conservation at Sheffield Hallam University. She has a research interest in all aspects of masonry material performance and degradation. Elizabeth represents the UK on the European Standard CEN technical committee on the evaluation of methods and products for conservation works and is a member of the HECC. She is the module leader for the undergraduate cissertation module for the built environment.

Citation

Hetherington, Stephen and Laycock, Elizabeth Anne (2020, March 1). A comparative study into the performance of hot mixed and lime putty mortars with additions of metakaolin and brick dust pozzolans. In the Journal of Building Survey, Appraisal & Valuation, Volume 8, Issue 4. https://doi.org/10.69554/JRRI1511.

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cover image, Journal of Building Survey, Appraisal & Valuation
Journal of Building Survey, Appraisal & Valuation
Volume 8 / Issue 4
© Henry Stewart
Publications LLP

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