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Research paper

Comparative testing of hydraulic lime and OPC mortar mixes

Stephen Hetherington
Journal of Building Survey, Appraisal & Valuation, 3 (3), 276-284 (2014)
https://doi.org/10.69554/CDOF7560

Abstract

In recent years there has been in increasing trend towards the use of hydraulic lime-based mortars within the construction industry, especially in low-rise domestic dwelling — due in part to their sustainable credentials. However, the construction industry has, until recent times, solely relied upon the use of Portland cement-based mortars and the introduction of lime-based mortars has added another dimension to the choice of binder and mortar specification to use. This limited comparative study is designed to clarify the relative merits of the two binder types in terms of their compressive strength, flexural strength, water absorption and porosity. The study was conducted using three different binder to aggregated designations: 1 part binder to 3 parts sand, 1 part binder to 6 parts sand and 1 part binder to 8 parts sand. The binder designations were chosen to give a range of different mortar types that are commonly used in the industry. A constant mass of aggregate was used and the proportion of ‘binder to be added’ calculated to give the desired ratios. This was done to enable greater control and consistency over the workability of each mix when adding the water.

Keywords: comparative study; hydraulic lime; Portland cement; compressive strength; flexural strength; porosity; water absorption

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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.

Citation

Hetherington, Stephen (2014, November 1). Comparative testing of hydraulic lime and OPC mortar mixes. In the Journal of Building Survey, Appraisal & Valuation, Volume 3, Issue 3. https://doi.org/10.69554/CDOF7560.

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cover image, Journal of Building Survey, Appraisal & Valuation
Journal of Building Survey, Appraisal & Valuation
Volume 3 / Issue 3
© Henry Stewart
Publications LLP

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