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Geosciences 2016, 6(2), 23;

Crushed and River-Origin Sands Used as Aggregates in Repair Mortars

Laboratory of Building Materials, Civil Engineering Department, Aristotle University of Thessaloniki (AUTH), Thessaloniki 54124, Greece
Academic Editors: Carlos Alves and Jesus Martinez-Frias
Received: 21 January 2016 / Revised: 21 March 2016 / Accepted: 6 April 2016 / Published: 13 April 2016
(This article belongs to the Special Issue Geoscience of the Built Environment 2016 Edition)
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The systematic analysis of mortars from monuments or historic buildings and the simultaneous study of the construction environment show that it was common practice to use naturally occurring sand from local rivers or streams for the production of the mortars. There are cases though, mainly on islands, where sands of natural origin were limited, and marine or crushed sands were used possibly after elaboration. In all cases the particle size analysis of old mortar confirms the presence of even distribution of the granules. As regards the design of the repair mortars, there are criteria that should be taken into consideration in order to produce materials with compatible properties. The main properties concerning sands are the grain distribution and maximum size, the color, the content of fines, and soluble salts. The objective of this research is the study of the physical characteristics of the sands such as the sand equivalent, the gradation, the apparent density, the morphology of the grains, their mineralogical composition and the influence of these properties on the behavior of lime mortars, notably the mechanical and physical properties acquired. View Full-Text
Keywords: river sand; crushed sand; lime mortars; microstructure; strength river sand; crushed sand; lime mortars; microstructure; strength

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Stefanidou, M. Crushed and River-Origin Sands Used as Aggregates in Repair Mortars. Geosciences 2016, 6, 23.

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