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Geosciences 2013, 3(1), 30-45; doi:10.3390/geosciences3010030
Technical Note

Hydrophobization by Means of Nanotechnology on Greek Sandstones Used as Building Facades

1,* , 2
Received: 2 November 2012 / Revised: 8 January 2013 / Accepted: 9 January 2013 / Published: 18 January 2013
(This article belongs to the Special Issue Geoscience of the Built Environment)
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Modern sustainable architecture indicates the use of local natural stones for building. Greek sandstones from Epirus (Demati, Greece, EN 12440) used as building facades meet aesthetic and have high mechanical properties, but the inevitable interaction between stone materials and natural or anthropogenic weathering factors controls the type, and extent of stone damages. In the present paper, samples of sandstone were treated with a conventional hydrophobic product and four solutions of the same product, enriched with nanosilica of different concentrations. The properties of the treated samples, such as porosity and pore size distribution, microstructure, static contact angle of a water droplet, and durability to deterioration cycles (freeze-thaw) were recorded and conclusions were drawn. The research indicates the increased hydrophobic properties in nanosilica solutions but also the optimum content in nanoparticles that provides hydrophobicity without altering the properties of the stone.
Keywords: sandstone; hydrophobicity; nanosilica sandstone; hydrophobicity; nanosilica
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Stefanidou, M.; Matziaris, K.; Karagiannis, G. Hydrophobization by Means of Nanotechnology on Greek Sandstones Used as Building Facades. Geosciences 2013, 3, 30-45.

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