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 Civil Engineering Department, Aristotle University of Thessaloniki, Thessaloniki 56124, Greece 2 Chemical Engineering Department, Aristotle University of Thessaloniki, Thessaloniki 56124, Greece 3 "ORMYLIA" Foundation, Art Diagnosis Center, Sacred Convent of the Annunciation, Ormylia 63071, Chalkidiki, Greece
* Author to whom correspondence should be addressed.
Received: 2 November 2012; in revised form: 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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Abstract: 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

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MDPI and ACS Style

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

AMA Style

Stefanidou M, Matziaris K, Karagiannis G. Hydrophobization by Means of Nanotechnology on Greek Sandstones Used as Building Facades. Geosciences. 2013; 3(1):30-45.

Chicago/Turabian Style

Stefanidou, Maria; Matziaris, Katia; Karagiannis, Georgios. 2013. "Hydrophobization by Means of Nanotechnology on Greek Sandstones Used as Building Facades." Geosciences 3, no. 1: 30-45.

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