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Modified Ethylsilicates as Efficient Innovative Consolidants for Sedimentary Rock

1
J. Heyrovský Institute of Physical Chemistry of the CAS, Dolejskova 3, 18223 Prague, Czech Republic
2
Department of Physical Chemistry, University of Chemistry and Technology Prague, 16628 Prague, Czech Republic
3
TEP-243 Nanomaterials Group, Departamento de Química-Física, Facultad de Ciencias, Universidad de Cádiz, 11510 Puerto Real (Cádiz), Spain
*
Author to whom correspondence should be addressed.
Coatings 2019, 9(1), 6; https://doi.org/10.3390/coatings9010006
Received: 7 November 2018 / Revised: 3 December 2018 / Accepted: 12 December 2018 / Published: 22 December 2018
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Abstract

Although silicon alkoxides (especially ethylsilicates) have long been used as consolidants of weathered stone monuments, their physical properties are not ideal. In this study, an innovative procedure for the consolidation of sedimentary rocks was developed that combines the use of organometallic and alkylamine catalysts with the addition of well-defined nanoparticles exhibiting a narrow size distribution centered at ca. 10 nm. As a suitable test material, Pietra di Lecce limestone was selected because of its color and problematic physico-chemical properties, such as rather low hardness. Using the developed procedure, the mechanical and surface properties of the limestone were improved without the unwanted over-consolidation of the surface layers of the stone, and any significant deterioration in the pore size distribution, water vapor permeability, or the stone’s appearance. The developed modified ethylsilicates penetrated deeper into the pore structure of the stone than the unmodified ones and increased the hardness of the treated material. The formed xerogels within the stone pores did not crack. Importantly, they did not significantly alter the natural characteristics of the stone. View Full-Text
Keywords: ethylsilicates; consolidation; nanoparticles; physico-chemical properties ethylsilicates; consolidation; nanoparticles; physico-chemical properties
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Remzova, M.; Carrascosa, L.A.M.; Mosquera, M.J.; Rathousky, J. Modified Ethylsilicates as Efficient Innovative Consolidants for Sedimentary Rock. Coatings 2019, 9, 6.

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