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Coatings 2018, 8(3), 103; https://doi.org/10.3390/coatings8030103

Study of Calcium Ethoxide as a New Product for Conservation of Historical Limestone

1
Department of Molecular Science and Nanosystem, Ca’ Foscari University of Venice, 30170 Venezia Mestre, Italy
2
Department of Environmental Sciences, Informatics and Statistics, Ca’ Foscari University of Venice, Via Torino 155, 30170 Venezia Mestre, Italy
3
ICMATE, Istituto di Chimica della Materia Condensata e di Tecnologie per l’Energia, CNR, Area della Ricerca di Padova, Corso Stati Uniti 4, 35127 Padova, Italy
4
National Laboratory of Civil Engineering, Avenida do Brasil, 101, 1700-066 Lisbon, Portugal
*
Author to whom correspondence should be addressed.
Received: 20 February 2018 / Revised: 7 March 2018 / Accepted: 12 March 2018 / Published: 13 March 2018
(This article belongs to the Special Issue Communications from TechnoHeritage 2017)
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Abstract

The combination of multiple physical, chemical and biological factors causes the weathering of limestone used in the field of cultural heritage. To overcome the limitations of traditional consolidating products and to meet the requirements of the historical building substrates, during the European collaborative project NANOMATCH, alkaline earth alkoxides were developed and studied as consolidating agents for limestone. Among these new products, calcium ethoxide, with the formula Ca(OEt)2, was chosen for this study and investigated in depth as an alternative consolidating treatment. It was first characterized through a study of the carbonation process: its kinetics, reaction pathway and the evaluation of formed mineralogical phases. Subsequently, it was applied on limestones with different total open porosity to test its performance as a consolidating agent. The compatibility and the efficiency of the treatment were investigated with a multi-technique approach and compared with results obtained with a reference product, based on nanolime. This study indicates that calcium ethoxide shows better results with respect to the reference product, both in terms of compatibility and consolidation effect. View Full-Text
Keywords: calcium ethoxide; calcium alkoxide; calcium carbonate polymorphs; consolidation treatment; limestone; consolidation effectiveness; colorimetry; microdrilling; ultrasonic velocity calcium ethoxide; calcium alkoxide; calcium carbonate polymorphs; consolidation treatment; limestone; consolidation effectiveness; colorimetry; microdrilling; ultrasonic velocity
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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. (CC BY 4.0).

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Zuena, M.; Tomasin, P.; Costa, D.; Delgado-Rodrigues, J.; Zendri, E. Study of Calcium Ethoxide as a New Product for Conservation of Historical Limestone. Coatings 2018, 8, 103.

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