Electroprecipitation of Magnesium and Calcium Compounds for Weathering Protection of Ornamental Rocks

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dc.contributor.author Feijoo, Jorge
dc.contributor.author Fort, Rafael
dc.contributor.author Gómez Villalba, Luz Stella
dc.contributor.author Rabanal Jiménez, María Eugenia
dc.contributor.author Ottosen, Lisbeth M.
dc.date.accessioned 2022-07-14T08:18:47Z
dc.date.available 2022-07-14T08:18:47Z
dc.date.issued 2020-01-01
dc.identifier.uri http://hdl.handle.net/10016/35458
dc.description.abstract Electroprecipitation can be considered as a novel consolidation technique that can compete with commercial consolidation treatments since, it allows to reduce its accessible porosity, both superficially and in-depth; increasing considerably its mechanical properties and precipitating a compound chemically compatible with the material to be treated. The purpose of this study is to assess the effectiveness of the electroprecipitation of four different inorganic compounds constituted by Magnesium and Calcium Carbonate, Calcium Phosphate and Calcium Oxalate, in 6 cm thick specimens of quartz-arenite. The suitability of the treatment was assessed in samples treated and aged for 4 years under environmental conditions, comparing the changes caused in: structural properties (measuring the ultrasonic pulse velocity, anisotropy, tortuosity, pore size distribution, and mercury accessible porosity), mechanical properties (superficial hardness, uniaxial compressive strength and drilling resistance) and aesthetic properties (color). In addition, the morphology and composition of the compound precipitated were assessed by XRD and SEM-EDX. This study found that the precipitation of the insoluble compounds by this technique: I) takes place in a homogeneous way, reducing the anisotropy of the material and its tortuosity, which increases the durability of the material against the action of external agents, such as water, soluble salts, and pollutants. II) Increases the mechanical properties and causes a considerable increase in the ultrasonic wave transmission. III) Allows filling almost completely the pores where it precipitates, which reduces the damage risk caused by crystallization pressures. IV) Under these treatment conditions (environmental conditions, confined space and forced precipitation by an electric field), the precipitated phases were: Magnesite, Hydromagnesite, Calcite, Hydroxyapatite, and Wewhellite. However, the color changes detected indicate that it is necessary to carry out previous studies in the laboratory to reduce this aesthetic problem, before applying it on site on a certain material, especially in heritage constructions.
dc.description.sponsorship This research was funded by the Autonomous Region of Madrid's Top Heritage Programme (Grant S2018/NMT4372), the Innovation and Education Ministry (Reference MAT2016-80875-C3-3-R), and the Autonomous Region Program of Madrid (References S2013/MIT-2862 and S2018/NMT-4411). J.F.'s work is supported by the Ministerio de Ciencia Innovacion y Universidades, Spanish Government, through a Juan de la Cierva grant.
dc.format.extent 19
dc.language.iso eng
dc.rights © 2020 the authors
dc.rights Atribución-NoComercial-SinDerivadas 3.0 España
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.title Electroprecipitation of Magnesium and Calcium Compounds for Weathering Protection of Ornamental Rocks
dc.type article
dc.subject.eciencia Materiales
dc.identifier.doi 10.1021/acs.cgd.9b01497
dc.rights.accessRights openAccess
dc.relation.projectID Comunidad de Madrid. S2018/NMT4372
dc.relation.projectID Gobierno de España. MAT2016-80875-C3-3-R
dc.relation.projectID Comunidad de Madrid. S2013/MIT-2862
dc.relation.projectID Comunidad de Madrid. S2018/NMT-4411
dc.type.version submittedVersion
dc.identifier.publicationfirstpage 2337
dc.identifier.publicationissue 4
dc.identifier.publicationlastpage 2355
dc.identifier.publicationtitle Crystal Growth and Design
dc.identifier.publicationvolume 20
dc.identifier.uxxi AR/0000025670
dc.contributor.funder Comunidad de Madrid
dc.contributor.funder Ministerio de Ciencia, Innovación y Universidades (España)
dc.affiliation.dpto UC3M. Departamento de Ciencia e Ingeniería de Materiales e Ingeniería Química
dc.affiliation.grupoinv UC3M. Grupo de Investigación: Tecnología de Polvos
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