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dc.contributor.author Zerbino, Raul Luis
dc.contributor.author Giaccio, Graciela Marta
dc.contributor.author Marfil, Silvina Andrea
dc.date.available 2018-01-15T18:17:18Z
dc.date.issued 2014-11
dc.identifier.citation Zerbino, Raul Luis; Giaccio, Graciela Marta; Marfil, Silvina Andrea; Evaluation of alkali–silica reaction in concretes with natural rice husk ash using optical microscopy; Elsevier; Construction And Building Materials; 71; 11-2014; 132-140
dc.identifier.issn 0950-0618
dc.identifier.uri http://hdl.handle.net/11336/33270
dc.description.abstract The use of rice husk ash as a supplementary cementing material is of great interest to many developing countries where rice production is in abundance. A highly reactive pozzolan is obtained when rice husk ash is burnt under controlled conditions. Previous work showed that it is possible to use residual rice husk ash “as nature” (natural rice husk ash). Nevertheless, it was observed that the incorporation of natural rice husk ash implies risks of expansions and mechanical degradation due to the reactions with alkalis. Based on the performance of slab prototypes placed outdoors during more than 3 years, this work analyzes the causes and the damage processes involved in the development of expansions in presence of natural rice husk ash. Optical microscopy observations on thin sections; crack patterns of the slabs and the strength and surface strain evolution along the time were evaluated. Visual and microscope observations showed clear signs of damage due to expansive reactions in concretes incorporating natural rice husk ash when high alkalis contents are available; although not gel was found, numerous cracks and voids were observed close to unburned rice husk particles, as well as high expansions and significant decreases in strength and stiffness. In concretes with alkalis contents lower than 3 kg/m3, even with the same percentages of natural rice husk ash, there were no significant decreases in the mechanical properties.
dc.format application/pdf
dc.language.iso eng
dc.publisher Elsevier
dc.rights info:eu-repo/semantics/restrictedAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject Cement
dc.subject Concrete
dc.subject Mechanical properties
dc.subject Microscopy
dc.subject Rice-husk ash
dc.subject.classification Ingeniería de los Materiales
dc.subject.classification Ingeniería de los Materiales
dc.subject.classification INGENIERÍAS Y TECNOLOGÍAS
dc.title Evaluation of alkali–silica reaction in concretes with natural rice husk ash using optical microscopy
dc.type info:eu-repo/semantics/article
dc.type info:ar-repo/semantics/artículo
dc.type info:eu-repo/semantics/publishedVersion
dc.date.updated 2018-01-15T17:35:13Z
dc.journal.volume 71
dc.journal.pagination 132-140
dc.journal.pais Países Bajos
dc.journal.ciudad Amsterdam
dc.description.fil Fil: Zerbino, Raul Luis. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata; Argentina. Laboratorio de Entrenamiento Multidisciplinario para la Investigación Tecnológica. La Plata; Argentina
dc.description.fil Fil: Giaccio, Graciela Marta. Universidad Nacional de La Plata; Argentina. Laboratorio de Entrenamiento Multidisciplinario para la Investigación Tecnológica. La Plata; Argentina
dc.description.fil Fil: Marfil, Silvina Andrea. Universidad Nacional del Sur; Argentina
dc.journal.title Construction And Building Materials
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.conbuildmat.2014.08.022
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0950061814009337
dc.conicet.fuente individual


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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)