Critical aspects in the handling of reactive silica in cementitious materials: Effectiveness of rice husk ash vs nano-silica in mortar dosage

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Show simple item record Torres Carrasco, Manuel Jiménez Reinosa, Julián De La Rubia, Miguel Ángel Reyes Pozo, Encarnación Alonso Peralta, Francisco Fernández, José F. 2021-02-16T14:40:02Z 2021-10-30T23:00:05Z 2019-10-30
dc.identifier.bibliographicCitation Construction and Building Materials, (2019), v. 223, pp.: 360-367.
dc.identifier.issn 0950-0618
dc.description.abstract Nano-silica addition improves mechanical and durability behavior in mortars. However, nanomaterial handling requires use of occupational risk prevention measures as Individual Protection Equipment for the workers. Moreover, the high agglomeration of nanomaterials produces uncertainty in the expected mortar performance. Rice husk ash as a source of reactive silica in cement compositions is compared with nano-silica. The use of rice husk ash provides similar physical-chemical cementitious materials than other commercial nano-silica providing relevant differences during the composition. Near 50% wt of volatility is found for the silica nanoparticles during the handling dosage. Thus, the rice husk ash presents a reduced volatility, ~12% wt and it allows ensuring high content with adequate workability. Mortars with addition of rice husk ash reach higher compressive strength and resistivity in correlation with lower porosity. For that, the use of rice husk ash is viable as safer alternative material than nano-silica in the cementitious compositions. In addition, as the rice husk ash comes from agricultural waste resources their use as secondary raw material will contributes to circularity in the economy by reducing engineered nanomaterials consumption
dc.description.sponsorship This work was supported by the Spanish Ministry of Economy and Competitiveness through the Project MAT-2017-86450-C4-1-R, Spanish National Research Council under Project NANOMIND 201560E068 and H2020 project FISSAC grant 642154. Dr. M. Torres-Carrasco is also indebted to MINECO for a postdoctoral fellowship “Juan de la Cierva-Formación” (ref: FJCI-2016-28488).
dc.format.extent 7
dc.language.iso eng
dc.publisher Elsevier
dc.rights ©2019 Elsevier Ltd. All rights reserved.
dc.rights Atribución-NoComercial-SinDerivadas 3.0 España
dc.subject.other Cement
dc.subject.other Health
dc.subject.other Mortar
dc.subject.other Nano-silica
dc.subject.other Rice husk ash
dc.title Critical aspects in the handling of reactive silica in cementitious materials: Effectiveness of rice husk ash vs nano-silica in mortar dosage
dc.type article
dc.description.status Publicado
dc.subject.eciencia Materiales
dc.rights.accessRights openAccess
dc.relation.projectID Gobierno de España. MAT-2017-86450-C4-1-R
dc.relation.projectID info:eu-repo/grantAgreement/EC/H2020/642154/FISSAC
dc.relation.projectID Gobierno de España. FJCI-2016-28488
dc.type.version acceptedVersion
dc.identifier.publicationfirstpage 360
dc.identifier.publicationlastpage 367
dc.identifier.publicationtitle CONSTRUCTION AND BUILDING MATERIALS
dc.identifier.publicationvolume 223
dc.identifier.uxxi AR/0000024523
dc.contributor.funder Ministerio de Economía y Competitividad (España)
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