Drying-rewetting cycles in ordinary Portland cement mortars investigated by electrical impedance spectroscopy

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Title: Drying-rewetting cycles in ordinary Portland cement mortars investigated by electrical impedance spectroscopy
Authors: Fita, Inmaculada Concepción | Cruz, José María | Calvo, Clara | Soriano, Lourdes | Payá, Jordi | Sánchez, Isidro
Research Group/s: Durabilidad de Materiales y Construcciones en Ingeniería y Arquitectura
Center, Department or Service: Universidad de Alicante. Departamento de Ingeniería Civil
Keywords: Mortar | Gel-porosity | Capillary-porosity | Drying-rewetting | Electrical-impedance-spectroscopy
Knowledge Area: Ingeniería de la Construcción
Issue Date: 30-Oct-2018
Publisher: Elsevier
Citation: Construction and Building Materials. 2018, 187: 954-963. doi:10.1016/j.conbuildmat.2018.07.227
Abstract: Changes caused in the porous microstructure of ordinary Portland cement (OPC) mortars were studied using electrical impedance spectroscopy (EIS) and equivalent circuit (EqC). Two successive processes, at 20 °C and 50 °C, consisting of several drying-rewetting cycles, were applied to the mortars. After each cycle, the electrical impedance and the amount of water absorbed were measured. The EIS-EqC methodology allowed to find two distributed impedance relaxations, associated to capillary and gel-C-S-H porosities, respectively. At room temperature any microstructural change was not detected. Nevertheless, at 50 °C two microstructural changes were inferred: 1) the volume of accessible porosity increased (pore coarsening) and 2) the surface of the conductive path through C-S-H gel became more conductive (surface smoothing).
Sponsor: The authors would like to thank the Spanish Ministry of Science and Innovation for supporting this research through the project BIA 2011-26947.
URI: http://hdl.handle.net/10045/80792
ISSN: 0950-0618 (Print) | 1879-0526 (Online)
DOI: 10.1016/j.conbuildmat.2018.07.227
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2018 Elsevier Ltd.
Peer Review: si
Publisher version: https://doi.org/10.1016/j.conbuildmat.2018.07.227
Appears in Collections:INV - DMCIA - Artículos de Revistas

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