Drying-rewetting cycles in ordinary Portland cement mortars investigated by electrical impedance spectroscopy
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Título: | Drying-rewetting cycles in ordinary Portland cement mortars investigated by electrical impedance spectroscopy |
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Autor/es: | Fita, Inmaculada Concepción | Cruz, José María | Calvo, Clara | Soriano, Lourdes | Payá, Jordi | Sánchez, Isidro |
Grupo/s de investigación o GITE: | Durabilidad de Materiales y Construcciones en Ingeniería y Arquitectura |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Ingeniería Civil |
Palabras clave: | Mortar | Gel-porosity | Capillary-porosity | Drying-rewetting | Electrical-impedance-spectroscopy |
Área/s de conocimiento: | Ingeniería de la Construcción |
Fecha de publicación: | 30-oct-2018 |
Editor: | Elsevier |
Cita bibliográfica: | Construction and Building Materials. 2018, 187: 954-963. doi:10.1016/j.conbuildmat.2018.07.227 |
Resumen: | 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). |
Patrocinador/es: | 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 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2018 Elsevier Ltd. |
Revisión científica: | si |
Versión del editor: | https://doi.org/10.1016/j.conbuildmat.2018.07.227 |
Aparece en las colecciones: | INV - DMCIA - Artículos de Revistas |
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2018_Fita_etal_ConsBuilMat_final.pdf | Versión final (acceso restringido) | 1,35 MB | Adobe PDF | Abrir Solicitar una copia |
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