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Experimental Examination of Electrical Characteristics for Portland Cement Mortar Frost Damage Evaluation

Electrical measurements are promising for evaluation of frost damage of concrete, but the index is still controversial. In this paper, to propose an efficient index, various electrical characteristics were examined to correlate them with the mechanical property degradation of meso-scale mortar sampl...

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Detalles Bibliográficos
Autores principales: Wang, Yi, Ueda, Tamon, Gong, Fuyuan, Zhang, Dawei, Wang, Zhao
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7085024/
https://www.ncbi.nlm.nih.gov/pubmed/32164303
http://dx.doi.org/10.3390/ma13051258
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author Wang, Yi
Ueda, Tamon
Gong, Fuyuan
Zhang, Dawei
Wang, Zhao
author_facet Wang, Yi
Ueda, Tamon
Gong, Fuyuan
Zhang, Dawei
Wang, Zhao
author_sort Wang, Yi
collection PubMed
description Electrical measurements are promising for evaluation of frost damage of concrete, but the index is still controversial. In this paper, to propose an efficient index, various electrical characteristics were examined to correlate them with the mechanical property degradation of meso-scale mortar samples due to combined effects of sodium chloride and freeze–thaw cycles (FTCs). While the electrical responses of specimens were measured during FTCs, the mechanical properties were obtained from three-point bending tests after FTCs. Typical microstructural change after the damage was also analyzed by using a water absorption test. The results showed that no clear degradation tendency was observed for electrical resistivity at the lowest temperature, the activation energy or the freezing/thawing point change with the FTCs. The reduction in electrical resistivity at reference temperature has a consistent tendency with that of elastic modulus and flexural strength, thus can be an efficient index for quantitative frost damage evaluation. The change due to salt-frost damage is mainly due to the increase of connectivity rather than porosity.
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spelling pubmed-70850242020-03-23 Experimental Examination of Electrical Characteristics for Portland Cement Mortar Frost Damage Evaluation Wang, Yi Ueda, Tamon Gong, Fuyuan Zhang, Dawei Wang, Zhao Materials (Basel) Article Electrical measurements are promising for evaluation of frost damage of concrete, but the index is still controversial. In this paper, to propose an efficient index, various electrical characteristics were examined to correlate them with the mechanical property degradation of meso-scale mortar samples due to combined effects of sodium chloride and freeze–thaw cycles (FTCs). While the electrical responses of specimens were measured during FTCs, the mechanical properties were obtained from three-point bending tests after FTCs. Typical microstructural change after the damage was also analyzed by using a water absorption test. The results showed that no clear degradation tendency was observed for electrical resistivity at the lowest temperature, the activation energy or the freezing/thawing point change with the FTCs. The reduction in electrical resistivity at reference temperature has a consistent tendency with that of elastic modulus and flexural strength, thus can be an efficient index for quantitative frost damage evaluation. The change due to salt-frost damage is mainly due to the increase of connectivity rather than porosity. MDPI 2020-03-10 /pmc/articles/PMC7085024/ /pubmed/32164303 http://dx.doi.org/10.3390/ma13051258 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Wang, Yi
Ueda, Tamon
Gong, Fuyuan
Zhang, Dawei
Wang, Zhao
Experimental Examination of Electrical Characteristics for Portland Cement Mortar Frost Damage Evaluation
title Experimental Examination of Electrical Characteristics for Portland Cement Mortar Frost Damage Evaluation
title_full Experimental Examination of Electrical Characteristics for Portland Cement Mortar Frost Damage Evaluation
title_fullStr Experimental Examination of Electrical Characteristics for Portland Cement Mortar Frost Damage Evaluation
title_full_unstemmed Experimental Examination of Electrical Characteristics for Portland Cement Mortar Frost Damage Evaluation
title_short Experimental Examination of Electrical Characteristics for Portland Cement Mortar Frost Damage Evaluation
title_sort experimental examination of electrical characteristics for portland cement mortar frost damage evaluation
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7085024/
https://www.ncbi.nlm.nih.gov/pubmed/32164303
http://dx.doi.org/10.3390/ma13051258
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