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Increasing Water Absorptivity of an Aerogel-Based Coating Mortar in Subsequent Wetting and Drying

Aerogel-based coating mortars are energy-efficient composites with thermal conductivities of 30–50 mW/(m·K). They are useful when retrofitting uninsulated building envelopes, particularly in listed masonry buildings, as shown in studies. Meanwhile, the long-term reliability of their hygrothermal pro...

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Autores principales: Karim, Ali Naman, Johansson, Pär, Sasic Kalagasidis, Angela
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9777926/
https://www.ncbi.nlm.nih.gov/pubmed/36547288
http://dx.doi.org/10.3390/gels8120764
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author Karim, Ali Naman
Johansson, Pär
Sasic Kalagasidis, Angela
author_facet Karim, Ali Naman
Johansson, Pär
Sasic Kalagasidis, Angela
author_sort Karim, Ali Naman
collection PubMed
description Aerogel-based coating mortars are energy-efficient composites with thermal conductivities of 30–50 mW/(m·K). They are useful when retrofitting uninsulated building envelopes, particularly in listed masonry buildings, as shown in studies. Meanwhile, the long-term reliability of their hygrothermal properties, typically declared after a single laboratory measurement, is not confirmed. To illustrate the latter and by combining experimental and numerical methods, this study shows that (1) the capillary water absorptivity of a commercially available aerogel-based coating mortar increases after repeated drying and wetting cycles, and (2) leads to a higher moisture content in a masonry wall. After the third cycle, the measured water absorption was more than five times higher than after the first one. Based on numerical simulations, the increasing capillary water absorptivity results in 36% higher relative humidity in the wall if the aerogel-based coating mortar is applied externally and exposed to driving rain. Future research should investigate the reasons behind the observed deviations in the capillary water absorptivity and whether it applies to other types of aerogel-based coating mortars.
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spelling pubmed-97779262022-12-23 Increasing Water Absorptivity of an Aerogel-Based Coating Mortar in Subsequent Wetting and Drying Karim, Ali Naman Johansson, Pär Sasic Kalagasidis, Angela Gels Article Aerogel-based coating mortars are energy-efficient composites with thermal conductivities of 30–50 mW/(m·K). They are useful when retrofitting uninsulated building envelopes, particularly in listed masonry buildings, as shown in studies. Meanwhile, the long-term reliability of their hygrothermal properties, typically declared after a single laboratory measurement, is not confirmed. To illustrate the latter and by combining experimental and numerical methods, this study shows that (1) the capillary water absorptivity of a commercially available aerogel-based coating mortar increases after repeated drying and wetting cycles, and (2) leads to a higher moisture content in a masonry wall. After the third cycle, the measured water absorption was more than five times higher than after the first one. Based on numerical simulations, the increasing capillary water absorptivity results in 36% higher relative humidity in the wall if the aerogel-based coating mortar is applied externally and exposed to driving rain. Future research should investigate the reasons behind the observed deviations in the capillary water absorptivity and whether it applies to other types of aerogel-based coating mortars. MDPI 2022-11-24 /pmc/articles/PMC9777926/ /pubmed/36547288 http://dx.doi.org/10.3390/gels8120764 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/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 (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Karim, Ali Naman
Johansson, Pär
Sasic Kalagasidis, Angela
Increasing Water Absorptivity of an Aerogel-Based Coating Mortar in Subsequent Wetting and Drying
title Increasing Water Absorptivity of an Aerogel-Based Coating Mortar in Subsequent Wetting and Drying
title_full Increasing Water Absorptivity of an Aerogel-Based Coating Mortar in Subsequent Wetting and Drying
title_fullStr Increasing Water Absorptivity of an Aerogel-Based Coating Mortar in Subsequent Wetting and Drying
title_full_unstemmed Increasing Water Absorptivity of an Aerogel-Based Coating Mortar in Subsequent Wetting and Drying
title_short Increasing Water Absorptivity of an Aerogel-Based Coating Mortar in Subsequent Wetting and Drying
title_sort increasing water absorptivity of an aerogel-based coating mortar in subsequent wetting and drying
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9777926/
https://www.ncbi.nlm.nih.gov/pubmed/36547288
http://dx.doi.org/10.3390/gels8120764
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