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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| Format: | Article |
| Language: | English |
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MDPI AG
2022-11-01
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| Series: | Gels |
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| Online Access: | https://www.mdpi.com/2310-2861/8/12/764 |
| _version_ | 1797458026529030144 |
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| author | Ali Naman Karim Pär Johansson Angela Sasic Kalagasidis |
| author_facet | Ali Naman Karim Pär Johansson Angela Sasic Kalagasidis |
| author_sort | Ali Naman Karim |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-03-09T16:32:07Z |
| format | Article |
| id | doaj.art-34af0c51c5e34f0ea0aec6d8aa001fed |
| institution | Directory Open Access Journal |
| issn | 2310-2861 |
| language | English |
| last_indexed | 2024-03-09T16:32:07Z |
| publishDate | 2022-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Gels |
| spelling | doaj.art-34af0c51c5e34f0ea0aec6d8aa001fed2023-11-24T15:00:35ZengMDPI AGGels2310-28612022-11-0181276410.3390/gels8120764Increasing Water Absorptivity of an Aerogel-Based Coating Mortar in Subsequent Wetting and DryingAli Naman Karim0Pär Johansson1Angela Sasic Kalagasidis2Department of Architecture and Civil Engineering, Chalmers University of Technology, SE-41296 Gothenburg, SwedenDepartment of Architecture and Civil Engineering, Chalmers University of Technology, SE-41296 Gothenburg, SwedenDepartment of Architecture and Civil Engineering, Chalmers University of Technology, SE-41296 Gothenburg, SwedenAerogel-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.https://www.mdpi.com/2310-2861/8/12/764aerogelcoating mortarcapillary water absorptionthermal insulationretrofittingdriving rain |
| spellingShingle | Ali Naman Karim Pär Johansson Angela Sasic Kalagasidis Increasing Water Absorptivity of an Aerogel-Based Coating Mortar in Subsequent Wetting and Drying Gels aerogel coating mortar capillary water absorption thermal insulation retrofitting driving rain |
| 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 | aerogel coating mortar capillary water absorption thermal insulation retrofitting driving rain |
| url | https://www.mdpi.com/2310-2861/8/12/764 |
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