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description Publicationkeyboard_double_arrow_right Article , Conference object 2022 BelgiumPublisher:Thomas Telford Ltd. Authors: Bezuijen, Adam; Izadi, Ehsan;Bezuijen, Adam; Izadi, Ehsan;handle: 1854/LU-8585288
Impact tests of stones on a geotextile or two loosely connected geotextiles (composites) have been performed and analysed to investigate the mechanisms that lead to perforation. The geotextiles were mounted on a concrete cylinder of 0.8 m internal diameter, filled with uniformly graded dry sand. Drop tests were performed with concrete blocks of different shapes weighing approximately 40 kg. The drop heights varied between 0.25 and 5.5 m. Results show that the shape of the stone has an important influence on the critical drop height at which the geotextile is perforated. Furthermore, it appeared from image processing that the tensile strains in a woven geotextile develop in the direction of the yarns, starting from the point of impact. However, in a nonwoven geotextile, the tensile strains develop rather uniformly centred at the point of impact. An important result for composite material consisting of a woven and a nonwoven geotextile was that the lower geotextile was always the first to be damaged. This was also found in the field tests. A possible explanation is the friction between the sand and the lower geotextile, resulting in an additional tensile loading on that geotextile. This explanation is confirmed by numerical simulations.
Geosynthetics Intern... arrow_drop_down Ghent University Academic BibliographyConference object . 2018Data sources: Ghent University Academic Bibliographyadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1680/jgein.21.00036&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen bronze 2 citations 2 popularity Top 10% influence Average impulse Average Powered by BIP!more_vert Geosynthetics Intern... arrow_drop_down Ghent University Academic BibliographyConference object . 2018Data sources: Ghent University Academic Bibliographyadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1680/jgein.21.00036&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Conference object , Contribution for newspaper or weekly magazine , Article 2022 Denmark, Belgium EnglishPublisher:CLIMA 2022 conference Liao, Chenxi; Fan, Xiaojun; Bivolarova, Mariya Petrova; Mainka, Anna; Sekhar, Chandra; Laverge, Jelle; Lan, Li; Akimoto, Mizuho; Wargocki, Pawel;handle: 1854/LU-8762883
Higher ventilation rates were verified to have a positive impact on indoor air quality and therefore benefit sleep quality. However, how does ventilation influence bedroom air quality if the outdoor air quality is poor? Whilst ventilation helps to reduce indoor pollution it inadvertently brings outdoor pollution indoors, such as NO2, which is from vehicular emission. In this study, we collected the info of window and door status during sleep and measured carbon dioxide (CO2), nitrogen dioxide (NO2), volatile organic compounds (VOCs) and particulate matter (PM2.5 and PM10) among 38 bedrooms while occupants were sleeping during nights. Meanwhile, the air change rate (ACR) was calculated. The experiments were conducted in the heating season (September to December 2020) in the capital region of Denmark. The median values were 981.8 ppm (mean CO2 level during sleep), 0.6 h-1 (ACR), 3.4 µg·m−3 (NO2), 166.2 µg·m−3 (VOCs), 11.0 µg·m-3 (PM10) and 2.8 µg·m-3 (PM2.5). CO2 levels were positively correlated with VOCs levels, whereas negatively correlated with NO2 levels in bedrooms. ACR was also negatively correlated with VOCs. CO2 levels were significantly higher whereas NO2 levels were lower with both window and door closed compared to them with either window or door open. With higher ventilation rates, while occupants would be less exposed to indoor pollution of VOCs, they would be increasingly exposed to NO2. Future studies of bedroom ventilation and sleep quality should consider outdoor air quality. CLIMA 2022 conference, 2022: CLIMA 2022 The 14th REHVA HVAC World Congress
Ghent University Aca... arrow_drop_down Ghent University Academic BibliographyConference object . 2022Data sources: Ghent University Academic BibliographyOnline Research Database In TechnologyContribution for newspaper or weekly magazine . 2022Data sources: Online Research Database In Technologyadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.34641/clima.2022.128&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen 0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert Ghent University Aca... arrow_drop_down Ghent University Academic BibliographyConference object . 2022Data sources: Ghent University Academic BibliographyOnline Research Database In TechnologyContribution for newspaper or weekly magazine . 2022Data sources: Online Research Database In Technologyadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.34641/clima.2022.128&type=result"></script>'); --> </script>
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description Publicationkeyboard_double_arrow_right Article , Conference object 2022 BelgiumPublisher:Thomas Telford Ltd. Authors: Bezuijen, Adam; Izadi, Ehsan;Bezuijen, Adam; Izadi, Ehsan;handle: 1854/LU-8585288
Impact tests of stones on a geotextile or two loosely connected geotextiles (composites) have been performed and analysed to investigate the mechanisms that lead to perforation. The geotextiles were mounted on a concrete cylinder of 0.8 m internal diameter, filled with uniformly graded dry sand. Drop tests were performed with concrete blocks of different shapes weighing approximately 40 kg. The drop heights varied between 0.25 and 5.5 m. Results show that the shape of the stone has an important influence on the critical drop height at which the geotextile is perforated. Furthermore, it appeared from image processing that the tensile strains in a woven geotextile develop in the direction of the yarns, starting from the point of impact. However, in a nonwoven geotextile, the tensile strains develop rather uniformly centred at the point of impact. An important result for composite material consisting of a woven and a nonwoven geotextile was that the lower geotextile was always the first to be damaged. This was also found in the field tests. A possible explanation is the friction between the sand and the lower geotextile, resulting in an additional tensile loading on that geotextile. This explanation is confirmed by numerical simulations.
Geosynthetics Intern... arrow_drop_down Ghent University Academic BibliographyConference object . 2018Data sources: Ghent University Academic Bibliographyadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1680/jgein.21.00036&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen bronze 2 citations 2 popularity Top 10% influence Average impulse Average Powered by BIP!more_vert Geosynthetics Intern... arrow_drop_down Ghent University Academic BibliographyConference object . 2018Data sources: Ghent University Academic Bibliographyadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1680/jgein.21.00036&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Conference object , Contribution for newspaper or weekly magazine , Article 2022 Denmark, Belgium EnglishPublisher:CLIMA 2022 conference Liao, Chenxi; Fan, Xiaojun; Bivolarova, Mariya Petrova; Mainka, Anna; Sekhar, Chandra; Laverge, Jelle; Lan, Li; Akimoto, Mizuho; Wargocki, Pawel;handle: 1854/LU-8762883
Higher ventilation rates were verified to have a positive impact on indoor air quality and therefore benefit sleep quality. However, how does ventilation influence bedroom air quality if the outdoor air quality is poor? Whilst ventilation helps to reduce indoor pollution it inadvertently brings outdoor pollution indoors, such as NO2, which is from vehicular emission. In this study, we collected the info of window and door status during sleep and measured carbon dioxide (CO2), nitrogen dioxide (NO2), volatile organic compounds (VOCs) and particulate matter (PM2.5 and PM10) among 38 bedrooms while occupants were sleeping during nights. Meanwhile, the air change rate (ACR) was calculated. The experiments were conducted in the heating season (September to December 2020) in the capital region of Denmark. The median values were 981.8 ppm (mean CO2 level during sleep), 0.6 h-1 (ACR), 3.4 µg·m−3 (NO2), 166.2 µg·m−3 (VOCs), 11.0 µg·m-3 (PM10) and 2.8 µg·m-3 (PM2.5). CO2 levels were positively correlated with VOCs levels, whereas negatively correlated with NO2 levels in bedrooms. ACR was also negatively correlated with VOCs. CO2 levels were significantly higher whereas NO2 levels were lower with both window and door closed compared to them with either window or door open. With higher ventilation rates, while occupants would be less exposed to indoor pollution of VOCs, they would be increasingly exposed to NO2. Future studies of bedroom ventilation and sleep quality should consider outdoor air quality. CLIMA 2022 conference, 2022: CLIMA 2022 The 14th REHVA HVAC World Congress
Ghent University Aca... arrow_drop_down Ghent University Academic BibliographyConference object . 2022Data sources: Ghent University Academic BibliographyOnline Research Database In TechnologyContribution for newspaper or weekly magazine . 2022Data sources: Online Research Database In Technologyadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.34641/clima.2022.128&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen 0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert Ghent University Aca... arrow_drop_down Ghent University Academic BibliographyConference object . 2022Data sources: Ghent University Academic BibliographyOnline Research Database In TechnologyContribution for newspaper or weekly magazine . 2022Data sources: Online Research Database In Technologyadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.34641/clima.2022.128&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu