Hydrothermal accumulation under asphalt pavement in cold regions
Abstract Water and heat changes are the main problems that plague the stability and service performance of roadbeds in cold regions. Though hydrothermal transfer and accumulation directly affect roadbed properties, these processes remain poorly understood as monitoring data are often collected over...
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ftdoajarticles:oai:doaj.org/article:aa7dd265be294f85a30ebc2a1f5e5ea7 2023-05-15T17:58:09+02:00 Hydrothermal accumulation under asphalt pavement in cold regions Zhongqiong Zhang Qingbai Wu Ze Zhang Lihui Luo 2019-10-01T00:00:00Z https://doi.org/10.1002/ese3.401 https://doaj.org/article/aa7dd265be294f85a30ebc2a1f5e5ea7 EN eng Wiley https://doi.org/10.1002/ese3.401 https://doaj.org/toc/2050-0505 2050-0505 doi:10.1002/ese3.401 https://doaj.org/article/aa7dd265be294f85a30ebc2a1f5e5ea7 Energy Science & Engineering, Vol 7, Iss 5, Pp 1925-1936 (2019) asphalt pavement hydrothermal accumulation liquid–vapor water transport thawing and freezing process Technology T Science Q article 2019 ftdoajarticles https://doi.org/10.1002/ese3.401 2022-12-31T02:11:30Z Abstract Water and heat changes are the main problems that plague the stability and service performance of roadbeds in cold regions. Though hydrothermal transfer and accumulation directly affect roadbed properties, these processes remain poorly understood as monitoring data are often collected over short time periods and large spacing in depth. This research compares water and temperature data collected from 2012 to 2015 to elucidate the physical mechanisms of hydrothermal accumulation under both asphalt pavement and original pavement. These thermal and physical mechanisms include differences in the freezing process (FP) and the thawing process (TP), water transport, condensation, and hydrothermal accumulation. For instance, when compared to the underlying layer, the thawing of the surface layer of asphalt pavement was delayed by 35 days because of differences in hydrothermal properties. During TP, liquid water content changes from 3.31%‐13.2% to 15%‐37.67%, and the unfrozen water content of the soil layers under the asphalt pavement was approximately 6.85%‐12.34% higher than that of the soil layers under the original pavement. A layer with high water content and heat formed under the surface layer of asphalt pavement and provided the appropriate conditions for vapor transport and condensation. Soil layers thawed early in the preceding year, and this hydrothermal accumulation occurred on an annual basis. The annual minimum monthly average temperature was thus found to be increasing at the rate of 0.34°C/y. As water content also accounts for heat accumulation and was found to be more sensitive to change than temperature, the results of this study can provide theoretical and technical data useful for highway construction and design in permafrost regions. Article in Journal/Newspaper permafrost Directory of Open Access Journals: DOAJ Articles Energy Science & Engineering 7 5 1925 1936 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
asphalt pavement hydrothermal accumulation liquid–vapor water transport thawing and freezing process Technology T Science Q |
spellingShingle |
asphalt pavement hydrothermal accumulation liquid–vapor water transport thawing and freezing process Technology T Science Q Zhongqiong Zhang Qingbai Wu Ze Zhang Lihui Luo Hydrothermal accumulation under asphalt pavement in cold regions |
topic_facet |
asphalt pavement hydrothermal accumulation liquid–vapor water transport thawing and freezing process Technology T Science Q |
description |
Abstract Water and heat changes are the main problems that plague the stability and service performance of roadbeds in cold regions. Though hydrothermal transfer and accumulation directly affect roadbed properties, these processes remain poorly understood as monitoring data are often collected over short time periods and large spacing in depth. This research compares water and temperature data collected from 2012 to 2015 to elucidate the physical mechanisms of hydrothermal accumulation under both asphalt pavement and original pavement. These thermal and physical mechanisms include differences in the freezing process (FP) and the thawing process (TP), water transport, condensation, and hydrothermal accumulation. For instance, when compared to the underlying layer, the thawing of the surface layer of asphalt pavement was delayed by 35 days because of differences in hydrothermal properties. During TP, liquid water content changes from 3.31%‐13.2% to 15%‐37.67%, and the unfrozen water content of the soil layers under the asphalt pavement was approximately 6.85%‐12.34% higher than that of the soil layers under the original pavement. A layer with high water content and heat formed under the surface layer of asphalt pavement and provided the appropriate conditions for vapor transport and condensation. Soil layers thawed early in the preceding year, and this hydrothermal accumulation occurred on an annual basis. The annual minimum monthly average temperature was thus found to be increasing at the rate of 0.34°C/y. As water content also accounts for heat accumulation and was found to be more sensitive to change than temperature, the results of this study can provide theoretical and technical data useful for highway construction and design in permafrost regions. |
format |
Article in Journal/Newspaper |
author |
Zhongqiong Zhang Qingbai Wu Ze Zhang Lihui Luo |
author_facet |
Zhongqiong Zhang Qingbai Wu Ze Zhang Lihui Luo |
author_sort |
Zhongqiong Zhang |
title |
Hydrothermal accumulation under asphalt pavement in cold regions |
title_short |
Hydrothermal accumulation under asphalt pavement in cold regions |
title_full |
Hydrothermal accumulation under asphalt pavement in cold regions |
title_fullStr |
Hydrothermal accumulation under asphalt pavement in cold regions |
title_full_unstemmed |
Hydrothermal accumulation under asphalt pavement in cold regions |
title_sort |
hydrothermal accumulation under asphalt pavement in cold regions |
publisher |
Wiley |
publishDate |
2019 |
url |
https://doi.org/10.1002/ese3.401 https://doaj.org/article/aa7dd265be294f85a30ebc2a1f5e5ea7 |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
Energy Science & Engineering, Vol 7, Iss 5, Pp 1925-1936 (2019) |
op_relation |
https://doi.org/10.1002/ese3.401 https://doaj.org/toc/2050-0505 2050-0505 doi:10.1002/ese3.401 https://doaj.org/article/aa7dd265be294f85a30ebc2a1f5e5ea7 |
op_doi |
https://doi.org/10.1002/ese3.401 |
container_title |
Energy Science & Engineering |
container_volume |
7 |
container_issue |
5 |
container_start_page |
1925 |
op_container_end_page |
1936 |
_version_ |
1766166690095169536 |