Experimental and Numerical Research on Utilizing Modified Silty Clay and Extruded Polystyrene (XPS) Board as the Subgrade Thermal Insulation Layer in a Seasonally Frozen Region, Northeast China

For strengthening sustainability of subgrade life-cycle service performance and storing industry solid wastes in seasonally frozen regions, compared to previous research of modified silty clay (MC) which consisted of oil shale ash (OSA), fly ash (FA), and silty clay (SC), we identified for the first...

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Main Authors: Qinglin Li, Haibin Wei, Peilei Zhou, Yangpeng Zhang, Leilei Han, Shuanye Han
Format: Article
Language:English
Published: MDPI AG 2019-06-01
Series:Sustainability
Subjects:
Online Access:https://www.mdpi.com/2071-1050/11/13/3495
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spelling doaj-1a15db08373e4e76a61c00d022d7f4962020-11-25T02:45:32ZengMDPI AGSustainability2071-10502019-06-011113349510.3390/su11133495su11133495Experimental and Numerical Research on Utilizing Modified Silty Clay and Extruded Polystyrene (XPS) Board as the Subgrade Thermal Insulation Layer in a Seasonally Frozen Region, Northeast ChinaQinglin Li0Haibin Wei1Peilei Zhou2Yangpeng Zhang3Leilei Han4Shuanye Han5School of Transportation, Jilin University, Changchun 130022, ChinaSchool of Transportation, Jilin University, Changchun 130022, ChinaSchool of Transportation, Jilin University, Changchun 130022, ChinaSchool of Transportation, Jilin University, Changchun 130022, ChinaSchool of Transportation, Jilin University, Changchun 130022, ChinaSchool of Transportation, Jilin University, Changchun 130022, ChinaFor strengthening sustainability of subgrade life-cycle service performance and storing industry solid wastes in seasonally frozen regions, compared to previous research of modified silty clay (MC) which consisted of oil shale ash (OSA), fly ash (FA), and silty clay (SC), we identified for the first time, the variations in the thermal insulation capability of MC with different levels of dry density and moisture content. Taking into consideration the effects of 0−20 freeze-thaw (F-T) cycles by a laboratory test, and by the numerical simulation of coupling moisture-temperature, while considering the effects of F-T cycles, the thermal insulation capability of the MC board and the XPS board were studied quantitatively. The testing results show that the thermal conductivity of MC and SC gradually decreases as the number of F-T cycles increases, and that of the XPS board increases with the increased number of F-T cycles, and tend to be of a constant value of 0.061 W/m/K after 17 F-T cycles. The specific heat capacity of the solid particles of the MC, SC, and XPS board does not change regularly as their moisture content, and the number of F-T cycles change, and their variations are in the range of the test error (2%). Simulation results show that MC has the advantage of the thermal insulation property to reduce the frost-depth of 0.21 m, and the thermal insulation property of the composite layer consisting of the MC and XPS board is greater to reduce the frost-depth of 0.55 m, so that it can protect both the SC and sand gravel of the experimental road from the frost heave damage. The research methods and results are very significant in accurately evaluating the thermal insulation capacity and the sustainability of MC and the composite layer consisting of the MC and XPS board, strengthening the stability of the subgrade and increasing the availability of industrial waste.https://www.mdpi.com/2071-1050/11/13/3495modified silty clayoil shale ashfly ashXPS boardthermal conductivityspecific heat capacityfreeze-thaw cyclesthermal insulation capacity
collection DOAJ
language English
format Article
sources DOAJ
author Qinglin Li
Haibin Wei
Peilei Zhou
Yangpeng Zhang
Leilei Han
Shuanye Han
spellingShingle Qinglin Li
Haibin Wei
Peilei Zhou
Yangpeng Zhang
Leilei Han
Shuanye Han
Experimental and Numerical Research on Utilizing Modified Silty Clay and Extruded Polystyrene (XPS) Board as the Subgrade Thermal Insulation Layer in a Seasonally Frozen Region, Northeast China
Sustainability
modified silty clay
oil shale ash
fly ash
XPS board
thermal conductivity
specific heat capacity
freeze-thaw cycles
thermal insulation capacity
author_facet Qinglin Li
Haibin Wei
Peilei Zhou
Yangpeng Zhang
Leilei Han
Shuanye Han
author_sort Qinglin Li
title Experimental and Numerical Research on Utilizing Modified Silty Clay and Extruded Polystyrene (XPS) Board as the Subgrade Thermal Insulation Layer in a Seasonally Frozen Region, Northeast China
title_short Experimental and Numerical Research on Utilizing Modified Silty Clay and Extruded Polystyrene (XPS) Board as the Subgrade Thermal Insulation Layer in a Seasonally Frozen Region, Northeast China
title_full Experimental and Numerical Research on Utilizing Modified Silty Clay and Extruded Polystyrene (XPS) Board as the Subgrade Thermal Insulation Layer in a Seasonally Frozen Region, Northeast China
title_fullStr Experimental and Numerical Research on Utilizing Modified Silty Clay and Extruded Polystyrene (XPS) Board as the Subgrade Thermal Insulation Layer in a Seasonally Frozen Region, Northeast China
title_full_unstemmed Experimental and Numerical Research on Utilizing Modified Silty Clay and Extruded Polystyrene (XPS) Board as the Subgrade Thermal Insulation Layer in a Seasonally Frozen Region, Northeast China
title_sort experimental and numerical research on utilizing modified silty clay and extruded polystyrene (xps) board as the subgrade thermal insulation layer in a seasonally frozen region, northeast china
publisher MDPI AG
series Sustainability
issn 2071-1050
publishDate 2019-06-01
description For strengthening sustainability of subgrade life-cycle service performance and storing industry solid wastes in seasonally frozen regions, compared to previous research of modified silty clay (MC) which consisted of oil shale ash (OSA), fly ash (FA), and silty clay (SC), we identified for the first time, the variations in the thermal insulation capability of MC with different levels of dry density and moisture content. Taking into consideration the effects of 0−20 freeze-thaw (F-T) cycles by a laboratory test, and by the numerical simulation of coupling moisture-temperature, while considering the effects of F-T cycles, the thermal insulation capability of the MC board and the XPS board were studied quantitatively. The testing results show that the thermal conductivity of MC and SC gradually decreases as the number of F-T cycles increases, and that of the XPS board increases with the increased number of F-T cycles, and tend to be of a constant value of 0.061 W/m/K after 17 F-T cycles. The specific heat capacity of the solid particles of the MC, SC, and XPS board does not change regularly as their moisture content, and the number of F-T cycles change, and their variations are in the range of the test error (2%). Simulation results show that MC has the advantage of the thermal insulation property to reduce the frost-depth of 0.21 m, and the thermal insulation property of the composite layer consisting of the MC and XPS board is greater to reduce the frost-depth of 0.55 m, so that it can protect both the SC and sand gravel of the experimental road from the frost heave damage. The research methods and results are very significant in accurately evaluating the thermal insulation capacity and the sustainability of MC and the composite layer consisting of the MC and XPS board, strengthening the stability of the subgrade and increasing the availability of industrial waste.
topic modified silty clay
oil shale ash
fly ash
XPS board
thermal conductivity
specific heat capacity
freeze-thaw cycles
thermal insulation capacity
url https://www.mdpi.com/2071-1050/11/13/3495
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