Mechanisms of salt rejection at the ice-liquid interface during the freezing of pore fluids in the seasonal frozen soil area
Seasonal frozen soil accounts for about 53.50% of the land area in China. Frozen soil is a complex multiphase system where ice, water, soil, and air coexist. The distribution and migration of salts in frozen soil during soil freezing are notably different from those in unfrozen soil areas. However,...
Ausführliche Beschreibung
Autor*in: |
Huan Huang [verfasserIn] Chang-fu Chen [verfasserIn] Xiao-jie Mo [verfasserIn] Ding-ding Wu [verfasserIn] Yan-ming Liu [verfasserIn] Ming-zhu Liu [verfasserIn] Hong-han Chen [verfasserIn] |
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Format: |
E-Artikel |
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Sprache: |
Englisch |
Erschienen: |
2021 |
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Schlagwörter: |
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Übergeordnetes Werk: |
In: China Geology - KeAi Communications Co., Ltd., 2020, 4(2021), 3, Seite 446-454 |
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Übergeordnetes Werk: |
volume:4 ; year:2021 ; number:3 ; pages:446-454 |
Links: |
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DOI / URN: |
10.31035/cg2021059 |
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Katalog-ID: |
DOAJ080904033 |
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520 | |a Seasonal frozen soil accounts for about 53.50% of the land area in China. Frozen soil is a complex multiphase system where ice, water, soil, and air coexist. The distribution and migration of salts in frozen soil during soil freezing are notably different from those in unfrozen soil areas. However, little knowledge is available about the process and mechanisms of salt migration in frozen soil. This study explores the mechanisms of salt migration at the ice-liquid interface during the freezing of pore fluids through batch experiments. The results are as follows. The solute concentrations of liquid and solid phases at the ice-liquid interface (CL*, CS*) gradually increased at the initial stage of freezing and remained approximately constant at the middle stage. As the ice-liquid interface advanced toward the system boundary, the diffusion of the liquid phase was blocked but the ice phase continued rejecting salts. As a result, CL* and CS* rapidly increased at the final stage of freezing. The distribution characteristics of solutes in ice and the liquid phases before CL* and CS* became steady were mainly affected by the freezing temperature, initial concentrations, and particle-size distribution of media (quartz sand and kaolin). In detail, the lower the freezing temperature and the better the particle-size distribution of media, the higher the solute proportion in the ice phase at the initial stage of freezing. Meanwhile, the increase in concentration first promoted but then inhibited the increase of solutes in the ice phase. These results have insights and scientific significance for the tackling of climate change, the environmental protection of groundwater and soil, and infrastructure protection such as roads, among other things.© 2021 China Geology Editorial Office. | ||
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10.31035/cg2021059 doi (DE-627)DOAJ080904033 (DE-599)DOAJcd8dd888c32d455aa420102d90c2d27a DE-627 ger DE-627 rakwb eng TA1-2040 QE1-996.5 Huan Huang verfasserin aut Mechanisms of salt rejection at the ice-liquid interface during the freezing of pore fluids in the seasonal frozen soil area 2021 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Seasonal frozen soil accounts for about 53.50% of the land area in China. Frozen soil is a complex multiphase system where ice, water, soil, and air coexist. The distribution and migration of salts in frozen soil during soil freezing are notably different from those in unfrozen soil areas. However, little knowledge is available about the process and mechanisms of salt migration in frozen soil. This study explores the mechanisms of salt migration at the ice-liquid interface during the freezing of pore fluids through batch experiments. The results are as follows. The solute concentrations of liquid and solid phases at the ice-liquid interface (CL*, CS*) gradually increased at the initial stage of freezing and remained approximately constant at the middle stage. As the ice-liquid interface advanced toward the system boundary, the diffusion of the liquid phase was blocked but the ice phase continued rejecting salts. As a result, CL* and CS* rapidly increased at the final stage of freezing. The distribution characteristics of solutes in ice and the liquid phases before CL* and CS* became steady were mainly affected by the freezing temperature, initial concentrations, and particle-size distribution of media (quartz sand and kaolin). In detail, the lower the freezing temperature and the better the particle-size distribution of media, the higher the solute proportion in the ice phase at the initial stage of freezing. Meanwhile, the increase in concentration first promoted but then inhibited the increase of solutes in the ice phase. These results have insights and scientific significance for the tackling of climate change, the environmental protection of groundwater and soil, and infrastructure protection such as roads, among other things.© 2021 China Geology Editorial Office. Freezing area Pore fluid Ice-liquid interface Salt rejection Solute migration Building Engineering (General). Civil engineering (General) Geology Chang-fu Chen verfasserin aut Xiao-jie Mo verfasserin aut Ding-ding Wu verfasserin aut Yan-ming Liu verfasserin aut Ming-zhu Liu verfasserin aut Hong-han Chen verfasserin aut In China Geology KeAi Communications Co., Ltd., 2020 4(2021), 3, Seite 446-454 (DE-627)1662772432 (DE-600)2968211-3 25899430 nnns volume:4 year:2021 number:3 pages:446-454 https://doi.org/10.31035/cg2021059 kostenfrei https://doaj.org/article/cd8dd888c32d455aa420102d90c2d27a kostenfrei http://www.sciencedirect.com/science/article/pii/S2096519221001579 kostenfrei https://doaj.org/toc/2096-5192 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_381 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 4 2021 3 446-454 |
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10.31035/cg2021059 doi (DE-627)DOAJ080904033 (DE-599)DOAJcd8dd888c32d455aa420102d90c2d27a DE-627 ger DE-627 rakwb eng TA1-2040 QE1-996.5 Huan Huang verfasserin aut Mechanisms of salt rejection at the ice-liquid interface during the freezing of pore fluids in the seasonal frozen soil area 2021 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Seasonal frozen soil accounts for about 53.50% of the land area in China. Frozen soil is a complex multiphase system where ice, water, soil, and air coexist. The distribution and migration of salts in frozen soil during soil freezing are notably different from those in unfrozen soil areas. However, little knowledge is available about the process and mechanisms of salt migration in frozen soil. This study explores the mechanisms of salt migration at the ice-liquid interface during the freezing of pore fluids through batch experiments. The results are as follows. The solute concentrations of liquid and solid phases at the ice-liquid interface (CL*, CS*) gradually increased at the initial stage of freezing and remained approximately constant at the middle stage. As the ice-liquid interface advanced toward the system boundary, the diffusion of the liquid phase was blocked but the ice phase continued rejecting salts. As a result, CL* and CS* rapidly increased at the final stage of freezing. The distribution characteristics of solutes in ice and the liquid phases before CL* and CS* became steady were mainly affected by the freezing temperature, initial concentrations, and particle-size distribution of media (quartz sand and kaolin). In detail, the lower the freezing temperature and the better the particle-size distribution of media, the higher the solute proportion in the ice phase at the initial stage of freezing. Meanwhile, the increase in concentration first promoted but then inhibited the increase of solutes in the ice phase. These results have insights and scientific significance for the tackling of climate change, the environmental protection of groundwater and soil, and infrastructure protection such as roads, among other things.© 2021 China Geology Editorial Office. Freezing area Pore fluid Ice-liquid interface Salt rejection Solute migration Building Engineering (General). Civil engineering (General) Geology Chang-fu Chen verfasserin aut Xiao-jie Mo verfasserin aut Ding-ding Wu verfasserin aut Yan-ming Liu verfasserin aut Ming-zhu Liu verfasserin aut Hong-han Chen verfasserin aut In China Geology KeAi Communications Co., Ltd., 2020 4(2021), 3, Seite 446-454 (DE-627)1662772432 (DE-600)2968211-3 25899430 nnns volume:4 year:2021 number:3 pages:446-454 https://doi.org/10.31035/cg2021059 kostenfrei https://doaj.org/article/cd8dd888c32d455aa420102d90c2d27a kostenfrei http://www.sciencedirect.com/science/article/pii/S2096519221001579 kostenfrei https://doaj.org/toc/2096-5192 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_381 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 4 2021 3 446-454 |
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10.31035/cg2021059 doi (DE-627)DOAJ080904033 (DE-599)DOAJcd8dd888c32d455aa420102d90c2d27a DE-627 ger DE-627 rakwb eng TA1-2040 QE1-996.5 Huan Huang verfasserin aut Mechanisms of salt rejection at the ice-liquid interface during the freezing of pore fluids in the seasonal frozen soil area 2021 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Seasonal frozen soil accounts for about 53.50% of the land area in China. Frozen soil is a complex multiphase system where ice, water, soil, and air coexist. The distribution and migration of salts in frozen soil during soil freezing are notably different from those in unfrozen soil areas. However, little knowledge is available about the process and mechanisms of salt migration in frozen soil. This study explores the mechanisms of salt migration at the ice-liquid interface during the freezing of pore fluids through batch experiments. The results are as follows. The solute concentrations of liquid and solid phases at the ice-liquid interface (CL*, CS*) gradually increased at the initial stage of freezing and remained approximately constant at the middle stage. As the ice-liquid interface advanced toward the system boundary, the diffusion of the liquid phase was blocked but the ice phase continued rejecting salts. As a result, CL* and CS* rapidly increased at the final stage of freezing. The distribution characteristics of solutes in ice and the liquid phases before CL* and CS* became steady were mainly affected by the freezing temperature, initial concentrations, and particle-size distribution of media (quartz sand and kaolin). In detail, the lower the freezing temperature and the better the particle-size distribution of media, the higher the solute proportion in the ice phase at the initial stage of freezing. Meanwhile, the increase in concentration first promoted but then inhibited the increase of solutes in the ice phase. These results have insights and scientific significance for the tackling of climate change, the environmental protection of groundwater and soil, and infrastructure protection such as roads, among other things.© 2021 China Geology Editorial Office. Freezing area Pore fluid Ice-liquid interface Salt rejection Solute migration Building Engineering (General). Civil engineering (General) Geology Chang-fu Chen verfasserin aut Xiao-jie Mo verfasserin aut Ding-ding Wu verfasserin aut Yan-ming Liu verfasserin aut Ming-zhu Liu verfasserin aut Hong-han Chen verfasserin aut In China Geology KeAi Communications Co., Ltd., 2020 4(2021), 3, Seite 446-454 (DE-627)1662772432 (DE-600)2968211-3 25899430 nnns volume:4 year:2021 number:3 pages:446-454 https://doi.org/10.31035/cg2021059 kostenfrei https://doaj.org/article/cd8dd888c32d455aa420102d90c2d27a kostenfrei http://www.sciencedirect.com/science/article/pii/S2096519221001579 kostenfrei https://doaj.org/toc/2096-5192 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_381 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 4 2021 3 446-454 |
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10.31035/cg2021059 doi (DE-627)DOAJ080904033 (DE-599)DOAJcd8dd888c32d455aa420102d90c2d27a DE-627 ger DE-627 rakwb eng TA1-2040 QE1-996.5 Huan Huang verfasserin aut Mechanisms of salt rejection at the ice-liquid interface during the freezing of pore fluids in the seasonal frozen soil area 2021 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Seasonal frozen soil accounts for about 53.50% of the land area in China. Frozen soil is a complex multiphase system where ice, water, soil, and air coexist. The distribution and migration of salts in frozen soil during soil freezing are notably different from those in unfrozen soil areas. However, little knowledge is available about the process and mechanisms of salt migration in frozen soil. This study explores the mechanisms of salt migration at the ice-liquid interface during the freezing of pore fluids through batch experiments. The results are as follows. The solute concentrations of liquid and solid phases at the ice-liquid interface (CL*, CS*) gradually increased at the initial stage of freezing and remained approximately constant at the middle stage. As the ice-liquid interface advanced toward the system boundary, the diffusion of the liquid phase was blocked but the ice phase continued rejecting salts. As a result, CL* and CS* rapidly increased at the final stage of freezing. The distribution characteristics of solutes in ice and the liquid phases before CL* and CS* became steady were mainly affected by the freezing temperature, initial concentrations, and particle-size distribution of media (quartz sand and kaolin). In detail, the lower the freezing temperature and the better the particle-size distribution of media, the higher the solute proportion in the ice phase at the initial stage of freezing. Meanwhile, the increase in concentration first promoted but then inhibited the increase of solutes in the ice phase. These results have insights and scientific significance for the tackling of climate change, the environmental protection of groundwater and soil, and infrastructure protection such as roads, among other things.© 2021 China Geology Editorial Office. Freezing area Pore fluid Ice-liquid interface Salt rejection Solute migration Building Engineering (General). Civil engineering (General) Geology Chang-fu Chen verfasserin aut Xiao-jie Mo verfasserin aut Ding-ding Wu verfasserin aut Yan-ming Liu verfasserin aut Ming-zhu Liu verfasserin aut Hong-han Chen verfasserin aut In China Geology KeAi Communications Co., Ltd., 2020 4(2021), 3, Seite 446-454 (DE-627)1662772432 (DE-600)2968211-3 25899430 nnns volume:4 year:2021 number:3 pages:446-454 https://doi.org/10.31035/cg2021059 kostenfrei https://doaj.org/article/cd8dd888c32d455aa420102d90c2d27a kostenfrei http://www.sciencedirect.com/science/article/pii/S2096519221001579 kostenfrei https://doaj.org/toc/2096-5192 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_381 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 4 2021 3 446-454 |
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TA1-2040 QE1-996.5 Mechanisms of salt rejection at the ice-liquid interface during the freezing of pore fluids in the seasonal frozen soil area Freezing area Pore fluid Ice-liquid interface Salt rejection Solute migration Building |
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Mechanisms of salt rejection at the ice-liquid interface during the freezing of pore fluids in the seasonal frozen soil area |
abstract |
Seasonal frozen soil accounts for about 53.50% of the land area in China. Frozen soil is a complex multiphase system where ice, water, soil, and air coexist. The distribution and migration of salts in frozen soil during soil freezing are notably different from those in unfrozen soil areas. However, little knowledge is available about the process and mechanisms of salt migration in frozen soil. This study explores the mechanisms of salt migration at the ice-liquid interface during the freezing of pore fluids through batch experiments. The results are as follows. The solute concentrations of liquid and solid phases at the ice-liquid interface (CL*, CS*) gradually increased at the initial stage of freezing and remained approximately constant at the middle stage. As the ice-liquid interface advanced toward the system boundary, the diffusion of the liquid phase was blocked but the ice phase continued rejecting salts. As a result, CL* and CS* rapidly increased at the final stage of freezing. The distribution characteristics of solutes in ice and the liquid phases before CL* and CS* became steady were mainly affected by the freezing temperature, initial concentrations, and particle-size distribution of media (quartz sand and kaolin). In detail, the lower the freezing temperature and the better the particle-size distribution of media, the higher the solute proportion in the ice phase at the initial stage of freezing. Meanwhile, the increase in concentration first promoted but then inhibited the increase of solutes in the ice phase. These results have insights and scientific significance for the tackling of climate change, the environmental protection of groundwater and soil, and infrastructure protection such as roads, among other things.© 2021 China Geology Editorial Office. |
abstractGer |
Seasonal frozen soil accounts for about 53.50% of the land area in China. Frozen soil is a complex multiphase system where ice, water, soil, and air coexist. The distribution and migration of salts in frozen soil during soil freezing are notably different from those in unfrozen soil areas. However, little knowledge is available about the process and mechanisms of salt migration in frozen soil. This study explores the mechanisms of salt migration at the ice-liquid interface during the freezing of pore fluids through batch experiments. The results are as follows. The solute concentrations of liquid and solid phases at the ice-liquid interface (CL*, CS*) gradually increased at the initial stage of freezing and remained approximately constant at the middle stage. As the ice-liquid interface advanced toward the system boundary, the diffusion of the liquid phase was blocked but the ice phase continued rejecting salts. As a result, CL* and CS* rapidly increased at the final stage of freezing. The distribution characteristics of solutes in ice and the liquid phases before CL* and CS* became steady were mainly affected by the freezing temperature, initial concentrations, and particle-size distribution of media (quartz sand and kaolin). In detail, the lower the freezing temperature and the better the particle-size distribution of media, the higher the solute proportion in the ice phase at the initial stage of freezing. Meanwhile, the increase in concentration first promoted but then inhibited the increase of solutes in the ice phase. These results have insights and scientific significance for the tackling of climate change, the environmental protection of groundwater and soil, and infrastructure protection such as roads, among other things.© 2021 China Geology Editorial Office. |
abstract_unstemmed |
Seasonal frozen soil accounts for about 53.50% of the land area in China. Frozen soil is a complex multiphase system where ice, water, soil, and air coexist. The distribution and migration of salts in frozen soil during soil freezing are notably different from those in unfrozen soil areas. However, little knowledge is available about the process and mechanisms of salt migration in frozen soil. This study explores the mechanisms of salt migration at the ice-liquid interface during the freezing of pore fluids through batch experiments. The results are as follows. The solute concentrations of liquid and solid phases at the ice-liquid interface (CL*, CS*) gradually increased at the initial stage of freezing and remained approximately constant at the middle stage. As the ice-liquid interface advanced toward the system boundary, the diffusion of the liquid phase was blocked but the ice phase continued rejecting salts. As a result, CL* and CS* rapidly increased at the final stage of freezing. The distribution characteristics of solutes in ice and the liquid phases before CL* and CS* became steady were mainly affected by the freezing temperature, initial concentrations, and particle-size distribution of media (quartz sand and kaolin). In detail, the lower the freezing temperature and the better the particle-size distribution of media, the higher the solute proportion in the ice phase at the initial stage of freezing. Meanwhile, the increase in concentration first promoted but then inhibited the increase of solutes in the ice phase. These results have insights and scientific significance for the tackling of climate change, the environmental protection of groundwater and soil, and infrastructure protection such as roads, among other things.© 2021 China Geology Editorial Office. |
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Mechanisms of salt rejection at the ice-liquid interface during the freezing of pore fluids in the seasonal frozen soil area |
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Frozen soil is a complex multiphase system where ice, water, soil, and air coexist. The distribution and migration of salts in frozen soil during soil freezing are notably different from those in unfrozen soil areas. However, little knowledge is available about the process and mechanisms of salt migration in frozen soil. This study explores the mechanisms of salt migration at the ice-liquid interface during the freezing of pore fluids through batch experiments. The results are as follows. The solute concentrations of liquid and solid phases at the ice-liquid interface (CL*, CS*) gradually increased at the initial stage of freezing and remained approximately constant at the middle stage. As the ice-liquid interface advanced toward the system boundary, the diffusion of the liquid phase was blocked but the ice phase continued rejecting salts. As a result, CL* and CS* rapidly increased at the final stage of freezing. The distribution characteristics of solutes in ice and the liquid phases before CL* and CS* became steady were mainly affected by the freezing temperature, initial concentrations, and particle-size distribution of media (quartz sand and kaolin). In detail, the lower the freezing temperature and the better the particle-size distribution of media, the higher the solute proportion in the ice phase at the initial stage of freezing. Meanwhile, the increase in concentration first promoted but then inhibited the increase of solutes in the ice phase. These results have insights and scientific significance for the tackling of climate change, the environmental protection of groundwater and soil, and infrastructure protection such as roads, among other things.© 2021 China Geology Editorial Office.</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Freezing area</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Pore fluid</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Ice-liquid interface</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Salt rejection</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Solute migration</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Building</subfield></datafield><datafield tag="653" ind1=" " ind2="0"><subfield code="a">Engineering (General). 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