Deterioration characteristics of cement-improved loess under dry-wet and freeze-thaw cycles.

The effects of cement dosage, compaction coefficient, molding method (vertical vibration method and static pressure method), and dry-wet and freeze-thaw cycles on the mechanical strength of cement-improved loess (CIL) were studied to reveal its strength degradation law under dry-wet and freeze-thaw...

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Autores principales:	Ying-Jun Jiang, Chen-Yang Ni, Hong-Wei Sha, Zong-Hua Li, Lu-Yao Cai
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/9311083731414107abfb36117e5dbd29
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spelling	oai:doaj.org-article:9311083731414107abfb36117e5dbd292021-12-02T20:05:16ZDeterioration characteristics of cement-improved loess under dry-wet and freeze-thaw cycles.1932-620310.1371/journal.pone.0253199https://doaj.org/article/9311083731414107abfb36117e5dbd292021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0253199https://doaj.org/toc/1932-6203The effects of cement dosage, compaction coefficient, molding method (vertical vibration method and static pressure method), and dry-wet and freeze-thaw cycles on the mechanical strength of cement-improved loess (CIL) were studied to reveal its strength degradation law under dry-wet and freeze-thaw cycles. Results show that when using the vertical vibration molding method, the strength degradation effect of CIL can be improved by increasing the cement dosage and compaction coefficient; however, it is not obvious. Under the action of dry-wet cycle, damages, such as voids and cracks of CIL, develop continuously. Further, the strength deteriorates continuously and does not decrease after more than 15 dry-wet cycles. Therefore, the dry-wet cycle degradation system is selected by considering the most unfavorable conditions. In the process of freeze-thaw alternation, the pores and fissures of CIL develop and evolve continuously and the strength deteriorates continuously under the joint influence of water and low temperature. The strength tends to become stable after more than 12 freeze-thaw cycles. According to the safety principle, the deterioration coefficient of the freeze-thaw cycles is 0.3.Ying-Jun JiangChen-Yang NiHong-Wei ShaZong-Hua LiLu-Yao CaiPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 7, p e0253199 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Ying-Jun Jiang Chen-Yang Ni Hong-Wei Sha Zong-Hua Li Lu-Yao Cai Deterioration characteristics of cement-improved loess under dry-wet and freeze-thaw cycles.
description	The effects of cement dosage, compaction coefficient, molding method (vertical vibration method and static pressure method), and dry-wet and freeze-thaw cycles on the mechanical strength of cement-improved loess (CIL) were studied to reveal its strength degradation law under dry-wet and freeze-thaw cycles. Results show that when using the vertical vibration molding method, the strength degradation effect of CIL can be improved by increasing the cement dosage and compaction coefficient; however, it is not obvious. Under the action of dry-wet cycle, damages, such as voids and cracks of CIL, develop continuously. Further, the strength deteriorates continuously and does not decrease after more than 15 dry-wet cycles. Therefore, the dry-wet cycle degradation system is selected by considering the most unfavorable conditions. In the process of freeze-thaw alternation, the pores and fissures of CIL develop and evolve continuously and the strength deteriorates continuously under the joint influence of water and low temperature. The strength tends to become stable after more than 12 freeze-thaw cycles. According to the safety principle, the deterioration coefficient of the freeze-thaw cycles is 0.3.
format	article
author	Ying-Jun Jiang Chen-Yang Ni Hong-Wei Sha Zong-Hua Li Lu-Yao Cai
author_facet	Ying-Jun Jiang Chen-Yang Ni Hong-Wei Sha Zong-Hua Li Lu-Yao Cai
author_sort	Ying-Jun Jiang
title	Deterioration characteristics of cement-improved loess under dry-wet and freeze-thaw cycles.
title_short	Deterioration characteristics of cement-improved loess under dry-wet and freeze-thaw cycles.
title_full	Deterioration characteristics of cement-improved loess under dry-wet and freeze-thaw cycles.
title_fullStr	Deterioration characteristics of cement-improved loess under dry-wet and freeze-thaw cycles.
title_full_unstemmed	Deterioration characteristics of cement-improved loess under dry-wet and freeze-thaw cycles.
title_sort	deterioration characteristics of cement-improved loess under dry-wet and freeze-thaw cycles.
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/9311083731414107abfb36117e5dbd29
work_keys_str_mv	AT yingjunjiang deteriorationcharacteristicsofcementimprovedloessunderdrywetandfreezethawcycles AT chenyangni deteriorationcharacteristicsofcementimprovedloessunderdrywetandfreezethawcycles AT hongweisha deteriorationcharacteristicsofcementimprovedloessunderdrywetandfreezethawcycles AT zonghuali deteriorationcharacteristicsofcementimprovedloessunderdrywetandfreezethawcycles AT luyaocai deteriorationcharacteristicsofcementimprovedloessunderdrywetandfreezethawcycles
_version_	1718375496128921600

Deterioration characteristics of cement-improved loess under dry-wet and freeze-thaw cycles.

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