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Effects of clay content on the volumetric behavior of loess under heating-cooling cycles
Mu Qing-yi1; Ng Charles Wang-wai2; Zhou Chao3; Zhou Gordon Gong-dan4
Corresponding AuthorZhou, Chao(c.zhou@polyu.edu.hk)
2019
Source PublicationJOURNAL OF ZHEJIANG UNIVERSITY-SCIENCE A
ISSN1673-565X
EISSN1862-1775
Volume20Issue:12Pages:979-990
SubtypeArticle
Contribution Rank4
AbstractAlthough numerous studies have been carried out on investigating thermal volume changes in different soils, limited attention has been paid to loess. This study aims to investigate the effects of clay content on the deformation of loess under heating-cooling cycles. Three soils with different clay contents (i.e. SA: 7%; SB: 13%; SC: 35%) were prepared with loess collected in situ through the sedimentation method. The soil volume changes were measured under heating-cooling cycles by using a thermal invar oedometer. To interpret the experimental results, X-ray diffraction (XRD) and scanning electron microscope (SEM) tests were conducted to identify the composition and microstructure of tested soils, respectively. The results show that the plastic axial strains of SA, SB, and SC accumulate to a certain level with the increasing number of heating-cooling cycles. At the stable state, the plastic axial strain of SC is 264% and 52% larger than those of SA and SB, respectively. On the other hand, the linear thermal expansion coefficient of SC is 66% and 20% larger than those of SA and SB, respectively. As evidenced from the XRD test, the clay in loess mainly contains kaolinite, chlorite, and illite, while the composition of silt is dominated by quartz. The clay minerals are more sensitive to thermal fluctuations than quartz because of the electrical double layer. SC, whose clay content is deliberately enhanced, exhibits a larger plastic axial strain and linear thermal expansion coefficient than do SA and SB.
KeywordLoess Volumetric behavior Clay mineral Heating-cooling cycles
DOI10.1631/jzus.A1900274
Indexed BySCI
WOS KeywordSATURATED CLAYS ; UNFROZEN WATER ; LANDFILL COVER ; VOID RATIO ; SUCTIONS ; MODEL ; SAND
Language英语
Funding ProjectKey Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS)[QYZDB-SSW-DQC010] ; Youth Innovation Promotion Association, CAS ; Research Grants Council of the Hong Kong Special Administrative Region[16204817] ; Research Grants Council of the Hong Kong Special Administrative Region[16207417] ; Research Grants Council of the Hong Kong Special Administrative Region[AoE/E-603/18] ; National Natural Science Foundation of China[51909205] ; China Postdoctoral Science Foundation[2018M631166] ; China Postdoctoral Science Foundation[2019T120914]
WOS Research AreaEngineering ; Physics
WOS SubjectEngineering, Multidisciplinary ; Physics, Applied
WOS IDWOS:000511683500007
Funding OrganizationKey Research Program of Frontier Sciences, Chinese Academy of Sciences (CAS) ; Youth Innovation Promotion Association, CAS ; Research Grants Council of the Hong Kong Special Administrative Region ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation
PublisherZHEJIANG UNIV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/33884
Collection山地灾害与地表过程重点实验室
Corresponding AuthorZhou Chao
Affiliation1.Department of Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, China;
2.Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong 999077, China;
3.Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong 999077, China;
4.Key Laboratory of Mountain Hazards and Earth Surface Process, Chinese Academy of Sciences (CAS), Chengdu 610041, China
Recommended Citation
GB/T 7714
Mu Qing-yi,Ng Charles Wang-wai,Zhou Chao,et al. Effects of clay content on the volumetric behavior of loess under heating-cooling cycles[J]. JOURNAL OF ZHEJIANG UNIVERSITY-SCIENCE A,2019,20(12):979-990.
APA Mu Qing-yi,Ng Charles Wang-wai,Zhou Chao,&Zhou Gordon Gong-dan.(2019).Effects of clay content on the volumetric behavior of loess under heating-cooling cycles.JOURNAL OF ZHEJIANG UNIVERSITY-SCIENCE A,20(12),979-990.
MLA Mu Qing-yi,et al."Effects of clay content on the volumetric behavior of loess under heating-cooling cycles".JOURNAL OF ZHEJIANG UNIVERSITY-SCIENCE A 20.12(2019):979-990.
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