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Effects of fines on the strength characteristics of mixtures
Jiang, Xiangang1,2; Cui, Peng1,3; Ge, Yonggang1
Corresponding AuthorJiang, XG
AbstractMixtures composed of coarse and fine particles are complicated inhomogeneous materials and are widely encountered in nature. Mixtures with different fines contents have different strength characteristics, and the study of these characteristics is still nascent. To analyze the relationships between fines concentration and strength, 27 unconfined compressive tests and 27 radial-splitting tests with 9 different fines contents were conducted. Laboratory tests on samples with different fines concentrations indicated that the percentages of fines in the mixtures significantly impacted their strength, and 3 regions could be identified. The compressive strength of the mixture increased slowly with increasing fines content for fines concentrations of <55% by weight, rapidly for fines concentrations of 55% to 75% by weight, and slowly again for fines concentrations >75% by weight. The tensile strength increased slowly when the fines content was less than 45%, quickly for concentrations from 45% to 85% by weight, and then slowly for concentrations >85%. The maximum compressive and shear strengths (95% fines concentration) were approximately 25 times greater than the minimum strengths (5% fines concentration). Meanwhile, the maximum tensile strengths were 50 times greater than the minimum values, but the strain values only differed by a factor of 3 regardless of mode (compressive or tensile). The fines had stronger effects on the strengths of the mixtures than their strains. As a whole, the ratio of different compressive-tensile strength lines varied by fines concentration. Based on the relationships between compressive and tensile strengths, a new strength criterion was established. Three additional unconfined compressive, radial-splitting, and direct shear tests were conducted to verify the rationality of the new criterion. The results indicated that values calculated by the criterion were in good agreement with the tested data. Comparison and analysis revealed that the surfaces between coarse and fine particles were weak zones. The fines influenced the strength by modifying these zones. This finding reveals how fines affect the strength of mixtures for a fixed void ratio. (C) 2015 Elsevier B.V. All rights reserved.
KeywordFines Mixtures Strength
WOS HeadingsScience & Technology ; Technology ; Physical Sciences
WOS Subject ExtendedEngineering ; Geology
Indexed BySCI
WOS SubjectEngineering, Geological ; Geosciences, Multidisciplinary
WOS IDWOS:000364894000007
Funding OrganizationKey Project of the Chinese Academy of Science(KZZD-EW-05-01) ; External Cooperation Program of BIC(131551KYSB20130003) ; Sichuan Science and Technology Support Project(2014SZ0163) ; National Natural Science Foundation of China(41171012)
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Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Hazards & Surface Proc, Chengdu 610044, Sichuan, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
Jiang, Xiangang,Cui, Peng,Ge, Yonggang. Effects of fines on the strength characteristics of mixtures[J]. ENGINEERING GEOLOGY,2015,198:78-86.
APA Jiang, Xiangang,Cui, Peng,&Ge, Yonggang.(2015).Effects of fines on the strength characteristics of mixtures.ENGINEERING GEOLOGY,198,78-86.
MLA Jiang, Xiangang,et al."Effects of fines on the strength characteristics of mixtures".ENGINEERING GEOLOGY 198(2015):78-86.
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