Mineral abundances quantification to reveal the swelling property of the black cotton soil in Kenya

doi:10.1016/j.clay.2018.02.003

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	Mineral abundances quantification to reveal the swelling property of the black cotton soil in Kenya
	Miao, Shiding; Shi, Jianzhou; Sun, Yanbin; Zhang, Peng; Shen, Zhaopu; Nian, Hongen; Huang, Jinqiu; Wang, Xueqiu; Zhang, Peiping
第一作者	Miao, Shiding
	2018-09-01
发表期刊	APPLIED CLAY SCIENCE
ISSN	0169-1317
卷号	161 页码:524-532
摘要	This research provides a combination method in quantifying mineral abundances of the black cotton soil (BCS) to reveal its swelling property. The soil was sampled from a roadbed to be built in Niarobi, Kenya, and was found to experience large volumetric expansion (similar to 166%) due to the moisture variation. The wet-chemical analyses and X-ray characterizations (XRD) were undertaken to study the chemical compositions and mineral phases that are presented in the BCS. The quantification of minerals was determined by combining chemical compositions, physical properties (cation-exchange capacity = 75.5 meq 100 g(-1), hydroxyl water loss = 10.5%) and the phase identification. A local regression relationship was proposed based on the mass balance of major elements. The BCS was found to consist with clay minerals as nontronite (17.3 wt.%), smectite (10.9% wt%), chlorite (21.7 wt. %) and interstratified chlorite/smectite (31.9 wt.%). The nonclay minerals of quartz and feldspar were determined to have proportions of 10.2 wt.% and 8.4 wt.%, respectively. This evaluation was also confirmed by the electron microprobe analysis (EMPA) linked with a graphic software and experimentally by the multiple-step precipitation plus additional alkaline/acid and other chemicals treatments. The high content of Na, Ca-based clay minerals found in this work accounts for the large volumetric expansion when the BCS is exposed to water.
DOI	10.1016/j.clay.2018.02.003
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/34483
专题	盐湖资源与化学实验室
推荐引用方式 GB/T 7714	Miao, Shiding,Shi, Jianzhou,Sun, Yanbin,et al. Mineral abundances quantification to reveal the swelling property of the black cotton soil in Kenya[J]. APPLIED CLAY SCIENCE,2018,161:524-532.
APA	Miao, Shiding.,Shi, Jianzhou.,Sun, Yanbin.,Zhang, Peng.,Shen, Zhaopu.,...&Zhang, Peiping.(2018).Mineral abundances quantification to reveal the swelling property of the black cotton soil in Kenya.APPLIED CLAY SCIENCE,161,524-532.
MLA	Miao, Shiding,et al."Mineral abundances quantification to reveal the swelling property of the black cotton soil in Kenya".APPLIED CLAY SCIENCE 161(2018):524-532.

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