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

doi:10.1016/j.clay.2018.02.003

CORC > 青海盐湖研究所 > 中国科学院青海盐湖研究所 > 盐湖资源与化学实验室

	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
刊名	APPLIED CLAY SCIENCE
	2018-09-01
卷号	161 页码:524-532
ISSN号	0169-1317
DOI	10.1016/j.clay.2018.02.003
英文摘要	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.
内容类型	期刊论文
源URL	[http://ir.isl.ac.cn/handle/363002/34483]
专题	青海盐湖研究所_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.