Changes in micromechanical properties of Na-montmorillonite caused by CO2/H2O sorption

doi:10.1016/j.commatsci.2016.12.024

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	Changes in micromechanical properties of Na-montmorillonite caused by CO2/H2O sorption
	Fang, Z. M.2; Zhang, W. N.1,2; Hu, H. X.2; Li, X. C.2
刊名	COMPUTATIONAL MATERIALS SCIENCE
	2017
卷号	129 页码:178-183
关键词	Na-montmorillonite Sorption Bulk modulus Hydrostatic test Elastic stiffness
ISSN号	0927-0256
DOI	10.1016/j.commatsci.2016.12.024
英文摘要	CO2/H2O intercalation causes changes in the elastic mechanical properties of clay. This phenomenon is critical to geologic carbon sequestration (GCS) and enhancing oil rate (EOR) via CO2 adsorption. In this work, the elastic stiffness and hydrostatic mechanical behavior of Na-montmorillonite (MMT) exposure to variable component of CO2/H2O mixture are investigated using combinations of Monte Carlo and Molecular Dynamic methods. In the hydrostatic test simulation of 1 W and 2 W hydrated state, volume and basal spacing d(001) linearly decrease with the increasing hydrostatic pressure. Moreover, gradients of 1 W hydrated state are smaller than that of the gradients of 2 W hydrated state. The linear gradient is related to the elastic modulus. Therefore higher hydrated state results in softer structure. Additionally, the yielding bulk modulus linearly decreases with the pressure. The decreasing gradient almost keeps at a constant of 1.0 GPa/GPa with variable component of CO2/H2O. At the super critical condition of CO2 (P= 0.01 GPa, T= 304.5 K), the elastic stiffness fluctuates with the variable component of H2O/CO2. CO2 intercalation strongly affects the out-of-plane elastic stiffness while has little influence on the in plane stiffness. (C) 2016 Elsevier B.V. All rights reserved.
WOS研究方向	Materials Science
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000394065000021
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/4021]
专题	岩土力学所知识全产出_期刊论文
作者单位	1.Univ Chinese Acad Sci, 19 A Yuquan Rd ; 2.Chinese Acad Sci, Inst Rock & Soil Mech
推荐引用方式 GB/T 7714	Fang, Z. M.,Zhang, W. N.,Hu, H. X.,et al. Changes in micromechanical properties of Na-montmorillonite caused by CO2/H2O sorption[J]. COMPUTATIONAL MATERIALS SCIENCE,2017,129:178-183.
APA	Fang, Z. M.,Zhang, W. N.,Hu, H. X.,&Li, X. C..(2017).Changes in micromechanical properties of Na-montmorillonite caused by CO2/H2O sorption.COMPUTATIONAL MATERIALS SCIENCE,129,178-183.
MLA	Fang, Z. M.,et al."Changes in micromechanical properties of Na-montmorillonite caused by CO2/H2O sorption".COMPUTATIONAL MATERIALS SCIENCE 129(2017):178-183.