Effect of groundwater chemistry on the swelling behavior of a Ca-bentonite for deep geological repository

NCUIR > Engineering College > Department of Civil Engineering > journal & Dissertation > Item 987654321/99774

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/99774

Title:	Effect of groundwater chemistry on the swelling behavior of a Ca-bentonite for deep geological repository
Authors:	黃偉慶;Chen, Wen-Chuan;Huang, Wei-Hsing
Contributors:	工學院土木工程學系
Keywords:	Bentonite;Geological repository;Groundwater chemistry;Swelling
Date:	2013-06-27
Issue Date:	2026-04-21 13:35:16 (UTC+8)
Publisher:	Elsevier Ltd.;Elsevier Ltd
Abstract:	摘要： •We evaluate the swelling behavior of a locally available clay.•Free swells in NaCl, CaCl2, and Na2SO4 solutions at various concentration levels.•The formation of quasi-crystals reduces the swelling strain of Ca-bentonite. The swelling properties of buffer material for high level radioactive waste repository in a near-field environment are of particular importance for achieving the low permeability sealing function. In this study, the free swelling behavior of a potential buffer material Zhisin clay is evaluated under simulated groundwater conditions such as immersion in NaCl, CaCl2, and Na2SO4 solutions at various concentrations. Experimental results indicate that Zhisin clay, being a Ca-bentonite, exhibits reduced swelling strain in salt solutions. The amount of decrease in swelling strain upon saline water intrusion is affected by both the type and concentration of electrolyte. At the same concentration, the swelling strains in CaCl2 solution are lower than those in NaCl solution due to the quasi-crystals formed in the presence of calcium ions. Also, the swells in Na2SO4 solution are found to be lower than those in NaCl solution. This is attributed to the precipitation of CaSO4, which acts as binding agent and results in aggregation of clay particles. 出版者： Elsevier Ltd 出版日期： 2013 出處： Physics and chemistry of the earth. Parts A/B/C, 2013, Vol.65, p.42-49 版權： 2013 Elsevier Ltd 識別號： ISSN: 1474-7065 識別號： EISSN: 1873-5193 識別號： DOI: 10.1016/j.pce.2013.05.012
Appears in Collections:	[Department of Civil Engineering] journal & Dissertation

Files in This Item:

File	Description	Size	Format
index.html		0Kb	HTML	12	View/Open

社群 sharing

Loading...