Acid induced degradation of the bentonite component used in geosynthetic clay liners

被引：47

作者：

Liu, Yang ^{[1
]}

Gates, Will P. ^{[1
]}

Bouazza, Abdelmalek ^{[1
]}

机构：

[1] Monash Univ, Dept Civil Engn, Melbourne, Vic 3800, Australia

来源：

GEOTEXTILES AND GEOMEMBRANES | 2013年 / 36卷

关键词：

Bentonite; Geosynthetic clay liners; Acid solutions; X-ray diffraction; Infrared spectroscopy; HYDRAULIC CONDUCTIVITY; GAS-PERMEABILITY; CATION-EXCHANGE; FT-IR; DISSOLUTION; ACTIVATION; DIFFUSION; SI-29;

D O I：

10.1016/j.geotexmem.2012.10.011

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

Bentonite is a natural clay mineral widely used in the mining and solid waste containment industry, for example, as a soil mixture for the construction of seepage barriers, or as a component of geosynthetic clay liners (GCLs), to provide low hydraulic conductivity. However, degradation of bentonites generally occurs when permeated with acid solutions, such as encountered in mining applications, which may influence physical properties, and particularly, the hydraulic performance of geosynthetic clay liners. In this paper, properties such as Atterberg limits, free swell index, and fluid loss of three bentonites were measured with different concentrations of sulphuric acid solutions. These properties were found to deteriorate even with low (0.015 M) sulphuric acid solutions; higher concentrations (up to 1 M) resulted in larger degradation. X-ray diffraction and infrared spectroscopy were used to monitor the change of bentonites after interaction with the acid solutions. Acid leachates in general result in the overall degradation of the hydraulic performance of geosynthetic clay liners and potentially, any bentonite-soil mixture. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：71 / 80

页数：10

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