Deakin University
Browse

File(s) under permanent embargo

Colloidal aspects of incompatibility reactions of bentonite with saline leachates as indicated from a modified fluid loss test

journal contribution
posted on 2019-01-01, 00:00 authored by Andras Fehervari, Will GatesWill Gates, Yang Liu, Abdelmalek Bouazza, Alla Marchuk, Serhiy Marchuk, Terence Turney, Antonio Patti
The fluid loss test has been used by geotechnical engineers for rapid evaluation of the hydraulic barrier properties of bentonites. In this study, a modified fluid loss test, along with visocmetric and electrophoretic mobility measurements, was used to assess the colloidal interactions of three powdered sodium bentonites with saline leachates, namely 0 to 2 N solutions of NaCl and CaCl2. The results indicate that the fluid loss test provides robust and reliable information on the water retention of bentonite, moreover, it gives information on the aggregate structure, size and settling of bentonite flocs and on the high-salt stabilization phenomena (packing and densification of clay aggregates) in saline leachates. Quantifying the water retention characteristics, along with the colloidal (i.e. flocculation) behaviour, using the fluid loss test, provides detailed understanding of barrier properties of bentonites important for various applications (e.g. barrier systems, dewatering etc.).

History

Journal

Canadian geotechnical journal

Volume

56

Issue

10

Pagination

1406 - 1417

Publisher

NRC Research Press

Location

Ottawa, Ont.

ISSN

0008-3674

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2018, the authors