Influence of texture in bauxite residues on void ratio, water holding characteristics, and penetration resistance

Buchanan, S. J., So, H. B., Kopittke, P. M. and Menzies, N. W. (2010) Influence of texture in bauxite residues on void ratio, water holding characteristics, and penetration resistance. Geoderma, 158 3-4: 421-426. doi:10.1016/j.geoderma.2010.06.016

Author Buchanan, S. J.
So, H. B.
Kopittke, P. M.
Menzies, N. W.
Title Influence of texture in bauxite residues on void ratio, water holding characteristics, and penetration resistance
Journal name Geoderma   Check publisher's open access policy
ISSN 0016-7061
Publication date 2010-09
Sub-type Article (original research)
DOI 10.1016/j.geoderma.2010.06.016
Volume 158
Issue 3-4
Start page 421
End page 426
Total pages 6
Editor J. Chorover
A. E. Hartemink
I. Kögel-Knabner
A. B. McBratney
E. Perrier
M. J. Vepraskas
Place of publication Amsterdam, Netherlands
Publisher Elesevier
Collection year 2011
Language eng
Formatted abstract
The low water holding capacity of the residue sand (RS) component of bauxite refining residue limits plant growth during the prolonged dry periods. Whilst an increase in fines-content would be expected to increase the water holding capacity, it may have a detrimental impact upon other soil physical properties. Using undisturbed (puddled) mixtures in which intra-aggregate voids dominated (i.e. voids resulting from the packing characteristics of the primary mineral particles rather than from soil structure), an experiment was conducted to investigate the effect of adding fines-material to RS on plant available water content (PAWC) and penetration resistance (Pr). As predicted by the particle packing theory of binary mixtures, an increase in the fines-content of RS resulted in, first a decrease, and then an increase in the void ratio. These changes in void ratio (and pore size distribution) influenced both the PAWC and Pr of the mixtures. Initially, an increase in the fines-content tended to decrease PAWC slightly due to a decrease in the total void space. However, beyond the minimum void ratio (emin), the addition of further fines-material resulted in an increase in PAWC due to an increase in the void ratio. Trends in Pr approximated the inverse of changes in the void ratio; the addition of fines-material causing an increase in Pr in the coarse matrix (< emin) but a decrease in Pr in the fine matrix (> emin). This study suggests that in undisturbed mixtures, improvements in PAWC were identifiable only after addition of substantial quantities of fines-material. Indeed, the initial addition of fines-material to RS (i.e. < emin) not only resulted in a decrease in PAWC but an increase in Pr.
© 2010 Elsevier B.V. All rights reserved.
Keyword Bauxite residue
Penetration resistance
Plant available water content
Void ratio
Soil bulk-density
Cone index
Mechanical impedance
Size distribution
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Centre for Mined Land Rehabilitation Publications
Official 2011 Collection
School of Agriculture and Food Sciences
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 11 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 10 times in Scopus Article | Citations
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Created: Sun, 10 Oct 2010, 00:05:17 EST