Water Science & Technology: Water Supply Vol 1 No 1 pp 25–32 © IWA Publishing 2001
The role of solution chemistry in the stability and detachment of cohesive
kaolinite particles
V Ravisangar*, BM Brouckaert**, A Amirtharajah*** and TW Sturm****
*
School of Civil and Environmental Engineering,
Georgia Institute of Technology, Atlanta, GA 30332, USA
**
School of Civil and Environmental Engineering,
Georgia Institute of Technology, Atlanta, GA 30332, USA
***
School of Civil and Environmental Engineering,
Georgia Institute of Technology, Atlanta, GA 30332, USA
****
School of Civil and Environmental Engineering,
Georgia Institute of Technology, Atlanta, GA 30332, USA
ABSTRACT
The effect of solution chemistry on the behavior of kaolinite in three
different situations was investigated: (1) the detachment of kaolinite
from glass beads in a fluidized bed, (2) the erosion of kaolinite deposits
in a laboratory flume and (3) the determination of the stress-strain rate
relationship of concentrated suspensions in a rheometer. The experimental
results from these three different approaches could be explained in terms
of changes in mode of particle associations which in turn could be
characterized in terms of a micromechanical force model which predicts
the effect of solution chemistry on the interaction force between
adjacent particle surfaces. Understanding the relationship between
solution and surface chemistry on the structure, mechanical strength
and mechanism of erosion of cohesive sediment deposits is an important
step towards developing predictive models of a number of processes
including erosion of cohesive sediments in streams and estuaries, and
detachment of particles from granular media during filtration and filter
backwashing.
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