Confirmation of Aqueous Polymer Sorption on Contaminant Barrier Clay Using TGA
Publication: Journal of Materials in Civil Engineering
Volume 18, Issue 2
Abstract
In order to understand the mechanism by which aqueous polymers improve the resistance of clayey barrier soils to stresses, it is important to precisely determine the quantity of polymer that is sorbed onto barrier soil from aqueous solution. Batch sorption test results performed to analyze polyacrylamide (PAM) sorption from aqueous solutions by Na-montmorillonite (Nammt) indicate that viscosity measurement provides higher sorption amounts of PAM ( of Nammt) than thermogravimetric analyzer (TGA) measurement ( of Nammt). Statistical analyses of sorption data for both methods performed at various concentrations ranging from 0.1 to show that in general, the thermogravimetry is more consistent than viscometry. The demerit of viscometry is that the amount of polymer sorbed on solids is estimated indirectly through measurements of polymer solution concentration. Some free polymer molecules may still exist within interparticle pores of the separated solid fraction and can impose higher levels of sorption than actual levels. In the case of TGA, freezing drying of samples, which is a part of the test protocol, extracts pore liquid containing polymer molecules by sublimation. This leaves behind polymer molecules that are actually sorbed on soil particles, thereby producing lesser and more realistic sorption data than viscometry can provide.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 18 • Issue 2 • April 2006
Pages: 307 - 310
Copyright
© 2006 ASCE.
History
Received: Jul 27, 2005
Accepted: Jul 29, 2005
Published online: Apr 1, 2006
Published in print: Apr 2006
Notes
Note. Associate Editor: Antonio Nanni
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