Hydraulic performance of activated calcium bentonite treated by polyionic charged polymer

Razakamanantsoa, Andry R., Barast, Gilles and Djeran-maigre, Irini (2012) Hydraulic performance of activated calcium bentonite treated by polyionic charged polymer. Applied Clay Science, 59-60 103-114. doi:10.1016/j.clay.2012.01.022


Author Razakamanantsoa, Andry R.
Barast, Gilles
Djeran-maigre, Irini
Title Hydraulic performance of activated calcium bentonite treated by polyionic charged polymer
Journal name Applied Clay Science   Check publisher's open access policy
ISSN 0169-1317
1872-9053
Publication date 2012-05
Sub-type Critical review of research, literature review, critical commentary
DOI 10.1016/j.clay.2012.01.022
Open Access Status
Volume 59-60
Start page 103
End page 114
Total pages 12
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Abstract The present paper discusses the hydro mechanical behavior of activated Ca-bentonite mixed with two soluble polyelectrolyte powder polymers. To understand better the clay polymer interaction, swelling, water adsorption and hydraulic performance are studied. Synthetized leachate (LS) is used to reproduce the hydrochemical phenomena in the system. Hydraulic performance tests were performed with an oedopermeameter and modified API filter press. Both methods gave the similar bentonite material behaviors and classification order, showing that polymers are reducing the permeability, in contact with the LS. Water adsorption and free swell index tests results have confirmed that (1) adsorption, swelling and permeability parameters are linked for clay polymer mixtures and (2) the polymers could improve the overall clay properties. Each polymer has a different effect: the anionic polymer induces a low permeability to the mixture; the cationic polymer makes the bentonite more swellable, with high ability to retain water and to become more resistant to the LS. Laboratory tests results demonstrate that the behavior of bentonite polymer mixtures for landfill liner applications depends essentially on the nature of the surface charge of the polymer.
Keyword Adsorption
Bentonite
Geosynthetic clay liners
Permeability
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Critical review of research, literature review, critical commentary
Collection: School of Civil Engineering Publications
 
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