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Hydraulic and mechanical behaviour of cement-bentonite mixtures containing HYPER clay: impact of sulfate attack

Gemmina Di Emidio UGent, Ramiro Verastegui Flores UGent, Claudia Scipioni, Evelina Fratalocchi and Adam Bezuijen UGent (2015) Advances in Soil Mechanics and Geotechnical Engineering. 6. p.1002-1009
abstract
Cemented clays are regularly employed as cut-off walls to isolate polluted soils or in ground improvement technologies. The objective of this research was to evaluate the performance of a polymer-treated bentonite (HYPER clay) and its impact on hydraulic and mechanical properties of cement-bentonite (CB) mixtures in contact with sulfates. In this research, bender elements were installed in a hydraulic conductivity cell, to simultaneously monitor the small-strain shear modulus (G(0)) and the hydraulic conductivity (k) of cement-bentonite mixtures. Initially, during permeation with deionized water, an increase of G0 with time was observed, due to cement hydration (hardening). Conversely, after prolonged permeation with sulfates, a decrease of G0 and a gradual increase of k are expected due to degradation of the cemented material. Preliminary results show that k of mixtures containing untreated bentonite increases due to contact with sulfates; conversely, k of mixtures containing HYPER clay remains unaffected. The stiffness modulus G0 was not significantly affected after a sulfate contact period of about 100 days in none of the cement-bentonite mixtures. More extensive monitoring is required for evaluating long-term mechanical degradation. These observations suggest that the use of polymer-treated bentonites could improve the resistance of cement-bentonite mixtures to sulfate attack maintaining a low hydraulic conductivity.
Please use this url to cite or link to this publication:
author
organization
year
type
conference (proceedingsPaper)
publication status
published
subject
keyword
Clay, bender element, sulfate attack, stiffness, cement, hydraulic conductivity, BENDER ELEMENT TESTS
in
Advances in Soil Mechanics and Geotechnical Engineering
editor
VA Rinaldi, ME Zeballos and JJ Claria
volume
6
issue title
DEFORMATION CHARACTERISTICS OF GEOMATERIALS
pages
1002 - 1009
publisher
IOS PRESS,
place of publication
NIEUWE HEMWEG 6B, 1013 BG AMSTERDAM, NETHERLANDS
conference name
6th International Symposium on Deformation Characteristics of Geomaterials
conference location
Buenos Aires, Argentina
conference start
2015-11-15
conference end
2015-11-18
Web of Science type
Proceedings Paper
Web of Science id
000376071400100
ISBN
978-1-61499-600-2
978-1-61499-601-9
DOI
10.3233/978-1-61499-601-9-1002
project
-
language
English
UGent publication?
yes
classification
P1
copyright statement
I have transferred the copyright for this publication to the publisher
id
8033495
handle
http://hdl.handle.net/1854/LU-8033495
date created
2016-07-10 11:34:03
date last changed
2017-01-02 09:53:20
@inproceedings{8033495,
  abstract     = {Cemented clays are regularly employed as cut-off walls to isolate polluted soils or in ground improvement technologies. The objective of this research was to evaluate the performance of a polymer-treated bentonite (HYPER clay) and its impact on hydraulic and mechanical properties of cement-bentonite (CB) mixtures in contact with sulfates. In this research, bender elements were installed in a hydraulic conductivity cell, to simultaneously monitor the small-strain shear modulus (G(0)) and the hydraulic conductivity (k) of cement-bentonite mixtures. Initially, during permeation with deionized water, an increase of G0 with time was observed, due to cement hydration (hardening). Conversely, after prolonged permeation with sulfates, a decrease of G0 and a gradual increase of k are expected due to degradation of the cemented material. Preliminary results show that k of mixtures containing untreated bentonite increases due to contact with sulfates; conversely, k of mixtures containing HYPER clay remains unaffected. The stiffness modulus G0 was not significantly affected after a sulfate contact period of about 100 days in none of the cement-bentonite mixtures. More extensive monitoring is required for evaluating long-term mechanical degradation. These observations suggest that the use of polymer-treated bentonites could improve the resistance of cement-bentonite mixtures to sulfate attack maintaining a low hydraulic conductivity.},
  author       = {Di Emidio, Gemmina and Verastegui Flores, Ramiro and Scipioni, Claudia and Fratalocchi, Evelina and Bezuijen, Adam},
  booktitle    = {Advances in Soil Mechanics and Geotechnical Engineering},
  editor       = {Rinaldi, VA and Zeballos, ME and Claria, JJ},
  isbn         = {978-1-61499-600-2},
  keyword      = {Clay,bender element,sulfate attack,stiffness,cement,hydraulic conductivity,BENDER ELEMENT TESTS},
  language     = {eng},
  location     = {Buenos Aires, Argentina},
  pages        = {1002--1009},
  publisher    = {IOS PRESS,},
  title        = {Hydraulic and mechanical behaviour of cement-bentonite mixtures containing HYPER clay: impact of sulfate attack},
  url          = {http://dx.doi.org/10.3233/978-1-61499-601-9-1002},
  volume       = {6},
  year         = {2015},
}

Chicago
Di Emidio, Gemmina, Ramiro Verastegui Flores, Claudia Scipioni, Evelina Fratalocchi, and Adam Bezuijen. 2015. “Hydraulic and Mechanical Behaviour of Cement-bentonite Mixtures Containing HYPER Clay: Impact of Sulfate Attack.” In Advances in Soil Mechanics and Geotechnical Engineering, ed. VA Rinaldi, ME Zeballos, and JJ Claria, 6:1002–1009. NIEUWE HEMWEG 6B, 1013 BG AMSTERDAM, NETHERLANDS: IOS PRESS,.
APA
Di Emidio, G., Verastegui Flores, R., Scipioni, C., Fratalocchi, E., & Bezuijen, A. (2015). Hydraulic and mechanical behaviour of cement-bentonite mixtures containing HYPER clay: impact of sulfate attack. In V. Rinaldi, M. Zeballos, & J. Claria (Eds.), Advances in Soil Mechanics and Geotechnical Engineering (Vol. 6, pp. 1002–1009). Presented at the 6th International Symposium on Deformation Characteristics of Geomaterials, NIEUWE HEMWEG 6B, 1013 BG AMSTERDAM, NETHERLANDS: IOS PRESS,.
Vancouver
1.
Di Emidio G, Verastegui Flores R, Scipioni C, Fratalocchi E, Bezuijen A. Hydraulic and mechanical behaviour of cement-bentonite mixtures containing HYPER clay: impact of sulfate attack. In: Rinaldi V, Zeballos M, Claria J, editors. Advances in Soil Mechanics and Geotechnical Engineering. NIEUWE HEMWEG 6B, 1013 BG AMSTERDAM, NETHERLANDS: IOS PRESS,; 2015. p. 1002–9.
MLA
Di Emidio, Gemmina, Ramiro Verastegui Flores, Claudia Scipioni, et al. “Hydraulic and Mechanical Behaviour of Cement-bentonite Mixtures Containing HYPER Clay: Impact of Sulfate Attack.” Advances in Soil Mechanics and Geotechnical Engineering. Ed. VA Rinaldi, ME Zeballos, & JJ Claria. Vol. 6. NIEUWE HEMWEG 6B, 1013 BG AMSTERDAM, NETHERLANDS: IOS PRESS,, 2015. 1002–1009. Print.