Hydraulic and mechanical behaviour of cement-bentonite mixtures containing HYPER clay: impact of sulfate attack
- Author
- Gemmina Di Emidio (UGent) , Ramiro Verastegui Flores (UGent) , Claudia Scipioni, Evelina Fratalocchi (UGent) and Adam Bezuijen (UGent)
- Organization
- 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.
- Keywords
- Clay, bender element, sulfate attack, stiffness, cement, hydraulic conductivity, BENDER ELEMENT TESTS
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Please use this url to cite or link to this publication: http://hdl.handle.net/1854/LU-8033495
- MLA
- Di Emidio, Gemmina, et al. “Hydraulic and Mechanical Behaviour of Cement-Bentonite Mixtures Containing HYPER Clay: Impact of Sulfate Attack.” Advances in Soil Mechanics and Geotechnical Engineering, edited by VA Rinaldi et al., vol. 6, IOS PRESS, 2015, pp. 1002–09, doi:10.3233/978-1-61499-601-9-1002.
- 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). https://doi.org/10.3233/978-1-61499-601-9-1002
- Chicago author-date
- 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, edited by VA Rinaldi, ME Zeballos, and JJ Claria, 6:1002–9. NIEUWE HEMWEG 6B, 1013 BG AMSTERDAM, NETHERLANDS: IOS PRESS,. https://doi.org/10.3233/978-1-61499-601-9-1002.
- Chicago author-date (all authors)
- 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 by. VA Rinaldi, ME Zeballos, and JJ Claria, 6:1002–1009. NIEUWE HEMWEG 6B, 1013 BG AMSTERDAM, NETHERLANDS: IOS PRESS,. doi:10.3233/978-1-61499-601-9-1002.
- 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.
- IEEE
- [1]G. Di Emidio, R. Verastegui Flores, C. Scipioni, E. Fratalocchi, and A. Bezuijen, “Hydraulic and mechanical behaviour of cement-bentonite mixtures containing HYPER clay: impact of sulfate attack,” in Advances in Soil Mechanics and Geotechnical Engineering, Buenos Aires, Argentina, 2015, vol. 6, pp. 1002–1009.
@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}},
keywords = {{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://doi.org/10.3233/978-1-61499-601-9-1002}},
volume = {{6}},
year = {{2015}},
}
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