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Low-pH cement mortar-bentonite perturbations in a small-scale pilot laboratory experiment

Published online by Cambridge University Press:  02 July 2018

D.E. González-Santamaría ,
M. Angulo ,
A.I. Ruiz ,
R. Fernández ,
A. Ortega  and
J. Cuevas
D.E. González-Santamaría
Affiliation:
Departamento de Geología y Geoquímica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco s/n, 28049 Madrid, Spain
M. Angulo
Affiliation:
Departamento de Geología y Geoquímica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco s/n, 28049 Madrid, Spain
A.I. Ruiz
Affiliation:
Departamento de Geología y Geoquímica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco s/n, 28049 Madrid, Spain
R. Fernández
Affiliation:
Departamento de Geología y Geoquímica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco s/n, 28049 Madrid, Spain
A. Ortega
Affiliation:
Departamento de Geología y Geoquímica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco s/n, 28049 Madrid, Spain
J. Cuevas*
Affiliation:
Departamento de Geología y Geoquímica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco s/n, 28049 Madrid, Spain
*
*E-mail: [email protected]
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Abstract

A novel method to perform small-scale laboratory experiments that reproduce concrete–bentonite and concrete–groundwater interactions has been developed. Such interfaces will prevail in engineered barrier systems used for isolation of nuclear waste. With the goal of optimizing the experimental method, this work has analysed the geochemical interaction of distilled water, low-pH cement mortar and FEBEX-bentonite for 75 days. Limited but evident reactivity between the materials was observed, mainly decalcification in cement mortar, carbonation at the interface with bentonite and Mg enrichment in bentonite. These results are consistent with the state-of-the-art literature and were used to validate this small-scale pilot laboratory experiment to establish the basis for further studies comparing the behaviour of different buffer and cement materials.

Keywords

radioactive waste confinementalkaline alterationlow-pH cementsbentonitelaboratory experiments
Type
Article
Information
Clay Minerals , Volume 53 , Issue 2 , June 2018 , pp. 237 - 254
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2018 

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Footnotes

This paper was originally presented during the session: ‘ES-04 Clay barriers performance in the long-term isolation of waste’ of the International Clay Conference 2017.

Guest Associate Editor: M.V. Villar

References

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