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Hydrothermal alterations of Bentonites in Almeria (Spain); Alteracion hidrotermal de las bentonitas de Almeria

Abstract

The use of bentonite as backfilling and sealing material in the high level radioactive waste disposals has been treated in previous studies accomplished by different authors. However, the use of this clayey barrier needs the resolution of different problems so that its efficiency will be enhanced. between those could be cited the study of the actual capacity of sealing the space around the canister and the accommodation to the pressure of the rocky environment; the possible variations in plasticity; the diffusion and reaction processes that can be produced through the barrier by groundwater, the capacity of radionuclides adsorption, etc. These studies, show that the bentonites with high content in smectite fulfill satisfactorily with the physical and chemical conditions to be used as sealing material, but it is known that the smectite can be unstable in diagenetic conditions similar to those are given in a deep repository of radioactive wastes, being transformed into illite. A conclusion of immediate interest is deduced from this last study. The bentonites used as sealing material in radioactive waste repositories must no contain Na as interlayer cation since it is very easily exchangeable by K. It is better to select those smectites with Ca and Mg  More>>
Publication Date:
Dec 01, 1996
Product Type:
Technical Report
Report Number:
ENRESA-06/96
Reference Number:
SCA: 052002; 580000; PA: SP-96:0E0515; EDB-97:018889; SN: 96001705473
Resource Relation:
Other Information: PBD: 1996
Subject:
05 NUCLEAR FUELS; 58 GEOSCIENCES; BENTONITE; HYDROTHERMAL ALTERATION; RADIOACTIVE WASTE STORAGE; PHYSICAL PROPERTIES; SPAIN; RADIOACTIVE WASTE DISPOSAL; ROCK-FLUID INTERACTIONS; HYDRAULIC CONDUCTIVITY; SMECTITE
OSTI ID:
420338
Research Organizations:
Empresa Nacional de Residuos Radiactivos SA, Madrid (Spain)
Country of Origin:
Spain
Language:
Spanish
Other Identifying Numbers:
Other: ON: DE97717548; TRN: ES96E0515
Availability:
OSTI as DE97717548
Submitting Site:
SP
Size:
159 p.
Announcement Date:

Citation Formats

Linares Gonzalez, J, Barahona Fernandez, E, Huertas Garcia, F, Caballero Mesa, E, and Cuadros Ojeda, J. Hydrothermal alterations of Bentonites in Almeria (Spain); Alteracion hidrotermal de las bentonitas de Almeria. Spain: N. p., 1996. Web.
Linares Gonzalez, J, Barahona Fernandez, E, Huertas Garcia, F, Caballero Mesa, E, & Cuadros Ojeda, J. Hydrothermal alterations of Bentonites in Almeria (Spain); Alteracion hidrotermal de las bentonitas de Almeria. Spain.
Linares Gonzalez, J, Barahona Fernandez, E, Huertas Garcia, F, Caballero Mesa, E, and Cuadros Ojeda, J. 1996. "Hydrothermal alterations of Bentonites in Almeria (Spain); Alteracion hidrotermal de las bentonitas de Almeria." Spain.
@misc{etde_420338,
title = {Hydrothermal alterations of Bentonites in Almeria (Spain); Alteracion hidrotermal de las bentonitas de Almeria}
author = {Linares Gonzalez, J, Barahona Fernandez, E, Huertas Garcia, F, Caballero Mesa, E, and Cuadros Ojeda, J}
abstractNote = {The use of bentonite as backfilling and sealing material in the high level radioactive waste disposals has been treated in previous studies accomplished by different authors. However, the use of this clayey barrier needs the resolution of different problems so that its efficiency will be enhanced. between those could be cited the study of the actual capacity of sealing the space around the canister and the accommodation to the pressure of the rocky environment; the possible variations in plasticity; the diffusion and reaction processes that can be produced through the barrier by groundwater, the capacity of radionuclides adsorption, etc. These studies, show that the bentonites with high content in smectite fulfill satisfactorily with the physical and chemical conditions to be used as sealing material, but it is known that the smectite can be unstable in diagenetic conditions similar to those are given in a deep repository of radioactive wastes, being transformed into illite. A conclusion of immediate interest is deduced from this last study. The bentonites used as sealing material in radioactive waste repositories must no contain Na as interlayer cation since it is very easily exchangeable by K. It is better to select those smectites with Ca and Mg that detain the entry of K in the interlayer and as a consequence the transformation process of smectite into illite is made more difficult. (Author)}
place = {Spain}
year = {1996}
month = {Dec}
}