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Hydrothermal alkaline stability of bentonite barrier by concrete interstitial wastes; Alteracion alcalina hidrotermal de la barrera de bentonita por aguas intersticiales de cementos

Abstract

At present, the main source of High Level radioactive Waste (HLW) is the electrical energy production during all the steps of developing. In almost all the countries with nuclear programs, the option for the final management of HLW is the Deep Geological Repository (DGR) based on the concept of multi barrier. According to this concept, the waste is isolated from biosphere by the interposition of confinement barriers. Two of the engineering barriers in the Spanish design of DGR in granitic rock are compacted bentonite and concrete. The bentonite barrier is the backfilling and sealing material for the repository gallery, because of its mechanical and physico-chemical properties. The main qualities of concrete as a component of a multi barrier system are its low permeability, mechanical resistance and chemical properties. With regard to chemical composition of concrete, the alkaline nature of cement pore water lowers the solubility of many radioactive elements. However, structural transformation in smectite, dissolution or precipitation of minerals and, consequently, changes in the bentonite properties could occurs in the alkaline conditions generated by the cement degradation. The main objective of the present work is to evaluate the effect of concrete in the stability of Spanish reference bentonite (La Serrata  More>>
Authors:
Leguey Jimenez, S; Cuevas Rodriguez, J; Ramirez Martin, S; Vigil de la villa Mencia, R.; Martin Barca, M [1] 
  1. Universidad Autonoma de Madrid, Madrid (Spain)
Publication Date:
Jul 01, 2002
Product Type:
Technical Report
Report Number:
ENRESA-03/2002
Resource Relation:
Other Information: PBD: 2002
Subject:
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; HIGH-LEVEL RADIOACTIVE WASTES; RADIOACTIVE WASTE MANAGEMENT; RADIOACTIVE WASTE DISPOSAL; BENTONITE; CONCRETES; GRANITES; PHYSICAL PROPERTIES; MECHANICAL PROPERTIES; SPAIN
OSTI ID:
20255364
Research Organizations:
Empresa Nacional de Residuos Radiactivos (Spain)
Country of Origin:
Spain
Language:
Spanish
Other Identifying Numbers:
TRN: ES02B0215
Availability:
INIS
Submitting Site:
SPN
Size:
172 pages
Announcement Date:

Citation Formats

Leguey Jimenez, S, Cuevas Rodriguez, J, Ramirez Martin, S, Vigil de la villa Mencia, R., and Martin Barca, M. Hydrothermal alkaline stability of bentonite barrier by concrete interstitial wastes; Alteracion alcalina hidrotermal de la barrera de bentonita por aguas intersticiales de cementos. Spain: N. p., 2002. Web.
Leguey Jimenez, S, Cuevas Rodriguez, J, Ramirez Martin, S, Vigil de la villa Mencia, R., & Martin Barca, M. Hydrothermal alkaline stability of bentonite barrier by concrete interstitial wastes; Alteracion alcalina hidrotermal de la barrera de bentonita por aguas intersticiales de cementos. Spain.
Leguey Jimenez, S, Cuevas Rodriguez, J, Ramirez Martin, S, Vigil de la villa Mencia, R., and Martin Barca, M. 2002. "Hydrothermal alkaline stability of bentonite barrier by concrete interstitial wastes; Alteracion alcalina hidrotermal de la barrera de bentonita por aguas intersticiales de cementos." Spain.
@misc{etde_20255364,
title = {Hydrothermal alkaline stability of bentonite barrier by concrete interstitial wastes; Alteracion alcalina hidrotermal de la barrera de bentonita por aguas intersticiales de cementos}
author = {Leguey Jimenez, S, Cuevas Rodriguez, J, Ramirez Martin, S, Vigil de la villa Mencia, R., and Martin Barca, M}
abstractNote = {At present, the main source of High Level radioactive Waste (HLW) is the electrical energy production during all the steps of developing. In almost all the countries with nuclear programs, the option for the final management of HLW is the Deep Geological Repository (DGR) based on the concept of multi barrier. According to this concept, the waste is isolated from biosphere by the interposition of confinement barriers. Two of the engineering barriers in the Spanish design of DGR in granitic rock are compacted bentonite and concrete. The bentonite barrier is the backfilling and sealing material for the repository gallery, because of its mechanical and physico-chemical properties. The main qualities of concrete as a component of a multi barrier system are its low permeability, mechanical resistance and chemical properties. With regard to chemical composition of concrete, the alkaline nature of cement pore water lowers the solubility of many radioactive elements. However, structural transformation in smectite, dissolution or precipitation of minerals and, consequently, changes in the bentonite properties could occurs in the alkaline conditions generated by the cement degradation. The main objective of the present work is to evaluate the effect of concrete in the stability of Spanish reference bentonite (La Serrata of Nijar, Almeria, Spain) in conditions similar to those estimated in a DGR in granitic rock. Because of the main role of bentonite barrier in the global performance of the repository, the present study is essential to guarantee its security. (Author)}
place = {Spain}
year = {2002}
month = {Jul}
}