Publication: Modificaciones microestructurales mineralógicas y geoquímicas en bentonitas sometidas a cambios térmicos e hidráulicos
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2020-04-17
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Universidad Complutense de Madrid
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Abstract
El almacenamiento geológico profundo es una de las soluciones más estudiadas ante el problema que suponen la generación y acumulación de residuos radiactivos de alta actividad. Dentro del concepto global de almacenamiento geológico profundo, uno de los campos de estudio se enfoca en el empleo de un material natural que actuaría como barrera de seguridad de los residuos almacenados y que es conocido como bentonita. Para verificar la validez de este material se requiere del estudio de su comportamiento a largo plazo en las condiciones impuestas en la situación de un almacenamiento de este tipo. En este trabajo se realiza una evaluación del comportamiento termo-hidro-mecánico y geoquímico de dos bentonitas (MX-80 y FEBEX), con el fin contribuir a la valoración para su empleo en el contexto mencionado. Para ello se realizaron una serie de ensayos analizando distintos aspectos. Por un lado, se llevaron a cabo ensayos termo-hidráulicos en laboratorio con una duración entre 500 y más de 2.700 días, en los cuales las condiciones de temperatura y humedad aplicadas eran próximas a las que afectarían a la bentonita en una situación de almacenamiento real...
Deep geological disposal is one of the most studied solutions to the problem involving the generation and accumulation of high level radioactive waste. Within the global concept of deep geological disposal, one of the fields of study focuses on the use of a natural material that would act as a safety barrier for stored waste and is known as bentonite. To verify the validity of this material, it is necessary to study its long-term behavior in the conditions imposed in the situation of storage. In this work an evaluation of the thermo-hydro-mechanical and geochemical behavior of two bentonites (MX-80 and FEBEX) is carried out, in order to contribute to the assessment for its use in this context. To this end, several tests were carried out analyzing different aspects. On the one hand, thermo-hydraulic laboratory tests were carried out with a duration between 500 and more than 2,700 days, in which the temperature and humidity applied were close to those that would affect the bentonite in a real storage situation...
Deep geological disposal is one of the most studied solutions to the problem involving the generation and accumulation of high level radioactive waste. Within the global concept of deep geological disposal, one of the fields of study focuses on the use of a natural material that would act as a safety barrier for stored waste and is known as bentonite. To verify the validity of this material, it is necessary to study its long-term behavior in the conditions imposed in the situation of storage. In this work an evaluation of the thermo-hydro-mechanical and geochemical behavior of two bentonites (MX-80 and FEBEX) is carried out, in order to contribute to the assessment for its use in this context. To this end, several tests were carried out analyzing different aspects. On the one hand, thermo-hydraulic laboratory tests were carried out with a duration between 500 and more than 2,700 days, in which the temperature and humidity applied were close to those that would affect the bentonite in a real storage situation...
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Tesis inédita de la Universidad Complutense de Madrid, Facultad de Ciencias Geológicas, Departamento de Mineralogía y Petrología, leída el 13/01/2020. Tesis formato europeo (compendio de artículos)