Geochemical model of the granite–bentonite–groundwater interaction at Äspö HRL (LOT experiment)

Arcos, David; Bruno, Jordi; Karnland, Ola

doi:10.1016/s0169-1317(03)00106-6

Cited by 23 publications

(8 citation statements)

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“…Various in situ experiments have been conducted to demonstrate the technical feasibility of HLW disposal and study the physical phenomena and the chemical reactions taking place at the bentonite barrier. They include: the LOT experiment at the Äspö underground research laboratory (URL) in Sweden (Karnland et al, 2000;Arcos et al, 2003), the Ophelie mock-up test performed at the HADES URL in Belgium (Verstricht et al, 2007), and the FEBEX (Full-scale Engineered Barrier EXperiment) project (ENRESA, 2000(ENRESA, , 2006a. FEBEX is a demonstration and research project dealing with the engineered barrier system (EBS) designed for sealing and containment of waste in a radioactive waste repository (ENRESA, 2000).…”

Section: Introductionmentioning

confidence: 99%

“…Geochemical models for the bentonite are useful tools to interpret experimental results and perform long term predictions. Examples of such models include the bentonite geochemical model of Arcos et al (2003) for the LOT experiment, the models tested within the DECOVALEX Project (Tsang et al, 2009), and the coupled thermal, hydrodynamic and chemical (THC) models of the FEBEX bentonite (ENRESA, 2000;2006c;Samper et al, 2008a,b;Zheng et al, 2010). The FEBEX in situ experiment started in February 1997.…”

Section: Introductionmentioning

confidence: 99%

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A coupled THC model of the FEBEX in situ test with bentonite swelling and chemical and thermal osmosis

Zheng

Samper

Montenegro

2011

Journal of Contaminant Hydrology

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The performance assessment of a geological repository for radioactive waste requires quantifying the geochemical evolution of the bentonite engineered barrier. This barrier will be exposed to coupled thermal (T), hydrodynamic (H), mechanical (M) and chemical (C) processes. This paper presents a coupled THC model of the FEBEX (Full-scale Engineered Barrier EXperiment) in situ test which accounts for bentonite swelling and chemical and thermal osmosis. Model results attest the relevance of thermal osmosis and bentonite swelling for the geochemical evolution of the bentonite barrier while chemical osmosis is found to be almost irrelevant. The model has been tested with data collected after the dismantling of heater 1 of the in situ test. The model reproduces reasonably well the measured temperature, relative humidity, water content and inferred geochemical data. However, it fails to mimic the solute concentrations at the heater-bentonite and bentonite-granite interfaces because the model does not account for the volume change of bentonite, the CO 2 (g) degassing and the transport of vapor from the bentonite into the granite. The inferred HCO 3 -and pH data cannot be explained solely by solute Page 2 of 54 transport, calcite dissolution and protonation/deprotonation by surface complexation, suggesting that such data may be affected also by other reactions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A coupled THC model of the FEBEX in situ test with bentonite swelling and chemical and thermal osmosis

Zheng

Samper

Montenegro

2011

Journal of Contaminant Hydrology

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“…In HLW disposal concepts, the bentonite buffer surrounding waste packages will evolve with time due to progressive reaction with saturating ambient groundwater, including ion exchange, dissolutionprecipitation of accessory (gypsum, halite quartz, calcite) and clay minerals potentially affecting properties such as the hydraulic conductivity and the swelling pressure. RTM studies regarding these aspects have evolved from simple exchange models to more complex 1-and 2-D problem setup, including the effect of advection in a fracture intersecting the disposal cell (e.g., Arcos et al 2003Arcos et al , 2008Sena et al 2010;Benbow et al 2019).…”

Section: Modeling Materials and Reactive Interfacesmentioning

confidence: 99%

RTM for Waste Repositories

Bildstein

Claret

Frugier

2019

Reviews in Mineralogy and Geochemistry

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“…Geochemical modelling of porewater in clays is an active field of work where several approaches are taken to understand and quantify processes controlling porewater chemistry and its evolution in response to changes in environmental conditions Beaucaire et al, 2000;Baeyens, 1998, 2003;Muurinen and Lehikoinen, 1999;Arcos et al, 2003;Fernández et al, 2004;Pearson et al, 2003;Wersin, 2003;Metz et al, 2003;Ochs et al, 2004;Wersin et al, 2004;Samper et al, 2005;Gaucher et al, 2006;Turrero et al, 2006;Sasamoto et al, 2007). Geochemical evolution of clay porewater chemistry is controlled by cation exchange, proton surface complexation and dissolution/precipitation of soluble accessory minerals, and depends on ambient temperature and pressure as well as on solid-to-liquid ratio, S/L Fernández et al, 2004;Bradbury and Baeyens, 2003;Wersin, 2003;Wersin et al, 2004).…”

Section: Introductionmentioning

confidence: 99%