Lot A2 test, THC modelling of the bentonite buffer

Itälä, Aku; Olin, Markus; Lehikoinen, Jarmo

doi:10.1016/j.pce.2011.10.020

Cited by 5 publications

(2 citation statements)

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“…The TOUGH series codes are widely used models originally developed by the groups of the Lawrence Berkley National Laboratory (LBNL) (Finsterle et al, 2014). These models were developed based on coupling thermal-hydrological-chemical (THC) mechanisms with different equation-of state (EOS) modules in porous media (Kiryukhin, et al, 2004;Itälä, et al, 2011;Aradóttir, et al, 2012). By integrating a flexible numerical discretization algorithm in TOUGH series models, Zhang et al (2004) used the TOUGH2 model and conducted a numerical study to assess the flow focusing behavior in 2D unsaturated fractured rock systems.…”

Section: Introductionmentioning

confidence: 99%

Fracture-based modeling of complex flow and CO2 migration in three-dimensional fractured rocks

Lee

2015

Computers & Geosciences

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Section: Introductionmentioning

confidence: 99%

Fracture-based modeling of complex flow and CO2 migration in three-dimensional fractured rocks

Lee

2015

Computers & Geosciences

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“…For that purpose, multi-purpose codes such as PHREEQC (Parkhurst & Appelo, 1999), PHAST (Parkhurst et al, 2000), TOUGHREACT (Xu & Pruess, 2001) and QPAC (Quintessa, 2010) have been used (Gaucher et al, 2004;Luna et al, 2006;Itälä et al, 2011;Savage et al, 2010). In order to meet more specific purposes, various codes such as PRECIP (Noy, 1998), HYTEC (van der Lee et al, 2003), RAIDEN 3 (Watson et al, 2004), CRUNCH (Maher et al, 2006), ALLIANCE (Montarnal et al, 2007), MCD (Appelo & Wersin, 2007) and MC-BENT (Yamaguchi et al, 2007) have also been developed and used.…”

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Development of a reactive transport code MC-CEMENT ver. 2 and its verification using 15-year in situ concrete/clay interactions at the Tournemire URL

Yamaguchi¹,

Kataoka²,

Sawaguchi³

et al. 2013

Clay miner.

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Highly alkaline environments induced by cement-based materials are likely to cause the physical and/or chemical properties of the bentonite buffer materials in radioactive waste repositories to deteriorate. Assessing long-term alteration of concrete/clay systems requires physicochemical models and a number of input parameters. In order to provide reliability in the assessment of the long-term performance of bentonite buffers under disposal conditions, it is necessary to develop and verify reactive transport codes for concrete/clay systems. In this study, a PHREEQC-based, reactive transport analysis code (MC-CEMENT ver. 2) was developed and was verified by comparing results of the calculations with in situ observations of the mineralogical evolution at the concrete/argillite interface. The calculation reproduced the observations such as the mineralogical changes in the argillite limited to within 1 cm in thickness from the interface, formation of CaCO3 and CSH, dissolution of quartz, decrease of porosity in the argillite and an increase in the concrete. These agreements indicate a possibility that models based on lab-scale (∼1 year) experiments can be applied to longer time scales although confidence in the models is necessary for much longer timescales. The fact that the calculations did not reproduce the dissolution of clays and the formation of gypsum indicates that there is still room for improvement in our model.

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Reactive transport modelling of groundwater-bentonite interaction: Effects on exchangeable cations in an alternative buffer material in-situ test

Wallis

Idiart

Dohrmann

et al. 2016

Applied Geochemistry

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Lot A2 test, THC modelling of the bentonite buffer

Cited by 5 publications

References 8 publications

Fracture-based modeling of complex flow and CO2 migration in three-dimensional fractured rocks

Fracture-based modeling of complex flow and CO2 migration in three-dimensional fractured rocks

Development of a reactive transport code MC-CEMENT ver. 2 and its verification using 15-year in situ concrete/clay interactions at the Tournemire URL

Reactive transport modelling of groundwater-bentonite interaction: Effects on exchangeable cations in an alternative buffer material in-situ test

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