Glass/Water Reaction with and without Bentonite Present - Experiment and Model

Grambow, Bernd; Hermansson, H. P.; Björner, Inga-Kari; Werme, Lars

doi:10.1557/proc-50-187

Cited by 12 publications

(14 citation statements)

References 4 publications

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“…The effect of bentonite on glass performance was modeled by Grambow et al [141]. Bentonite can have either favorable or unfavorable effects on glass dissolution rates.…”

Section: Interactions With Other Repository Materialsmentioning

confidence: 99%

Critical review of glass performance modeling

Bourcier

1994

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“…The effect of bentonite on glass performance was modeled by Grambow et al [141]. Bentonite can have either favorable or unfavorable effects on glass dissolution rates.…”

Section: Interactions With Other Repository Materialsmentioning

confidence: 99%

Critical review of glass performance modeling

Bourcier

1994

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“…A constant temperature of 55°C was used in (2). The log K values that Wanner calculated, and from which the log K values in Table I were determined, are based on experiments performed at 25°C.…”

Section: Numerical Simulationsmentioning

confidence: 99%

“…Of particular importance are the chemical properties of bentonite since they will affect the composition of the groundwater in contact with the waste canister and determine the bentonite's ability to retard the migration of radionuclides. Experimental studies of the chemical properties of bentonite generally fall into two categories: studies of the influence of sodium bentonite on groundwater composition (e.g., [1,2]) and diffusion of radionuclides through compacted bentonite (e.g., [3,4,5]). Experiments in the first category are generally batch experiments in which the bentonite is mixed with a reference groundwater in a clay /water ratio smaller than that of compacted bentonite.…”

Section: Introductionmentioning

confidence: 99%

“…Reactions between the bentonite and water proceed, therefore, at a faster rate than they would in compacted bentonite. The effect of the clay /water ratio on the increase of sodium in the solution is noted in [2]. Experimental studies of diffusion of radionuclides through compacted bentonite vary considerably in design and in how the bentonite is prepared before being placed in the experiment cell.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of Alteration of Sodium Bentonite by Diffusion of Ionic Groundwater Components

Jacobsen

Carnahan

1987

MRS Proc.

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Because of its ability to retard the movement of radionuclides, sodium bentonite is being considered as a packing and backfilling material in a number of nuclear waste isolation programs. Few studies, however, have considered how the chemical properties of the bentonite backfill will vary with distance from the canister and change in time as groundwater constituents diffuse through the bentonite. Of particular importance is the conversion of sodium bentonite to calcium bentonite by ion exchange, which will in turn affect the migration of cationic radionuclides, such as Cs+ and Sr2+, leaking from a waste canister.Experiments measuring the movement of trace amounts of radionuclides through compacted bentonite have typically used unaltered bentonite. Models based on experiments such as these may not lead to accurate predictions of the migration through altered or partially altered bentonite of radionuclides that undergo ion exchange. To address this problem, we have modified an existing transport code to include ion exchange and aqueous complexation reactions. The code is thus able to simulate the diffusion of major ionic groundwater components through bentonite and reactions between the bentonite and groundwater. Numerical simulations have been made to investigate the conversion of sodium bentonite to calcium bentonite for a reference groundwater characteristic of deep granitic formations.

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“…The model developed by Grambow [10] has been applied to natural basalt glasses from the deep ocean [11], to the alteration of basalt glass in seawater [12], and to nuclear waste glass in contact with bentonite clay [13].…”

Section: Introductionmentioning

confidence: 99%

Modeling The Dissolution Behavior of Defense Waste Glass in A Salt Repository Environment

McGrail

1987

MRS Proc.

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A mechanistic model describing a dynamic mass balance between the production and consumption of dissolved silica was found to describe the dissolution behavior of SRL-165 defense waste glass in a high-magnesium brine (PBB3) at a temperature of 90*C.The synergistic effect of the waste package container on the glass dissolution rate was found to depend on a precipitation reaction for a ferrous silicate mineral.The model predicted that the ferrous silicate precipitate should be variable in composition where the iron/silica stoichiometry depended on the metal/glass surface area ratio used in the experiment.This prediction was confirmed experimentally by the variable iron/silica ratios observed in filtered leachates.However, the interaction between dissolved silica and iron corrosion products needs to be much better understood before the model can be used with confidence in predicting radionuclide release rates for a salt repository.

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Glass/Water Reaction with and without Bentonite Present - Experiment and Model

Cited by 12 publications

References 4 publications

Critical review of glass performance modeling

Critical review of glass performance modeling

Numerical Simulation of Alteration of Sodium Bentonite by Diffusion of Ionic Groundwater Components

Modeling The Dissolution Behavior of Defense Waste Glass in A Salt Repository Environment

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