Diffusive Transport of Dissolved Gases in Potential Concretes for Nuclear Waste Disposal

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Diffusive Transport of Dissolved Gases in Potential Concretes for Nuclear Waste Disposal. / Jacops, Elke; Phung, Quoc Tri; Frederickx, Lander; Levasseur, Séverine.

In: Sustainability, Vol. 13, No. 18, 13181007, 07.09.2021, p. 1-15.

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@article{bd1f19d43e154f87af51a28902e72ec3,
title = "Diffusive Transport of Dissolved Gases in Potential Concretes for Nuclear Waste Disposal",
abstract = "In many countries, the preferred option for the long-term management of high- and intermediate level radioactive waste and spent fuel is final disposal in a geological repository. In this geological repository, the generation of gas will be unavoidable. In order to make a correct balance between gas generation and dissipation by diffusion, knowledge of the diffusion coefficients of gases in the host rock and the engineered barriers is essential. Currently, diffusion coefficients for the Boom Clay, a potential Belgian host rock, are available, but the diffusion coefficients for gases in the engineered concrete barriers are still lacking. Therefore, diffusion experiments with dissolved gases were performed on two concrete-based barrier materials considered in the current Belgian disposal concept, by using the double through-diffusion technique for dissolved gases, which was developed in 2008 by SCK CEN. Diffusion measurements were performed with four gases including helium, neon, methane and ethane. Information on the microstructure of the materials (e.g., pore size distribution) was obtained by combining N2-adsorption, mercury intrusion porosimetry (MIP), scanning electron microscopy (SEM) and water sorptivity measurements. A comparison was made with data obtained from cement-based samples (intact and degraded), and the validity of existing predictive models was investigated.",
keywords = "Gas diffusion, Concrete, Engineered barrier, Microstructure, Nuclear disposal",
author = "Elke Jacops and Phung, {Quoc Tri} and Lander Frederickx and S{\'e}verine Levasseur",
note = "Score=10",
year = "2021",
month = "9",
day = "7",
doi = "10.3390/su131810007",
language = "English",
volume = "13",
pages = "1--15",
journal = "Sustainability",
issn = "2071-1050",
publisher = "MDPI",
number = "18",

}

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TY - JOUR

T1 - Diffusive Transport of Dissolved Gases in Potential Concretes for Nuclear Waste Disposal

AU - Jacops, Elke

AU - Phung, Quoc Tri

AU - Frederickx, Lander

AU - Levasseur, Séverine

N1 - Score=10

PY - 2021/9/7

Y1 - 2021/9/7

N2 - In many countries, the preferred option for the long-term management of high- and intermediate level radioactive waste and spent fuel is final disposal in a geological repository. In this geological repository, the generation of gas will be unavoidable. In order to make a correct balance between gas generation and dissipation by diffusion, knowledge of the diffusion coefficients of gases in the host rock and the engineered barriers is essential. Currently, diffusion coefficients for the Boom Clay, a potential Belgian host rock, are available, but the diffusion coefficients for gases in the engineered concrete barriers are still lacking. Therefore, diffusion experiments with dissolved gases were performed on two concrete-based barrier materials considered in the current Belgian disposal concept, by using the double through-diffusion technique for dissolved gases, which was developed in 2008 by SCK CEN. Diffusion measurements were performed with four gases including helium, neon, methane and ethane. Information on the microstructure of the materials (e.g., pore size distribution) was obtained by combining N2-adsorption, mercury intrusion porosimetry (MIP), scanning electron microscopy (SEM) and water sorptivity measurements. A comparison was made with data obtained from cement-based samples (intact and degraded), and the validity of existing predictive models was investigated.

AB - In many countries, the preferred option for the long-term management of high- and intermediate level radioactive waste and spent fuel is final disposal in a geological repository. In this geological repository, the generation of gas will be unavoidable. In order to make a correct balance between gas generation and dissipation by diffusion, knowledge of the diffusion coefficients of gases in the host rock and the engineered barriers is essential. Currently, diffusion coefficients for the Boom Clay, a potential Belgian host rock, are available, but the diffusion coefficients for gases in the engineered concrete barriers are still lacking. Therefore, diffusion experiments with dissolved gases were performed on two concrete-based barrier materials considered in the current Belgian disposal concept, by using the double through-diffusion technique for dissolved gases, which was developed in 2008 by SCK CEN. Diffusion measurements were performed with four gases including helium, neon, methane and ethane. Information on the microstructure of the materials (e.g., pore size distribution) was obtained by combining N2-adsorption, mercury intrusion porosimetry (MIP), scanning electron microscopy (SEM) and water sorptivity measurements. A comparison was made with data obtained from cement-based samples (intact and degraded), and the validity of existing predictive models was investigated.

KW - Gas diffusion

KW - Concrete

KW - Engineered barrier

KW - Microstructure

KW - Nuclear disposal

UR - https://ecm.sckcen.be/OTCS/llisapi.dll/open/45309719

U2 - 10.3390/su131810007

DO - 10.3390/su131810007

M3 - Article

VL - 13

SP - 1

EP - 15

JO - Sustainability

JF - Sustainability

SN - 2071-1050

IS - 18

M1 - 13181007

ER -

ID: 7189477