A cement degradation model for evaluating the evolution of retardation factors in radionuclide leaching models

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A cement degradation model for evaluating the evolution of retardation factors in radionuclide leaching models. / Jacques, Diederik; Perko, Janez; Seetharam, Suresh; Mallants, Dirk.

In: Applied Geochemistry, Vol. 49, No. 10, 10.2014, p. 143-158.

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@article{8de12818d1114584aa3be67b48f5bf13,
title = "A cement degradation model for evaluating the evolution of retardation factors in radionuclide leaching models",
abstract = "Cement-based disposal systems for radioactive will undergo chemical alterations due to interaction with the environment. One of the most relevant geochemical alteration processes is decalcification or leaching of the cement phases. Consequently, the cementitious components will evolve through different chemical degradation states, altering physical and chemical parameters. This paper presents an approach in which geochemical modelling serves as a basis for assessing the evolution of geochemical conditions within a cement-based near-surface disposal facility. Geochemical modelling is used to quantify uncertainties related to C–S–H leaching. On the other hand, the concept of mixed tank reactor is used to represent cement degradation within the entire disposal system and linked it with the retardation factor. The usefulness of the approach is demonstrated via a number of case studies concerning leaching of radionuclides from a cementitious disposal facility. The studies reveal that there is a large effect of the conceptualisation on calculated fluxes from the disposal facility. A crucial factor is the amount of radionuclide mass present in the disposal system when large changes in the retardation factor occur, for instance, when different retardation factors exist in different chemical degradation states.",
keywords = "Surface disposal, cement degradation, leaching, radionuclide transport, impact assessment",
author = "Diederik Jacques and Janez Perko and Suresh Seetharam and Dirk Mallants",
note = "Score = 10",
year = "2014",
month = oct,
doi = "10.1016/j.apgeochem.2014.06.008",
language = "English",
volume = "49",
pages = "143--158",
journal = "Applied Geochemistry",
issn = "0883-2927",
publisher = "Elsevier",
number = "10",

}

RIS - Download

TY - JOUR

T1 - A cement degradation model for evaluating the evolution of retardation factors in radionuclide leaching models

AU - Jacques, Diederik

AU - Perko, Janez

AU - Seetharam, Suresh

AU - Mallants, Dirk

N1 - Score = 10

PY - 2014/10

Y1 - 2014/10

N2 - Cement-based disposal systems for radioactive will undergo chemical alterations due to interaction with the environment. One of the most relevant geochemical alteration processes is decalcification or leaching of the cement phases. Consequently, the cementitious components will evolve through different chemical degradation states, altering physical and chemical parameters. This paper presents an approach in which geochemical modelling serves as a basis for assessing the evolution of geochemical conditions within a cement-based near-surface disposal facility. Geochemical modelling is used to quantify uncertainties related to C–S–H leaching. On the other hand, the concept of mixed tank reactor is used to represent cement degradation within the entire disposal system and linked it with the retardation factor. The usefulness of the approach is demonstrated via a number of case studies concerning leaching of radionuclides from a cementitious disposal facility. The studies reveal that there is a large effect of the conceptualisation on calculated fluxes from the disposal facility. A crucial factor is the amount of radionuclide mass present in the disposal system when large changes in the retardation factor occur, for instance, when different retardation factors exist in different chemical degradation states.

AB - Cement-based disposal systems for radioactive will undergo chemical alterations due to interaction with the environment. One of the most relevant geochemical alteration processes is decalcification or leaching of the cement phases. Consequently, the cementitious components will evolve through different chemical degradation states, altering physical and chemical parameters. This paper presents an approach in which geochemical modelling serves as a basis for assessing the evolution of geochemical conditions within a cement-based near-surface disposal facility. Geochemical modelling is used to quantify uncertainties related to C–S–H leaching. On the other hand, the concept of mixed tank reactor is used to represent cement degradation within the entire disposal system and linked it with the retardation factor. The usefulness of the approach is demonstrated via a number of case studies concerning leaching of radionuclides from a cementitious disposal facility. The studies reveal that there is a large effect of the conceptualisation on calculated fluxes from the disposal facility. A crucial factor is the amount of radionuclide mass present in the disposal system when large changes in the retardation factor occur, for instance, when different retardation factors exist in different chemical degradation states.

KW - Surface disposal

KW - cement degradation

KW - leaching

KW - radionuclide transport

KW - impact assessment

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_138202

UR - http://knowledgecentre.sckcen.be/so2/bibref/12211

U2 - 10.1016/j.apgeochem.2014.06.008

DO - 10.1016/j.apgeochem.2014.06.008

M3 - Article

VL - 49

SP - 143

EP - 158

JO - Applied Geochemistry

JF - Applied Geochemistry

SN - 0883-2927

IS - 10

ER -

ID: 208059