Research output: Contribution to report/book/conference proceedings › In-proceedings paper

**A Consistent Approach for the Development of a Comprehensive Data Base of Time-dependent Parameters for Concrete Engineered Barriers.** / Seetharam, Suresh; Mallants, Dirk; Perko, Janez; Jacques, Diederik; Weetjens, Eef (Peer reviewer).

Research output: Contribution to report/book/conference proceedings › In-proceedings paper

Seetharam, S, Mallants, D, Perko, J, Jacques, D & Weetjens, E 2013, A Consistent Approach for the Development of a Comprehensive Data Base of Time-dependent Parameters for Concrete Engineered Barriers. in *Proceedings of the 15th International Conference on Environmental Remediation and Radioactive Waste Management - ICEM2013 (on CD).* United States, pp. 1-8, ICEM 2013 - 15th International Conference On Environmental Remediation And Radioactive Waste Management, Brussels, Belgium, 2013-09-08.

Seetharam, S., Mallants, D., Perko, J., Jacques, D., & Weetjens, E. (2013). A Consistent Approach for the Development of a Comprehensive Data Base of Time-dependent Parameters for Concrete Engineered Barriers. In *Proceedings of the 15th International Conference on Environmental Remediation and Radioactive Waste Management - ICEM2013 (on CD) *(pp. 1-8). United States.

Seetharam S, Mallants D, Perko J, Jacques D, Weetjens E. A Consistent Approach for the Development of a Comprehensive Data Base of Time-dependent Parameters for Concrete Engineered Barriers. In Proceedings of the 15th International Conference on Environmental Remediation and Radioactive Waste Management - ICEM2013 (on CD). United States. 2013. p. 1-8

@inproceedings{cf34abacf5064850b6b519c4d5934a48,

title = "A Consistent Approach for the Development of a Comprehensive Data Base of Time-dependent Parameters for Concrete Engineered Barriers",

abstract = "This paper presents a consistent approach for the development of a comprehensive data base of time-dependent hydraulic and transport parameters for concrete engineered barriers of the future Dessel near surface repository for low level waste. The parameter derivation is based on integration of selected data obtained through an extensive literature review, data from experimental studies on cementitious materials specific for the Dessel repository and numerical modelling using physically-based models of water and mass transport. Best estimate parameter values for assessment calculations are derived, together with source and expert range and their probability density function wherever the data was sufficient. We further discuss a numerical method for upscaling laboratory derived parameter values to the repository scale; the resulting large-scale effective parameters are commensurate with numerical grids used in models for radionuclide migration. To accommodate different levels of conservatism in the various assessment calculations defined by ONDRAF/NIRAS, several sets of parameter values have been derived based on assumptions that introduce different degrees of conservatism. For pertinent parameters, the time evolution of such properties due to the long-term concrete degradation is also addressed. The implementation of the consistent approach is demonstrated by considering the pore water diffusion coefficient as an example.",

keywords = "concrete, physical, chemical and transport properties, performance assessment, nuclear waste",

author = "Suresh Seetharam and Dirk Mallants and Janez Perko and Diederik Jacques and Eef Weetjens",

note = "Score = 3",

year = "2013",

month = "9",

language = "English",

pages = "1--8",

booktitle = "Proceedings of the 15th International Conference on Environmental Remediation and Radioactive Waste Management - ICEM2013 (on CD)",

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AU - Seetharam, Suresh

AU - Mallants, Dirk

AU - Perko, Janez

AU - Jacques, Diederik

A2 - Weetjens, Eef

N1 - Score = 3

PY - 2013/9

Y1 - 2013/9

N2 - This paper presents a consistent approach for the development of a comprehensive data base of time-dependent hydraulic and transport parameters for concrete engineered barriers of the future Dessel near surface repository for low level waste. The parameter derivation is based on integration of selected data obtained through an extensive literature review, data from experimental studies on cementitious materials specific for the Dessel repository and numerical modelling using physically-based models of water and mass transport. Best estimate parameter values for assessment calculations are derived, together with source and expert range and their probability density function wherever the data was sufficient. We further discuss a numerical method for upscaling laboratory derived parameter values to the repository scale; the resulting large-scale effective parameters are commensurate with numerical grids used in models for radionuclide migration. To accommodate different levels of conservatism in the various assessment calculations defined by ONDRAF/NIRAS, several sets of parameter values have been derived based on assumptions that introduce different degrees of conservatism. For pertinent parameters, the time evolution of such properties due to the long-term concrete degradation is also addressed. The implementation of the consistent approach is demonstrated by considering the pore water diffusion coefficient as an example.

AB - This paper presents a consistent approach for the development of a comprehensive data base of time-dependent hydraulic and transport parameters for concrete engineered barriers of the future Dessel near surface repository for low level waste. The parameter derivation is based on integration of selected data obtained through an extensive literature review, data from experimental studies on cementitious materials specific for the Dessel repository and numerical modelling using physically-based models of water and mass transport. Best estimate parameter values for assessment calculations are derived, together with source and expert range and their probability density function wherever the data was sufficient. We further discuss a numerical method for upscaling laboratory derived parameter values to the repository scale; the resulting large-scale effective parameters are commensurate with numerical grids used in models for radionuclide migration. To accommodate different levels of conservatism in the various assessment calculations defined by ONDRAF/NIRAS, several sets of parameter values have been derived based on assumptions that introduce different degrees of conservatism. For pertinent parameters, the time evolution of such properties due to the long-term concrete degradation is also addressed. The implementation of the consistent approach is demonstrated by considering the pore water diffusion coefficient as an example.

KW - concrete

KW - physical

KW - chemical and transport properties

KW - performance assessment

KW - nuclear waste

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_131095

UR - http://knowledgecentre.sckcen.be/so2/bibref/10541

M3 - In-proceedings paper

SP - 1

EP - 8

BT - Proceedings of the 15th International Conference on Environmental Remediation and Radioactive Waste Management - ICEM2013 (on CD)

CY - United States

ER -

ID: 364900