Grimsel test site - Long-term cement studies.Reactive transport modeling of experiment 2 at Grimsel

Within the framework of the GTS-LCS project (Grimsel Test Site – Long-Term Cement Studies), an in-situ experiment lasting about 5 years was started in 2009 to study water-cement-rock interactions in fractured granite. A solid cement source (OPC) was installed in a borehole intersecting a water condu...

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Autores: Saaltink, Maarten Willem|||0000-0003-0553-4573, Soler Matamala, Josep M.
Tipo de recurso: informe técnico
Fecha de publicación:2016
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/87772
Acceso en línea:https://hdl.handle.net/2117/87772
Access Level:acceso abierto
Palabra clave:Radioactive waste disposal in the ground
Grimsel
portlandite
granite
fracture
reactive transport modeling
Residus radioactius -- Emplaçament
Àrees temàtiques de la UPC::Enginyeria civil::Geologia::Hidrologia subterrània
Àrees temàtiques de la UPC::Desenvolupament humà i sostenible::Enginyeria ambiental::Tractament dels residus
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network_name_str España
repository_id_str
spelling Grimsel test site - Long-term cement studies.Reactive transport modeling of experiment 2 at GrimselSaaltink, Maarten Willem|||0000-0003-0553-4573Soler Matamala, Josep M.Radioactive waste disposal in the groundGrimselportlanditegranitefracturereactive transport modelingResidus radioactius -- EmplaçamentÀrees temàtiques de la UPC::Enginyeria civil::Geologia::Hidrologia subterràniaÀrees temàtiques de la UPC::Desenvolupament humà i sostenible::Enginyeria ambiental::Tractament dels residusWithin the framework of the GTS-LCS project (Grimsel Test Site – Long-Term Cement Studies), an in-situ experiment lasting about 5 years was started in 2009 to study water-cement-rock interactions in fractured granite. A solid cement source (OPC) was installed in a borehole intersecting a water conducting fracture. Two other boreholes at about 0.56 m (observation) and 1.12 m (extraction) from the emplacement borehole were used to monitor the evolution of water composition in the fracture. Prior to the experiment, a tracer test was performed to characterize the initial flow and transport properties of the rock around the experimental boreholes. The flow and reactive transport calculations have been performed using the Retraso-CodeBright code. Solute transport is assumed to be controlled by diffusion in the cement and by advection-dispersion in the rock fracture. Initially, the flow model calculated from the results of the pre-emplacement tracer test, assuming a homogeneous fracture, was used to model reactive transport after emplacement of the cement. Since the small grid size from the flow model led to excessive computational times, the domain was divided into (a) a 1D radial model for the emplacement borehole and a small volume of rock around it, and (b) a 2D model for the rest of the domain. The results from (a) were used as input for (b). The model results show dissolution of portlandite and C-S-H in a thin (mm) external layer of the cement (emplacement borehole). In the rock fracture there is dissolution of the primary silicates (except phlogopite) and precipitation of C-S-H, C-A-S-H and calcite. Fracture porosity is reduced in a belt around the 3 boreholes, converging at the extraction borehole (due to the magnitude of the extraction flow rate). The decrease in porosity, due mainly to the precipitation of calcite, is stronger right next to the extraction borehole, due to the more favorable mixing conditions between Grimsel groundwater and cement porewater. The changing water injection rate conditions in the emplacement borehole lead to changes in the flow field and in the position of the mineral reaction fronts.20162016-04-0120162016-06-07reporthttp://purl.org/coar/resource_type/c_93fcAOhttp://purl.org/coar/version/c_b1a7d7d4d402bcceinfo:eu-repo/semantics/reportapplication/pdfhttps://hdl.handle.net/2117/87772reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/877722026-05-27T15:37:01Z
dc.title.none.fl_str_mv Grimsel test site - Long-term cement studies.Reactive transport modeling of experiment 2 at Grimsel
title Grimsel test site - Long-term cement studies.Reactive transport modeling of experiment 2 at Grimsel
spellingShingle Grimsel test site - Long-term cement studies.Reactive transport modeling of experiment 2 at Grimsel
Saaltink, Maarten Willem|||0000-0003-0553-4573
Radioactive waste disposal in the ground
Grimsel
portlandite
granite
fracture
reactive transport modeling
Residus radioactius -- Emplaçament
Àrees temàtiques de la UPC::Enginyeria civil::Geologia::Hidrologia subterrània
Àrees temàtiques de la UPC::Desenvolupament humà i sostenible::Enginyeria ambiental::Tractament dels residus
title_short Grimsel test site - Long-term cement studies.Reactive transport modeling of experiment 2 at Grimsel
title_full Grimsel test site - Long-term cement studies.Reactive transport modeling of experiment 2 at Grimsel
title_fullStr Grimsel test site - Long-term cement studies.Reactive transport modeling of experiment 2 at Grimsel
title_full_unstemmed Grimsel test site - Long-term cement studies.Reactive transport modeling of experiment 2 at Grimsel
title_sort Grimsel test site - Long-term cement studies.Reactive transport modeling of experiment 2 at Grimsel
dc.creator.none.fl_str_mv Saaltink, Maarten Willem|||0000-0003-0553-4573
Soler Matamala, Josep M.
author Saaltink, Maarten Willem|||0000-0003-0553-4573
author_facet Saaltink, Maarten Willem|||0000-0003-0553-4573
Soler Matamala, Josep M.
author_role author
author2 Soler Matamala, Josep M.
author2_role author
dc.subject.none.fl_str_mv Radioactive waste disposal in the ground
Grimsel
portlandite
granite
fracture
reactive transport modeling
Residus radioactius -- Emplaçament
Àrees temàtiques de la UPC::Enginyeria civil::Geologia::Hidrologia subterrània
Àrees temàtiques de la UPC::Desenvolupament humà i sostenible::Enginyeria ambiental::Tractament dels residus
topic Radioactive waste disposal in the ground
Grimsel
portlandite
granite
fracture
reactive transport modeling
Residus radioactius -- Emplaçament
Àrees temàtiques de la UPC::Enginyeria civil::Geologia::Hidrologia subterrània
Àrees temàtiques de la UPC::Desenvolupament humà i sostenible::Enginyeria ambiental::Tractament dels residus
description Within the framework of the GTS-LCS project (Grimsel Test Site – Long-Term Cement Studies), an in-situ experiment lasting about 5 years was started in 2009 to study water-cement-rock interactions in fractured granite. A solid cement source (OPC) was installed in a borehole intersecting a water conducting fracture. Two other boreholes at about 0.56 m (observation) and 1.12 m (extraction) from the emplacement borehole were used to monitor the evolution of water composition in the fracture. Prior to the experiment, a tracer test was performed to characterize the initial flow and transport properties of the rock around the experimental boreholes. The flow and reactive transport calculations have been performed using the Retraso-CodeBright code. Solute transport is assumed to be controlled by diffusion in the cement and by advection-dispersion in the rock fracture. Initially, the flow model calculated from the results of the pre-emplacement tracer test, assuming a homogeneous fracture, was used to model reactive transport after emplacement of the cement. Since the small grid size from the flow model led to excessive computational times, the domain was divided into (a) a 1D radial model for the emplacement borehole and a small volume of rock around it, and (b) a 2D model for the rest of the domain. The results from (a) were used as input for (b). The model results show dissolution of portlandite and C-S-H in a thin (mm) external layer of the cement (emplacement borehole). In the rock fracture there is dissolution of the primary silicates (except phlogopite) and precipitation of C-S-H, C-A-S-H and calcite. Fracture porosity is reduced in a belt around the 3 boreholes, converging at the extraction borehole (due to the magnitude of the extraction flow rate). The decrease in porosity, due mainly to the precipitation of calcite, is stronger right next to the extraction borehole, due to the more favorable mixing conditions between Grimsel groundwater and cement porewater. The changing water injection rate conditions in the emplacement borehole lead to changes in the flow field and in the position of the mineral reaction fronts.
publishDate 2016
dc.date.none.fl_str_mv 2016
2016-04-01
2016
2016-06-07
dc.type.none.fl_str_mv report
http://purl.org/coar/resource_type/c_93fc
AO
http://purl.org/coar/version/c_b1a7d7d4d402bcce
dc.type.openaire.fl_str_mv info:eu-repo/semantics/report
format report
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/87772
url https://hdl.handle.net/2117/87772
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300724

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