Hydration of Eurobitum bituminized waste under free swelling conditions: osmosis-induced swelling and NaNO3 leaching

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Hydration of Eurobitum bituminized waste under free swelling conditions: osmosis-induced swelling and NaNO3 leaching. / Bleyen, Nele; Smets, Steven; Verwimp, Wim; Hendrix, Katrien; Sillen, Xavier; Valcke, Elie.

Scientific Basis for Nuclear Waste Management XXXIX . Vol. 1/62 61. ed. MRS - Materials Research Society, 2016. p. 4103-4108.

Research output: Contribution to report/book/conference proceedingsIn-proceedings paperpeer-review

Harvard

Bleyen, N, Smets, S, Verwimp, W, Hendrix, K, Sillen, X & Valcke, E 2016, Hydration of Eurobitum bituminized waste under free swelling conditions: osmosis-induced swelling and NaNO3 leaching. in Scientific Basis for Nuclear Waste Management XXXIX . 61 edn, vol. 1/62, MRS - Materials Research Society, pp. 4103-4108, MRS 2015. The Scienfic Basis for Nuclear Waste mangement symposium, Montpellier, France, 2015-11-02. https://doi.org/10.1557/adv.2017.196

APA

Bleyen, N., Smets, S., Verwimp, W., Hendrix, K., Sillen, X., & Valcke, E. (2016). Hydration of Eurobitum bituminized waste under free swelling conditions: osmosis-induced swelling and NaNO3 leaching. In Scientific Basis for Nuclear Waste Management XXXIX (61 ed., Vol. 1/62, pp. 4103-4108). MRS - Materials Research Society. https://doi.org/10.1557/adv.2017.196

Vancouver

Bleyen N, Smets S, Verwimp W, Hendrix K, Sillen X, Valcke E. Hydration of Eurobitum bituminized waste under free swelling conditions: osmosis-induced swelling and NaNO3 leaching. In Scientific Basis for Nuclear Waste Management XXXIX . 61 ed. Vol. 1/62. MRS - Materials Research Society. 2016. p. 4103-4108 https://doi.org/10.1557/adv.2017.196

Author

Bleyen, Nele ; Smets, Steven ; Verwimp, Wim ; Hendrix, Katrien ; Sillen, Xavier ; Valcke, Elie. / Hydration of Eurobitum bituminized waste under free swelling conditions: osmosis-induced swelling and NaNO3 leaching. Scientific Basis for Nuclear Waste Management XXXIX . Vol. 1/62 61. ed. MRS - Materials Research Society, 2016. pp. 4103-4108

Bibtex - Download

@inproceedings{41772500f44a4ed08dff52c249a3c89d,
title = "Hydration of Eurobitum bituminized waste under free swelling conditions: osmosis-induced swelling and NaNO3 leaching",
abstract = "In Belgium, Eurobitum bituminized radioactive waste is an important intermediate-level long-lived waste form that contains, besides bitumen and radionuclides, large amounts of soluble salts (mainly NaNO3). Geological disposal in a water-saturated sedimentary formation will induce swelling of Eurobitum due to water uptake by the hygroscopic salts embedded in a highly efficient semi-permeable bitumen membrane. Initially, while there is still free space in the primary waste containers, free swelling will occur. To improve our understanding of the water uptake processes under free swelling conditions, water uptake and leaching tests are being performed in which inactive Eurobitum was contacted at the top with 0.1 M KOH (simplified representation of young cement water) without effective stress on the sample. Under these test conditions, the evolution of the water uptake and NaNO3 leaching processes shows several stages: (1) initial fast ingress of water into and leaching of NaNO3 from pores close to the surface; (2) slower progression of the hydration front, the swelling and the leaching of NaNO3, but behaving linearly with the square root of time, indicating that these processes are controlled by diffusion; (3) after more than 2 to 3 years, the leaching, hydration and swelling rates reincrease, attributed to the formation of interconnecting pores and (micro)cracks in the bitumen matrix in response to its increasing deformation.",
keywords = "Eurobitum, ILW, water uptake, osmosis, NaNO3 leaching",
author = "Nele Bleyen and Steven Smets and Wim Verwimp and Katrien Hendrix and Xavier Sillen and Elie Valcke",
note = "Score=3; MRS 2015. The Scienfic Basis for Nuclear Waste mangement symposium ; Conference date: 02-11-2015 Through 06-11-2015",
year = "2016",
month = dec,
day = "1",
doi = "10.1557/adv.2017.196",
language = "English",
volume = "1/62",
pages = "4103--4108",
booktitle = "Scientific Basis for Nuclear Waste Management XXXIX",
publisher = "MRS - Materials Research Society",
edition = "61",

}

RIS - Download

TY - GEN

T1 - Hydration of Eurobitum bituminized waste under free swelling conditions: osmosis-induced swelling and NaNO3 leaching

AU - Bleyen, Nele

AU - Smets, Steven

AU - Verwimp, Wim

AU - Hendrix, Katrien

AU - Sillen, Xavier

AU - Valcke, Elie

N1 - Score=3

PY - 2016/12/1

Y1 - 2016/12/1

N2 - In Belgium, Eurobitum bituminized radioactive waste is an important intermediate-level long-lived waste form that contains, besides bitumen and radionuclides, large amounts of soluble salts (mainly NaNO3). Geological disposal in a water-saturated sedimentary formation will induce swelling of Eurobitum due to water uptake by the hygroscopic salts embedded in a highly efficient semi-permeable bitumen membrane. Initially, while there is still free space in the primary waste containers, free swelling will occur. To improve our understanding of the water uptake processes under free swelling conditions, water uptake and leaching tests are being performed in which inactive Eurobitum was contacted at the top with 0.1 M KOH (simplified representation of young cement water) without effective stress on the sample. Under these test conditions, the evolution of the water uptake and NaNO3 leaching processes shows several stages: (1) initial fast ingress of water into and leaching of NaNO3 from pores close to the surface; (2) slower progression of the hydration front, the swelling and the leaching of NaNO3, but behaving linearly with the square root of time, indicating that these processes are controlled by diffusion; (3) after more than 2 to 3 years, the leaching, hydration and swelling rates reincrease, attributed to the formation of interconnecting pores and (micro)cracks in the bitumen matrix in response to its increasing deformation.

AB - In Belgium, Eurobitum bituminized radioactive waste is an important intermediate-level long-lived waste form that contains, besides bitumen and radionuclides, large amounts of soluble salts (mainly NaNO3). Geological disposal in a water-saturated sedimentary formation will induce swelling of Eurobitum due to water uptake by the hygroscopic salts embedded in a highly efficient semi-permeable bitumen membrane. Initially, while there is still free space in the primary waste containers, free swelling will occur. To improve our understanding of the water uptake processes under free swelling conditions, water uptake and leaching tests are being performed in which inactive Eurobitum was contacted at the top with 0.1 M KOH (simplified representation of young cement water) without effective stress on the sample. Under these test conditions, the evolution of the water uptake and NaNO3 leaching processes shows several stages: (1) initial fast ingress of water into and leaching of NaNO3 from pores close to the surface; (2) slower progression of the hydration front, the swelling and the leaching of NaNO3, but behaving linearly with the square root of time, indicating that these processes are controlled by diffusion; (3) after more than 2 to 3 years, the leaching, hydration and swelling rates reincrease, attributed to the formation of interconnecting pores and (micro)cracks in the bitumen matrix in response to its increasing deformation.

KW - Eurobitum

KW - ILW

KW - water uptake

KW - osmosis

KW - NaNO3 leaching

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/23018623

U2 - 10.1557/adv.2017.196

DO - 10.1557/adv.2017.196

M3 - In-proceedings paper

VL - 1/62

SP - 4103

EP - 4108

BT - Scientific Basis for Nuclear Waste Management XXXIX

PB - MRS - Materials Research Society

T2 - MRS 2015. The Scienfic Basis for Nuclear Waste mangement symposium

Y2 - 2 November 2015 through 6 November 2015

ER -

ID: 2352715