Two-phase transport in a cemented waste package considering spatio-temporal evolution of chemical conditions

Abstract The long-term evolution of cemented waste packages is governed by (bio)chemical reactions between waste, cement, and barrier materials, and by transport processes inside the waste package and through openings in the waste package hull. Inside a waste package, gases can be generated by pH-de...

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Autores principales:	Yonghui Huang, Haibing Shao, Erich Wieland, Olaf Kolditz, Georg Kosakowski
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492
Acceso en línea:	https://doaj.org/article/0d56b2476ebf44be895155f90f0900e9
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id	oai:doaj.org-article:0d56b2476ebf44be895155f90f0900e9
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spelling	oai:doaj.org-article:0d56b2476ebf44be895155f90f0900e92021-12-02T10:44:20ZTwo-phase transport in a cemented waste package considering spatio-temporal evolution of chemical conditions10.1038/s41529-021-00150-z2397-2106https://doaj.org/article/0d56b2476ebf44be895155f90f0900e92021-02-01T00:00:00Zhttps://doi.org/10.1038/s41529-021-00150-zhttps://doaj.org/toc/2397-2106Abstract The long-term evolution of cemented waste packages is governed by (bio)chemical reactions between waste, cement, and barrier materials, and by transport processes inside the waste package and through openings in the waste package hull. Inside a waste package, gases can be generated by pH-dependent anoxic corrosion of metals and the degradation of organic matter. The (bio)chemical reactions consume water and will not proceed under dry conditions. The degradation of cementitious materials lowers the alkaline pH of the pore water. The modeling of such a complex feedback system shows that the internal structure of a waste package and the exchange of mass with the environment (boundary conditions) are major factors that determine the importance of process couplings. The (bio)chemical reactions are controlled by internal re-distribution of water predominantly via vapor transport. Calculated gas generation rates were found to be affected by dry-out processes inside the drum.Yonghui HuangHaibing ShaoErich WielandOlaf KolditzGeorg KosakowskiNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492ENnpj Materials Degradation, Vol 5, Iss 1, Pp 1-14 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Yonghui Huang Haibing Shao Erich Wieland Olaf Kolditz Georg Kosakowski Two-phase transport in a cemented waste package considering spatio-temporal evolution of chemical conditions
description	Abstract The long-term evolution of cemented waste packages is governed by (bio)chemical reactions between waste, cement, and barrier materials, and by transport processes inside the waste package and through openings in the waste package hull. Inside a waste package, gases can be generated by pH-dependent anoxic corrosion of metals and the degradation of organic matter. The (bio)chemical reactions consume water and will not proceed under dry conditions. The degradation of cementitious materials lowers the alkaline pH of the pore water. The modeling of such a complex feedback system shows that the internal structure of a waste package and the exchange of mass with the environment (boundary conditions) are major factors that determine the importance of process couplings. The (bio)chemical reactions are controlled by internal re-distribution of water predominantly via vapor transport. Calculated gas generation rates were found to be affected by dry-out processes inside the drum.
format	article
author	Yonghui Huang Haibing Shao Erich Wieland Olaf Kolditz Georg Kosakowski
author_facet	Yonghui Huang Haibing Shao Erich Wieland Olaf Kolditz Georg Kosakowski
author_sort	Yonghui Huang
title	Two-phase transport in a cemented waste package considering spatio-temporal evolution of chemical conditions
title_short	Two-phase transport in a cemented waste package considering spatio-temporal evolution of chemical conditions
title_full	Two-phase transport in a cemented waste package considering spatio-temporal evolution of chemical conditions
title_fullStr	Two-phase transport in a cemented waste package considering spatio-temporal evolution of chemical conditions
title_full_unstemmed	Two-phase transport in a cemented waste package considering spatio-temporal evolution of chemical conditions
title_sort	two-phase transport in a cemented waste package considering spatio-temporal evolution of chemical conditions
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/0d56b2476ebf44be895155f90f0900e9
work_keys_str_mv	AT yonghuihuang twophasetransportinacementedwastepackageconsideringspatiotemporalevolutionofchemicalconditions AT haibingshao twophasetransportinacementedwastepackageconsideringspatiotemporalevolutionofchemicalconditions AT erichwieland twophasetransportinacementedwastepackageconsideringspatiotemporalevolutionofchemicalconditions AT olafkolditz twophasetransportinacementedwastepackageconsideringspatiotemporalevolutionofchemicalconditions AT georgkosakowski twophasetransportinacementedwastepackageconsideringspatiotemporalevolutionofchemicalconditions
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Two-phase transport in a cemented waste package considering spatio-temporal evolution of chemical conditions

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