Reactive transport modelling of long-term carbonation

2014 ◽  
Vol 52 ◽  
pp. 42-53 ◽  
Author(s):  
O.P. Kari ◽  
J. Puttonen ◽  
E. Skantz
Keyword(s):  
Reactive Transport ◽  
Reactive Transport Modelling ◽  
Transport Modelling

scholarly journals Evolution of the Reaction and Alteration of Mudstone with Ordinary Portland Cement Leachates: Sequential Flow Experiments and Reactive-Transport Modelling

Minerals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1026
Author(s):  
Keith Bateman ◽  
Shota Murayama ◽  
Yuji Hanamachi ◽  
James Wilson ◽  
Takamasa Seta ◽  
...  
Keyword(s):  
Reactive Transport ◽  
Chemical Properties ◽  
Reactive Transport Modelling ◽  
Transport Modelling ◽  
General Sequence ◽  
Long Term Performance ◽  
Term Performance ◽  
Physical And Chemical ◽  
Flow Experiments

The construction of a repository for geological disposal of radioactive waste will include the use of cement-based materials. Following closure, groundwater will saturate the repository and the extensive use of cement will result in the development of a highly alkaline porewater, pH > 12.5; this fluid will migrate into and react with the host rock. The chemistry of the fluid will evolve over time, initially high [Na] and [K], evolving to a Ca-rich fluid, and finally returning to the groundwater composition. This evolving chemistry will affect the long-term performance of the repository, altering the physical and chemical properties, including radionuclide behaviour. Understanding these changes forms the basis for predicting the long-term evolution of the repository. This study focused on the determination of the nature and extent of the chemical reaction, as well as the formation and persistence of secondary mineral phases within a mudstone, comparing data from sequential flow experiments with the results of reactive transport modelling. The reaction of the mudstone with the cement leachates resulted in small changes in pH with the precipitation of calcium aluminium silicate hydrate (C-(A-)S-H) phases of varying compositions. As the system evolves, secondary C-(A-)S-H phases re-dissolve and are replaced by secondary carbonates. This general sequence was successfully simulated using reactive transport modelling.

Long-term geochemical evolution of the near field repository: Insights from reactive transport modelling and experimental evidences

2008 ◽  
Vol 102 (3-4) ◽  
pp. 196-209 ◽  
Author(s):  
David Arcos ◽  
Fidel Grandia ◽  
Cristina Domènech ◽  
Ana M. Fernández ◽  
María V. Villar ◽  
...  
Keyword(s):  
Reactive Transport ◽  
Near Field ◽  
Geochemical Evolution ◽  
Reactive Transport Modelling ◽  
Transport Modelling
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