Reactive Transport Modeling of CO2 through Cementitious Materials under CO2 Geological Storage Conditions
SHEN ; DANGLA ; THIERY
Type de document
ARTICLE A COMITE DE LECTURE REPERTORIE DANS BDI (ACL)
Langue
anglais
Auteur
SHEN ; DANGLA ; THIERY
Résumé / Abstract
A reactive transport model is proposed to simulate the reactivity of cement in contact with CO2-saturated brine and supercritical CO2 (scCO2). Dissolution and precipitation reactions for portlandite (CH) and calcite (View the MathML source) are described by mass action laws and threshold of ion activity products in order to account for complete dissolved minerals. A generalization of the mass action law is derived from thermodynamics and applied to calcium silicate hydrates (C-S-H) to take into account the continuous variation (decrease) of the C/S ratio during the dissolution reaction of C-S-H. We assume thermodynamical equilibrium for chemical processes. The porosity changes induced by the precipitation and dissolution reactions are also taken into account. Ion transport is described by using the Nernst-Planck equation as well as advection. Couplings between transport equations and chemical reactions are treated thanks to several mass balance equations written for each atom. We simulate by a finite volume method some experiments reported in the literature and compare our numerical results to these experimental observations.
Source
International Journal of Greenhouse and Gas Control, num. , pp. 75-87 p.
Editeur
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