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The paper deals with the assessment of CO 2  storage capacity in cement concrete using reactive transport modelling of the accelerated carbonation, i.e. 15 Vol % and experiments. To meet the most realistic geometry of concrete aggregates, the numerical solution is achieved using a homogeneous concrete without aggregates and two-phase concrete including aggregates. We utilise the reactive transport model to estimate molar concentration of cement components and porosity distribution during CO 2  carbonation. The model also computes the hydration process before and during carbonation. The numerical solutions are obtained from an extremely nonlinear transient system of Partial Differential Equations (PDEs). The experiments of CO 2  carbonation have been carried out using coarse concrete aggregates after 6 months of curing in water. Based on Thermal Gravimetric Analysis (TGA), CO 2  uptake during carbonation is determined in weight percent. The numerical simulations fairly agree with the experiments.HighlightsCO 2  sequestration calculation via chemical reactionsSingle-Phase &amp; 2-phase numerical concrete aggregateAccelerated carbonation modelling &amp; experiments. CO 2  sequestration calculation via chemical reactions Single-Phase &amp; 2-phase numerical concrete aggregate Accelerated carbonation modelling &amp; experiments.

On CO 2 sequestration in concrete aggregate via carbonation: simulation and experimental verification