Abstract

The paper deals with the assessment of CO₂ 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 CO₂ 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 CO₂ carbonation have been carried out using coarse concrete aggregates after 6 months of curing in water. Based on Thermal Gravimetric Analysis (TGA), CO₂ uptake during carbonation is determined in weight percent. The numerical simulations fairly agree with the experiments.

• Highlights

• CO₂ sequestration calculation via chemical reactions

• Single-Phase & 2-phase numerical concrete aggregate

• Accelerated carbonation modelling & experiments.

摘要

本文涉及使用加速碳化反应传输模型（即 15 Vol%）和实验评估水泥混凝土中的 CO _{2储存能力。}为了满足混凝土骨料的最现实几何形状，数值解是使用不含骨料的均质混凝土和包括骨料的两相混凝土来实现的。我们利用反应输运模型来估计 CO ₂碳化过程中水泥组分的摩尔浓度和孔隙度分布。该模型还计算了碳酸化之前和期间的水合过程。数值解是从偏微分方程 (PDE) 的极端非线性瞬态系统中获得的。CO _2的实验在水中固化 6 个月后，使用粗混凝土骨料进行碳化。基于热重分析 (TGA)，碳酸化过程中的 CO ₂吸收以重量百分比确定。数值模拟与实验相当吻合。

• 强调

• 通过化学反应计算CO _2封存

• 单相和两相数值混凝土骨料

• 加速碳酸化建模和实验。