This article features an investigation of the accelerated carbonation products of four calcium silicate phases, namely monoclinic-tricalcium silicate (3CaO·SiO₂ or C₃S), γ-dicalcium silicate (2CaO·SiO₂ or γ-C₂S), tricalcium disilicate (3CaO·2SiO₂ or C₃S₂, rankinite), and monocalcium silicate (CaO·SiO₂ or CS, wollastonite). During the carbonation reaction, the calcium silicate minerals form calcium carbonate and Ca-modified silica gel. These reaction products were examined using thermogravimetric analysis (TGA), X-ray powder diffraction (XRD), ²⁹Si magic angle spining (MAS) nuclear magnetic resonance (NMR), ¹³C {¹H} cross polarized (CP)/MAS NMR, and dynamic vapor sorption (DVS) techniques. Along with the crystalline forms of CaCO₃ (i.e., calcite, vaterite, and aragonite), amorphous calcium carbonate (ACC) was also found to be present in the carbonated calcium silicate systems. Based on the experimental results, it is proposed that the ACC particles were stabilized by the deposition of silica layers on their surfaces. Presence of ACC also affected the pore size distribution of the matrixes, which eventually influenced the diffusion based carbonation rate of the matrixes. Moreover, the degree of carbonation of CS was found to be most effective compared to other calcium silicates in terms of the percentage of the phase reacted for the experimental conditions used in this study.

本文设有四个硅酸钙阶段，即单斜硅酸三钙的加速碳化产品的调查（3CaO·的SiO ₂或C ₃ S），γ-硅酸二钙（2CaO·的SiO ₂或γ-C ₂ S），磷酸三钙硅酸二钙（3CaO·2SiO ₂或C ₃ S ₂，变质钙石）和硅酸钙（CaO·SiO ₂或CS，硅灰石）。在碳酸化反应过程中，硅酸钙矿物形成碳酸钙和钙改性硅胶。这些反应产物使用热重分析（TGA），X射线粉末衍射（XRD），²⁹Si幻角自旋（MAS）核磁共振（NMR），¹³ C { ¹ H}交叉极化（CP）/ MAS NMR和动态气相吸附（DVS）技术。与结晶形式的CaCO _3一起（即方解石，球ate石和文石），无定形碳酸钙（ACC）也存在于碳酸硅酸钙体系中。根据实验结果，提出通过在其表面上沉积二氧化硅层来稳定ACC颗粒。ACC的存在也影响了基体的孔径分布，最终影响了基体的基于扩散的碳酸化率。此外，就本研究中使用的实验条件而言，发现与其他硅酸钙相比，CS的碳酸化程度最有效。