The present study explores the carbonation behavior of calcium sulfoaluminate (CSA) cement blended with blast-furnace slag (BFS) or fly ash (FA). The hydration phase assemblages of CSA cement blended with BFS or FA were predicted at various carbonation degrees by the Gibbs free energy minimization-based thermodynamic modelling approach. The obtained simulation results provide important information regarding the mineralogical changes that are induced by carbonation. It is expected that monosulfate initially buffers carbonation by transforming into monocarbonate and reducing the pore volume, while the destabilization of monocarbonate is likely to dramatically reduce the pH in the pore solution in both neat CSA and blended systems. Formation of more C-A-S-H and zeolite is expected during the carbonation of blended systems, moreover, FA-blended systems can have amorphous silica that increasingly forms at higher FA contents upon carbonation.

本研究探讨了将硫铝酸钙（CSA）水泥与高炉矿渣（BFS）或粉煤灰（FA）混合的碳化行为。通过基于吉布斯自由能最小化的热力学建模方法，预测了在不同碳酸化程度下掺入BFS或FA的CSA水泥的水化相组合。获得的模拟结果提供了有关碳化引起的矿物学变化的重要信息。可以预料，一硫酸盐最初会通过转化为一碳酸盐并减少孔体积来缓冲碳酸化，而一碳酸酯的失稳可能会显着降低纯CSA和共混体系中孔溶液的pH。此外，在共混体系碳化期间，预计还会形成更多的CASH和沸石。