Understanding the effect of formed calcium carbonate and highly polymerization of silicates on the microstructure of cement paste exposed to early CO₂ curing and further hydration process is crucial to comprehend the mechanisms of CO₂ curing. In this paper, the cement pastes were further cured in water after CO₂ curing under two CO₂ concentrations (3% and 20%) and the carbonation depth, compressive strength, composition and morphology of the formed products were characterized. The results showed that calcite was the main product generated in CO₂-cured pastes and its content was increased with the increasing CO₂ concentration. The formed calcium carbonate provided additional nucleation sites and accelerated the hydration of C₃S in further water curing. Furthermore, calcium carbonate was consumed by C₃A to form calcium aluminate monocarbonate, which delayed the transformation of ettringite to monosulfate during further water curing. The decarbonation temperature of the formed calcium carbonate was increased with the increase of the CO₂ concentration, but it was decreased in further water curing due to participating the further hydration process. The early carbonation curing improved the polymerization of silica gel, which was decreased in the subsequent hydration due to the formation of C-S-H. The CO₂-cured sample showed higher early compressive strength and comparable long-term compressive strength compared to the conventional samples due to the lower porosity.

了解形成的碳酸钙和硅酸盐的高度聚合对暴露于早期 CO ₂固化和进一步水化过程的水泥浆体微观结构的影响对于理解 CO ₂固化机制至关重要。在本文中，水泥浆体在CO ₂固化后在两种CO ₂浓度（3%和20%）下进一步在水中固化，并对成型制品的碳化深度、抗压强度、成分和形貌进行了表征。结果表明，方解石是CO ₂固化糊状物产生的主要产物，其含量随着CO _{2 的}增加而增加。专注。形成的碳酸钙提供了额外的成核位点，并在进一步的水固化中加速了 C ₃ S的水合。此外，C ₃ A消耗碳酸钙形成铝酸单碳酸钙，这延迟了钙矾石在进一步水固化过程中向单硫酸盐的转化。生成的碳酸钙脱碳温度随着CO ₂浓度的增加而升高，但在进一步的水固化过程中由于参与了进一步的水化过程而降低。早期碳酸化固化改善了硅胶的聚合，由于CSH的形成，在随后的水化中降低了硅胶的聚合度。二氧化碳₂- 由于孔隙率较低，固化样品与传统样品相比显示出更高的早期抗压强度和相当的长期抗压强度。