Abstract The long-term durability and their mechanisms of alkali-activated cement based materials have remained largely elusive. In this paper, carbonation of alkali-activated slag (AAS) mortars activated by NaOH and waterglass with different alkali dosages and silicate moduli has been investigated after exposure to 3 ± 0.2% (v/v) CO2 at 20 ± 2 °C/65 ± 5% RH for 56 days. The results show that carbonation resistance of the AAS mortars increases with increase of not only alkali dosage but also silicate modulus. In addition to the higher pore solution alkalinity and slag reaction extent, the relatively higher carbonation resistance of the AAS mortars is attributed to the lower porosity and average pore size. The loss of compressive strength for the waterglass activated slag mortars after carbonation is due to decalcification of C-A-S-H phase, whereas the carbonation of katoite contributes to the increase of compressive strength of the NaOH activated slag mortars.

中文翻译：

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碱用量和硅酸盐模量对碱活化矿渣砂浆碳化的影响

摘要 碱活化水泥基材料的长期耐久性及其机理在很大程度上仍然难以捉摸。在本文中，研究了在 20 ± 2 °C/65 下暴露于 3 ± 0.2% (v/v) CO2 后，由 NaOH 和不同碱剂量和硅酸盐模量的水玻璃活化的碱活化矿渣 (AAS) 砂浆的碳化± 5% RH 56 天。结果表明，随着碱用量和硅酸盐模量的增加，AAS砂浆的抗碳化性能增加。除了较高的孔隙溶液碱度和炉渣反应程度外，AAS 砂浆相对较高的抗碳化性归因于较低的孔隙率和平均孔径。碳化后水玻璃活性矿渣砂浆抗压强度的损失是由于CASH相脱钙，