Effect of carbonation on alkali-activated slag paste
Effect of carbonation on alkali-activated slag paste
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DOI：
10.1111/j.1551-2916.2006.01214.x
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发表时间：
2006-10-01
影响因子：
3.9
通讯作者：
Puertas, F.
中科院分区：
文献类型：
--
作者：
Palacios, M.;Puertas, F.
分析了水玻璃和NaOH活化矿渣浆体的碳酸化，并与波特兰水泥浆体中的碳酸化进行了比较，以确定可能的差异。采用热重-差热分析（TG/DTA）、傅里叶变换红外光谱和核磁共振等方法研究了对主要反应产物的影响。根据TG/DTA的结果，碳酸盐沉淀后，碳酸盐在波特兰水泥浆体比在碱活化矿渣浆体中更强烈。这可能是由于在波特兰水泥浆体中，硅酸盐和C-S-H凝胶都可以碳酸化，而在碱矿渣浆体中，只有C-S-H凝胶直接碳酸化。在这两个系统中，碳酸化导致形成碳酸钙，富硅C-S-H凝胶，硅胶，和氧化铝。水玻璃活化渣浆的碳酸化作用不因研究中使用的任何一种有机添加剂的存在而改变。
Carbonation on waterglass- and NaOH-activated slag pastes was analyzed and compared with carbonation in Portland cement pastes to determine possible differences. Thermogravimetry-differential thermal analysis (TG/DTA), Fourier-transform infrared spectrometry, and nuclear magnetic resonance were used to determine the effects on the main reaction products. According to the TG/DTA results, carbonate precipitation following carbonation is much more intense in Portland cement pastes than in alkali-activated slag pastes. This may be attributed to the fact that in Portland cement paste both the portlandite and the C-S-H gel can be carbonated, whereas in alkali-activated slag pastes, only the C-S-H gel is carbonated directly. In both systems, carbonation leads to the formation of CaCO3, Si-rich C-S-H gel, silica gel, and alumina. The carbonation of waterglass-activated slag pastes is not altered by the presence of either of the organic additives used in the study.