论文部分内容阅读
采用固体29Si核磁共振、FTIR、XRD测试方法研究了养护温度、温度变化对大掺量粉煤灰水泥基材料水化C-S-H凝胶硅氧四面体聚合程度的影响规律。结果表明:粉煤灰掺量为50%时,C-S-H凝胶硅氧四面体的聚合程度和C-S-H凝胶中铝氧四面体的比例随着养护温度的升高而呈现先增加后稳定的趋势。在7d至28d龄期阶段,常温养护更加有利于C-S-H凝胶硅氧四面体聚合程度的增加,也更有利于Al原子取代Si原子。
The influences of curing temperature and temperature on the polymerization degree of silica-alumina tetrahedron of high-volume fly ash cement-based materials were studied by solid 29Si NMR, FTIR and XRD. The results show that the degree of polymerization of silica tetrahedron and the proportion of aluminum oxy tetrahedra in C-S-H gel increase first and then stabilize with the increase of curing temperature when the content of fly ash is 50%. During the 7d to 28d stage, room temperature curing is more conducive to the increase of silicon-tetrahedral tetrahedral polymerization degree of C-S-H gel, and is more favorable for substitution of Si atoms by Al atoms.