Baltakys K, Dambrauskas T, Rubinaite D, Siauciunas R, Grineviciene A
Department of Silicate Technology, Kaunas University of Technology, Radvilenu 19, 50254, Kaunas, Lithuania.
Sci Rep. 2021 Jul 20;11(1):14742. doi: 10.1038/s41598-021-94148-x.
In this work, the optimal conditions of the synthesis of eco-friendly cement by using industrial wastes as well as the peculiarities of its early stage hydration were investigated. The eco-friendly cement was synthesized within the 1000-1250 °C temperature range when the targeted composition was 60% of belite, 20% of ye'elimite, and 20% of brownmillerite. It was determined that the optimal sintering temperature for eco-friendly cement is 1100 °C because the primary compounds were fully reacted, and hydraulic active compounds were dominant in the products. Microcalorimetry analysis was performed for the investigation of early stage hydration. The best results of hydration were obtained with the eco-friendly cement which was produced by using mixtures with silica gel waste: three exothermic reactions were observed in the heat evolution curve, while the cumulative heat was equal to 264 J/g after 72 h. Additionally, the sequence of compounds formation during the first day of hydration was analyzed. It was determined that the composition of the initial mixture impacts the hydration rate of synthetic eco-friendly cement; however, it did not affect the mineralogical composition of the hydration products. These results were confirmed by XRD, STA, and SEM analysis.
在这项工作中，研究了利用工业废弃物合成生态友好型水泥的最佳条件及其早期水化特性。当目标组成为60%的贝利特、20%的铁铝酸四钙和20%的钙铁榴石时，在1000 - 1250℃的温度范围内合成了生态友好型水泥。确定生态友好型水泥的最佳烧结温度为1100℃，因为初级化合物完全反应，且产物中具有水硬性的活性化合物占主导地位。采用微量热法分析早期水化过程。使用含有硅胶废料的混合物生产的生态友好型水泥获得了最佳的水化效果：在热释放曲线中观察到三个放热反应，72小时后累积热量等于264 J/g。此外，还分析了水化第一天化合物的形成顺序。确定初始混合物的组成会影响合成生态友好型水泥的水化速率；然而，它不会影响水化产物的矿物组成。这些结果通过XRD、STA和SEM分析得到了证实。
