Yang Zhouxiang, Tao Xu, Wang Guoling, Li Weifeng
College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211816, China.
Materials (Basel). 2022 Apr 28;15(9):3196. doi: 10.3390/ma15093196.
In order to realize low energy consumption in cement and the recycling of solid waste, the phase composition and structure of waste mortar used to prepare a high belite cement clinker, instead of some other raw materials, have here been investigated, and the belite was activated by doping with SO. The results show that a good high belite cement clinker can be obtained using waste mortar, limestone, coal gangue, iron powder, or iron correction raw materials combined at 1350 °C for half an hour. The addition of SO greatly increased the strength of the clinker in the early phase, and overall, the ratio of calcium to silicon in belite became higher, and more AlO entered the belite; however, the generation of CS was inhibited somewhat, and the content of CAF also increased. This study offers guidance for the application of waste mortar and the activation of belite, which offers huge environmental and economic benefits.
为了实现水泥的低能耗以及固体废物的回收利用，本文研究了用于制备高贝利特水泥熟料的废砂浆而非其他一些原料的相组成和结构，并通过掺杂SO对贝利特进行活化。结果表明，使用废砂浆、石灰石、煤矸石、铁粉或铁校正原料在1350℃下煅烧半小时，可以得到性能良好的高贝利特水泥熟料。SO的添加大大提高了熟料的早期强度，总体而言，贝利特中钙硅比变得更高，更多的Al2O3进入贝利特；然而，C3S的生成受到一定抑制，C4AF的含量也有所增加。本研究为废砂浆的应用和贝利特的活化提供了指导，具有巨大的环境和经济效益。
