Wang Qingping, Zhu Longtao, Lu Chunyang, Liu Yuxin, Yu Qingbo, Chen Shuai
School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China.
State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan 232001, China.
Polymers (Basel). 2023 Feb 28;15(5):1241. doi: 10.3390/polym15051241.
In this paper, the influence of calcium on coal gangue and fly ash geopolymer is explored, and the problem of low utilization of unburned coal gangue is analyzed and solved. The experiment took uncalcined coal gangue and fly ash as raw materials, and a regression model was developed with the response surface methodology. The independent variables were the CG content, alkali activator concentration, and Ca(OH) to NaOH ratio (CH/SH). The response target value was the coal gangue and fly-ash geopolymer compressive strength. The compressive strength tests and the regression model obtained by the response surface methodology showed that the coal gangue and fly ash geopolymer prepared with the content of uncalcined coal gangue is 30%, alkali activator content of 15%, and the value of CH/SH is 1.727 had a dense structure and better performance. The microscopic results demonstrated that the uncalcined coal gangue structure is destroyed under an alkali activator's action, and a dense microstructure is formed based on C(N)-A-S-H and C-S-H gel, which provides a reasonable basis for the preparation of geopolymers from the uncalcined coal gangue.
本文探讨了钙对煤矸石和粉煤灰地质聚合物的影响，并分析和解决了未燃尽煤矸石利用率低的问题。实验以未煅烧煤矸石和粉煤灰为原料，采用响应面法建立了回归模型。自变量为煤矸石含量、碱激发剂浓度以及Ca(OH)₂与NaOH的比例（CH/SH）。响应目标值为煤矸石和粉煤灰地质聚合物的抗压强度。抗压强度试验以及通过响应面法得到的回归模型表明，未煅烧煤矸石含量为30%、碱激发剂含量为15%且CH/SH值为1.727时制备的煤矸石和粉煤灰地质聚合物结构致密且性能更佳。微观结果表明，未煅烧煤矸石结构在碱激发剂作用下被破坏，并基于C(N)-A-S-H和C-S-H凝胶形成了致密的微观结构，这为利用未煅烧煤矸石制备地质聚合物提供了合理依据。
