Mechanism of thermal activation on granular coal gangue and its impact on the performance of cement mortars

偏高岭土 煅烧 材料科学 火山灰 水泥 硅酸盐水泥 火山灰活动 胶凝的 抗压强度 微观结构 灰浆 高岭石 冶金 复合材料 矿物学 化学工程 化学 有机化学 催化作用 工程类
作者
Aiguo Wang,Peng Liu,H. J. Mo,Kaiwei Liu,Rui Ma,Yanmei Guan,Daosheng Sun
出处
期刊:Journal of building engineering [Elsevier BV]
卷期号:45: 103616-103616 被引量:60
标识
DOI:10.1016/j.jobe.2021.103616
摘要

Coal gangue (CG) is a kind of solid waste discharged from the process of coal mining and washing without efficient utilization. Motivated by using the CG as supplementary cementitious materials (SCMs) for the partial substitution of cement, the CG was thermally activated via calcining under high temperature and the corresponding mechanism was discussed. The effect of calcination on the microstructure and pozzolanic reactivity of CG as well as the corresponding influence on the performance of Portland cement mortars were investigated via using TG/DSC, SEM, XRD and NMR. Results showed that, CG mainly consist of kaolinite and quartz. Under 550 °C, the kaolinite in CG was transformed into metakaolin, and the metakaolin was further transformed into mullite when the calcination temperature was elevated to 950 °C. Thermally activated CG had a high pozzolanic reactivity, which improved the mechanical properties of cement mortars. Compared with the mortars mixed with un-calcined CG, the 28d flexural and compressive strengths of mortars mixed with 30 wt% CG calcined at 750 °C were increased by 16.1% and 46.4%, respectively. This is attributed to the increased relative contents of Q3 (29Si NMR) and Al[5]+Al[4] (27Al NMR). The higher the relative contents of [SiO4] with Q3(-100.26 ppm) structure and Al[5]+Al[4], the higher the reactivity of calcined CG. This study develops a potential approach to recycle CG and develop greener cement materials.
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