Investigation on the Activity Activation and Cementitious Property of Coal Gangue with High Iron and Silica Contents

2017 4th International Conference on Advanced Materials, Mechanics and Structural Engineering

材料科学;机械制造

Wu, Hong^1 ; Li, Yu^1 ; Teng, Min^1 ; Yang, Yu^1

School of Chemical and Materials Engineering, Liupanshui Normal University, Liupanshui, Guizhou

553004, China^1

关键词: Alkaline environment;    Cementitious properties;    Crystal composition;    Degree of crystallinity;    Framework structures;    Large specific surface areas;    Metastable structures;    Thermal activation;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/269/1/012019/pdf
DOI  :  10.1088/1757-899X/269/1/012019

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The activity of coal gangue by thermal activation and composite activation technologies was investigated. The crystal composition, framework structure and morphology change were analyzed by XRD, FT-IR and SEM, respectively. The cementitious property of coal gangue was measured by strength test. The results showed that thermal activation decomposed kaolinite in coal gangue, and formed the metastable structure with a porous state, multiple internal broken bonds and large specific surface areas. Based on thermal activation, the added lime provided the alkaline environment, then this reduced the bond energy of reactant particles and the degree of crystallinity of quartz in coal gangue. The two activation methods could effectively improve the cementitious property of coal gangue based unburned bricks, and that the composite activation technology was superior performance.