用活化煤矸石制备新型胶凝材料

采用脱硫石膏和分析纯CaO作为活性激发剂，通过3种方式活化北京房山煤矸石，并检测、分析用不同方式活化的煤矸石制成的胶凝材料的强度，进而研究了活性激发剂和混磨方式对试验材料热蚀变活化的影响。运用X射线衍射分析表征了煤矸石活化前后的微观特性；运用胶砂试块强度分析和扫描电镜（SEM）分析表征了煤矸石质胶凝材料的胶凝活性。结果表明：该煤矸石的主要活性来源是粘土类矿物，700 ℃煅烧时煤矸石中的高岭石和绿泥石脱水、分解，生成无定形SiO₂和Al₂O₃，与CaO发生固相反应，湿混工艺下固相反应完全，生成C₁₂A₇和C₂S两种水硬性活性物质，活化物料具有较高的胶凝活性。

Preparation of New Cementitious Material with Activated Coal Gangue

Taking the desulfurized gypsum and the analytical reagent CaO as activator, Beijing Fangshan coal gangues are activated by three ways, and then the strength of cementitious materials with the activated coal gangue in different ways are detected and analyzed to study the effect of activator and mixed grinding on the thermal alteration and activation of test materials.The microscopic properties before and after the activation of coal gangue are characterized by the X-ray diffraction; the cementitious activity of cementitious materials with coal gangues are characterized by the mortar strength analysis and scanning electron microscopy (SEM).The results showed that the main activity of coal gangue sources from the clay minerals.And the kaolinite and chlorite in coal gangue are dehydrated and broken down at 700 ℃ calcined to generate the amorphous SiO₂ and Al₂O₃ which occurs the solid state reaction with CaO.In wet mixing process, the reaction is finished, and then two hydraulic active substances C₁₂A₇ and C₂S are generated, both of which own a high cementitious activity.