煅烧明矾对硬石膏水化硬化性能的影响  

Influence of calcined alum on the hydration and hardening performance of anhydrite

作　　者：张建新[1] 董军[1] 彭家惠[1] 白冷[1] 万体智[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400030

出　　处：《重庆大学学报（自然科学版）》2009年第2期163-167,共5页Journal of Chongqing University

基　　金：国家自然科学基金资助项目(50572126)

摘　　要：通过对硬石膏凝结时间、水化率与水化温升测定,硬化体显微结构与强度关系的分析,研究了煅烧明矾对硬石膏水化进程及硬化体结构、强度和液相过饱和度等性能的影响,分析了煅烧明矾改善硬石膏水化活性的机理。结果表明:煅烧明矾是硬石膏的高效激发剂,能使硬石膏的凝结时间缩短,水化进程加快;使二水石膏晶体细化,硬化体强度提高;能改善硬石膏的水化溶解性能,使液相SO42-浓度和二水石膏析晶过饱和度提高,促进了二水石膏的自发均相成核和晶体生长。The influence of calcined alum on the hydration process, the structure and intensity of hardened anhydrite, the degree of solution supersaturation, and other properties are investigated by determining setting time, hydration rate and hydration temperature increases in combination with analyzing the microstructure and intensity of hardened paste. The alum action mechanism also is revealed. The results indicate that calcined alum is a highly active excitant for anhydrite. Calcined alum can reduce setting time, increase the hydration process and intensity of anhydrite, and refine crystals. Calcined alum improves the hydration and solution performance of anhydrite and sulfate radical concentration. This subsequently raises the degree of dihydrate gypsum supersaturation. Anhydrite hydration and solution, and the spontaneous homogeneous nucleation and growth of dihydrate gypsum crystals are all accelerated.

关 键 词：硬石膏 煅烧明矾 水化 溶解 过饱和度 

分 类 号：TQ177.374[化学工程—硅酸盐工业]