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利用物理改性、化学改性、物理与化学共同改性对氟石膏进行改性处理,考察其不同改性方式对氟石膏性能的影响。物理改性方法采用粉磨方式,研究了不同粉磨时间对氟石膏粒度和标准稠度用水量的影响;化学改性选取β型半水石膏、硫酸钠、明矾作为氟石膏的化学激发剂,分别研究其对氟石膏凝结时间、强度等的影响;选择物理和化学单独改性取得的最佳参数进行同时改性;为了达到砌筑水泥的性能要求,选择加入少量水泥并确定其最佳掺量。研究结果表明,化学改性和物理改性均能改善氟石膏的水化活性,但物理与化学同时改性效果更好;氟石膏砌筑材料的最佳配方为:5%水泥,95%改性氟石膏(其中2%β型半水石膏、1%硫酸钠、1%明矾、4%熟石灰、92%氟石膏和粉磨时间为20 min);氟石膏砌筑材料各项性能指标符合《砌筑水泥》(GB/T 3183-2003)要求。
Fluorogypsum was modified by physical modification, chemical modification, physical and chemical co-modification, and the effects of different modification methods on the properties of fluorogypsum were investigated. The method of physical modification adopts the grinding method to study the effect of different grinding time on the particle size and the standard consistency of fluorine gypsum. Chemical modification selects β type hemihydrate gypsum, sodium sulfate and alum as chemical stimulants of fluorogypsum , Respectively, to study the coagulation time and strength of fluorogypsum, etc .; choose the best physical and chemical modification of the parameters obtained simultaneously modified; in order to meet the performance requirements of masonry cement, choose to add a small amount of cement and determine its best Volume. The results show that both chemical modification and physical modification can improve the hydration activity of fluorogypsum, but the effect of physical and chemical modification is better at the same time. The optimum formula of fluorogold masonry is 5% cement, 95% modification (Including 2% β-type hemihydrate gypsum, 1% sodium sulfate, 1% alum, 4% hydrated lime, 92% fluorogypsum and grinding time of 20 min); gypsum masonry material performance in line with the “ Masonry cement ”(GB / T 3183-2003) requirements.