摘要
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。
This paper demonstrated the effects of different modifying methods such as chemical modification, physical modification, and the combined physical and chemical modification on properties of fluorgypsum. For Physical modification method the influence of grinding time on fluorgypsum powder particle size and the dosage of water was studied. For chemical modification, the r-semi-hydrated gypsum, sodium sulfate and calcined alum are used as fluor- gypsum chemical activator to study the influence of fluorgysum setting time and strength, respectively. After that, the optimum parameter by both physical and chemical modification can be used at the same time. A small amount of ce- ment can be also added into the masonry material since we should let it reach their performance requirement, and then choose the optimized dosage. The results show that the hydration activity of fluorgypsum can be improved by both chemical modification and physical modification, but the better choice is to combine them together. The best formula for fluorgypsum masonry materials is ： 5 % cement, 95 % modified fluorgypsum （ including 2 % r-semi-hydrated gypsum, 1% sodium sulfate, 1% calcined alum,4 % slaked lime, 92 % fluorgypsum with grinding 20 minutes）. All the performance index of fluorgypsum masonry materials should meet the standard of＇ masonry cement＇ （GB/T 3183- 2003 ）.
出处
《矿产综合利用》
CAS
北大核心
2016年第6期55-60,共6页
Multipurpose Utilization of Mineral Resources
基金
山东省科技惠民计划项目(No.2014kjhmxq0211)
山东省高等学校科技计划项目(No.J14LG01)
关键词
氟石膏
砌筑材料
物理改性
化学改性
Fluorgypsum
Masonry materials
Physical modification
Chemical modification
