摘要
采用结晶水法测定掺加不同种类激发剂硬石膏的水化率以表征激发效果，并通过XRD和SEM对水化产物的相组成和形貌进行表征．优选出适合天然硬石膏基粉刷石膏的激发剂。在此基础上以天然硬石膏为基材制备出粉刷石膏，并对其工作性能、水化硬化性能等进行检测。结果表明，激发剂可显著改善硬石膏活性，不同种类和掺量影响差别较大。单掺5％煅烧明矾28d水化率可达75％，单掺2％硫酸亚铁和2％草酸钠28d水化率可达60％；复合激发剂激发效果优于单掺，28d水化率超过85％；制备的硬石膏基粉刷石膏水化率大于等于80％、初凝时间为1～2h、抗压强度超过20MPa且无返霜现象，其他性能符合JC517．2004。
This paper investigated the effects of activators＇ category and dosage on hydration rate of natural anhydrite by testing the percentage composition of crystallization water. At the same time, the characterization of hydration products was carried out by means of X-ray diffraction （XRD） and scanning electron microscope （SEM）. Then the gypsum plaster with natural anhydrite was produced and tested on the basis of the optimization activators. The results showed that the hydration activity of natural anhydrite could be improved observably with activators＇ category and dosage. When the dosage of calcining alum is 5%, the hydration rate can reach 75%. When the dosage of ferrous sulfate or sodium oxalate is 2%, the hydration rate can reach 60%. The effect of compound activator is better than that of single activator, and the hydration rate can reach 85%. The properties of anhydrite-based gypsum plaster conform to the JC 517-2004, hydration rate no less than 80%, initial setting time in 1-2 h, compressive strength more than 20 MPa and no return cream phenomenon.
出处
《非金属矿》
CAS
CSCD
北大核心
2013年第3期46-49,共4页
Non-Metallic Mines
基金
安徽省教育厅自然科学研究重点项目(KJ2010A059)
关键词
天然硬石膏
粉刷石膏
激发剂
水化率
natural anhydrite gypsum plaster activators hydration rate
