氯化钾对硫氧镁水泥性能的影响

关键字：氯化钾,硫氧镁,水泥,性能,影响

（1.中国科学院青海盐湖研究所，青海 西宁  810008；2.青海省盐湖资源化学重点实验室，青海 西宁  810008；
3.中国科学院大学，北京  100049）

    摘要：以改性硫氧镁水泥（MOS）为基础体系，研究了氯化钾掺量对MOS体系凝结时间、抗压和抗折强度及抗水性的影响，并对MOS的物相组成和微观形貌进行了分析。结果表明：氯化钾的掺入可延长MOS的凝结时间；氯化钾不利于MOS抗压强度的提高，但可以明显提高MOS的抗折强度。同时氯化钾提高了MOS抗压强度软化系数而降低了抗折强度软化系数。硫酸镁水泥中氯化钾掺量应控制在3%～5%。
    关键词：硫氧镁水泥；氯化钾；力学性能；抗水性
    中图分类号：TU528；TQ172.1+2      文献标识码：A        文章编号：1001-702X（2017）11-0079-05
 

Effects of potassium chloride on the property of magnesium oxysulfate cement
AN Shengxia1，2，3，XIAO Xueying1，2，LI Ying1，2，WEN Jing1，2，CHANG Chenggong1，2，
DONG Jinmei1，2，ZHENG Weixin1，2，HUANG Qing1，2，3
（1.Qinghai Institute of Salt Lakes，Chinese Academy of Sciences，Xining 810008，China；
2.Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province，Xining 810008，China；
3.University of Chinese Academy of Sciences，Beijing 100049，China）

    Abstract：Taking modified magnesium oxysulfate cement（MOS） as the basis system，the effects of the potassium chloride on the setting time，compressive and flexural strength，water resistance of MOS were investigated. The component and microstructure of the MOS were discussed. The results demonstrate that the addition of potassium chloride can extend the setting time of the MOS. The potassium chloride is not conducive to the improvement of MOS compressive strength, but can significantly improve the flexural strength. Besides，the existence of potassium chloride improves the softening coefficient of compressive strength and reduces the softening coefficient of flexural strength. So the content of potassium chloride in magnesium oxysulfate cement should be controlled in 3% to 5%.
    Key words：magnesium oxysulfate cement，potassium chloride，mechanical property，water resistance