硫氧镁水泥改性半水磷石膏试验研究  

Experimental Study on Hemihydrate Phosphogypsum Modified by Magnesium Oxysulfate Cement

作　　者：翁友法 李沫弦 王超凡 陈兵[3] WENG Youfa;LI Moxian;WANG Chaofan;CHEN Bing(Shanghai Harbor Engineering Quality Control&Test Co.Ltd,Shanghai 201315,China;CCCC Shanghai Harbor Engineering Design&Research Institute Co.,Ltd.,Shanghai 200032,China;Department of Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海港湾工程质量检测有限公司,上海201315 [2]中交上海港湾工程设计研究院有限公司,上海200032 [3]上海交通大学土木工程系,上海200240

出　　处：《硅酸盐通报》2023年第6期2115-2120,2130,共7页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(52278265)。

摘　　要：针对半水磷石膏硬化后力学性能低和耐水性能差等问题,采用硫氧镁水泥对其改性,研究了硫氧镁水泥掺量对半水磷石膏凝结时间、力学性能和耐水性能的影响,从微观结构角度分析了硫氧镁水泥改性半水石膏的作用机理。结果表明,掺入硫氧镁水泥显著延缓了半水磷石膏的终凝时间,保证了半水磷石膏的施工操作时间。半水磷石膏溶解电离出的硫酸根离子参与硫氧镁水泥水化,形成稳定的517相填充在二水石膏中,大幅度提升了半水磷石膏的力学性能和耐水性能。Aiming at the problems of low mechanical properties and poor water resistance of hardened hemihydrate phosphogypsum,magnesium oxysulfate cement was used to modify hemihydrate phosphogypsum.The effects of magnesium oxysulfate cement content on setting time,mechanical properties and water resistance of hemihydrate phosphogypsum were investigated.The mechanism of magnesium oxysulfate cement modified hemihydrate phosphogypsum was analyzed from a microscopic point of view.The results show that adding magnesium oxysulfate cement significantly delays the final setting time of hemihydrate phosphogypsum and ensures construction operation time of hemihydrate phosphogypsum.Sulfate ions that dissolved and ionized in hemihydrate phosphogypsum participate in the hydration process of magnesium oxysulfate cement,forming a stable 517 phase filled in dihydrate gypsum,resulting in a great improvement of mechanical properties and water resistance of hemihydrate phosphogypsum.

关 键 词：磷石膏 硫氧镁水泥 凝结时间 抗压强度 耐水性能 

分 类 号：TQ177[化学工程—硅酸盐工业]