缓凝剂对磷酸镁水泥工作性能的影响  

THE INFLUENCE OF RETARDERS ON THE WORKABILITY OF MAGNESIUM PHOSPHATE CEMENT

作　　者：马欣 MA Xin(School of Materials Science and Engineering,Shenyang Ligong Universtiy,Shenyang 110158,China)

机构地区：[1]沈阳理工大学材料科学与工程学院,沈阳110158

出　　处：《低温建筑技术》2024年第5期9-11,23,共4页Low Temperature Architecture Technology

摘　　要：磷酸镁水泥是由重烧氧化镁和磷酸二氢钾通过酸碱反应生成的磷酸镁盐类胶凝材料,具有凝结硬化快、早期强度高、低pH环境、良好的生物相容性等特点。但磷酸镁水泥凝结时间过快,在一定程度限制了其应用。为提高磷酸镁水泥工作性能,文中研究了硼砂、硼酸、氯化钙对磷酸镁水泥凝结时间和水化放热性能的影响。研究结果表明,硼砂掺量为8%时,磷酸镁水泥的凝结时间最长达到19.5min;硼酸掺量为2%时,磷酸镁水泥的凝结时间最长达到23min;硼砂掺量为4%时,磷酸镁水泥的凝结时间最长达到45.1min。研究可为磷酸镁水泥缓凝材料的研发奠定基础。Magnesium phosphate cement features fast setting and hardening,high early strength,low pH environ⁃ment,and good biocompatibility,which is a magnesium phosphate salt based cementitious material produced by the acid-base reaction of calcined magnesium oxide and potassium dihydrogen phosphate,however it is subjected to the fast-setting time.The effectiveness of borax,boric acid,and calcium chloride on the setting time and hydration heat release performance of magnesium phosphate cement is studied to improve the workability of magnesium phosphate cement.The results show that the setting time of magnesium phosphate cement is the longest when the addition of bo⁃rax is 8%,reaching 19.5 minutes;when the addition of boric acid is 2%,the setting time of magnesium phosphate ce⁃ment is the longest,reaching 23 minutes;when the addition of borax is 4%,the setting time of magnesium phosphate cement is the longest,reaching 45.1 minutes.Thestudy maylay a foundation for the development of magnesium phos⁃phate cement-based retarder materials.

关 键 词：磷酸镁水泥 凝结时间 水化放热 

分 类 号：TU528[建筑科学—建筑技术科学]