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掺Na2HPO4·12H2O的磷酸铵镁水泥净浆性能研究
作者：吴发红1，2，盛东1，2，杨建明1，张洁3，崔磊1，2，王毓1，2
（1.盐城工学院 土木工程学院，江苏 盐城 224001；2.安徽理工大学 土木建筑学院，安徽 淮南 232001；
3.石家庄铁道大学 材料科学与工程学院，河北 石家庄 050043）
摘要：为改善磷酸铵镁水泥（MAPC）净浆性能，采用Na2HPO4·12H2O取代部分NH4H2PO4，与重烧氧化镁、硼砂、水制成含Na2HPO4·12H2O的新型MAPC。通过测试pH值、水化温度、凝结时间、抗压强度，并对硬化体进行热重、XRD、SEM等微观分析发现，掺入适量的Na2HPO4·12H2O可以降低浆体的初始温度、反应液最低温度及pH值，延长MAPC净浆的凝结时间，大幅提高MAPC净浆硬化体的早期抗压强度，对60 d抗压强度也有一定的改善作用，其中Na2HPO4·12H2O掺量为15%时对抗压强度的改善作用最明显。
关键词：磷酸铵镁水泥（MAPC）；Na2HPO4·12H2O；pH值；水化温度；凝结时间；强度
中图分类号：TU526 文献标识码：A 文章编号：1001-702X（2019）02-0010-05
Study on the properties of magnesium ammonium phosphate cement paste with Na2HPO4·12H2O
WU Fahong1，2，SHENG Dong1，2，YANG Jianming1，ZHANG Jie3，CUI Lei1，2，WANG Yu1，2
（1.Civil Engineering College，Yancheng Institute of Technology，Yancheng 22400，China；
2.College of Civil and Architecture Engineering，Anhui University of Science and Technology，Huainan 232001，China；
3.College of Materials Science and Engineering，Shijiazhuang Tiedao University，Shijiazhuang 050043，China）
Abstract：In order to improve the properties of magnesium ammonium phosphate cement（MAPC） paste，Na2HPO4·12H2O was
used to replace part of NH4H2PO4，and a new MAPC containing Na2HPO4·12H2O was prepared with overburnt magnesium oxide，borax and water. By testing pH value，hydration temperature，setting time and compressive strength，and microscopic analysis such as TG，XRD，SEM of the hardened sample，it was found that a proper amount of Na2HPO4·12H2O can reduce the initial temperature of the paste，the minimum temperature and pH value of the reaction solution，thus prolonging the setting time of the MAPC paste to a certain extent. In addition，the early strength of hardened MAPC paste can be improved greatly by adding a proper amount of Na2HPO4·12H2O，and the strength of 60 days can also be improved to a certain extent，among which the improvement of the compressive strength is best when the amount of Na2HPO4·12H2O is 15%.
Key words：MAPC，Na2HPO4·12H2O，pH value，hydration temperature，setting time，strength