文献类型：期刊文献

中文题名：外加剂对硫氧镁水泥性能的影响及其机理研究

英文题名：Effects of addictive on magnesium oxysulfate cement and its mechanism

作者：冯叶[1];朱建斌[2];高至岭[2];沃成昌[2];顾金楼[1]

机构：[1]华东理工大学材料科学与工程学院,上海200237;[2]上海唐盾材料科技有限公司,上海201203

年份：2019

卷号：46

期号：11

起止页码：131

中文期刊名：新型建筑材料

外文期刊名：New Building Materials

收录：CSTPCD;;北大核心:【北大核心2017】；

语种：中文

中文关键词：硫氧镁水泥;明矾;力学性能;耐水性;微观结构

外文关键词：magnesium oxysulfate cement;alums;mechanical properties;water resistance;microstructure

摘要：研究了柠檬酸、硅酸钠、磷酸、明矾、聚丙烯纤维等外加剂对硫氧镁水泥力学性能和耐水性的影响,并采用XRD、FT-IR、SEM等表征硫氧镁水泥的物相组成和微观形貌。结果表明:在改性硫氧镁水泥基体中出现了大量针杆状的5Mg(OH)2·MgSO4·7H2O(517相)硫氧镁晶体。在未掺聚丙烯纤维增强的情况下,以柠檬酸和明矾作为复合外加剂的改性效果最好,抗折、抗压强度和耐水性都大幅提高,并讨论了明矾的改性机理;硫氧镁水泥与聚丙烯纤维有较好的结合作用,为硫氧镁水泥增强改性提供了新思路。
In this paper,the effects of several addictives,such as citric acid,sodium silicate,phosphoric acid,alum and polypropylene fiber,on the mechanical properties and water resistance of magnesium oxysulfate cement were studied.The phase composition and microstructure of the hydration products were analyzed by XRD,FT-IR,and SEM.The results show that a large number of needle-shaped 5Mg(OH)2·MgSO4·7H2O(517 phase)crystals were formed in the modified magnesium oxysulfate cement.In the absence of fiber reinforcement,using citric acid and alum as compound additives had the best modification effect,and their flexural strength,compressive strength and water resistance were greatly improved,meanwhile,the modification mechanism of alum was discussed for the first time.In addition,it has been found that magnesium oxysulfate cement and polypropylene fiber had good binding ability,which provided a new idea for strengthening and modifying magnesium oxysulfatecement.