掺合料对磷酸镁水泥的性能影响及机理研究  

Effect of admixtures on properties of magnesium phosphate cement and the mechanism

作　　者：李春梅[1,2] 王培铭[2] 王安[1] 伊安海[1] 

机构地区：[1]山东水利职业学院,山东日照276826 [2]同济大学先进土木工程材料教育部重点实验室,上海200092

出　　处：《混凝土》2015年第1期115-117,125,共4页Concrete

基　　金：山东省高等学校优秀青年教师国内访问学者项目

摘　　要：研究了粉煤灰、矿渣粉、磷渣粉和硅灰等四种活性掺合料分别对磷酸镁水泥(MPC)工作性能和力学性能的影响,并探讨了掺合料在MPC中的水化机理。结果表明:粉煤灰、矿渣粉、磷渣粉、硅灰的最佳掺量分别为20%、20%、30%、5%,掺入磷渣粉M PC浆体的流动性和缓凝效果最优,矿渣粉和硅灰对浆体的缓凝效果不明显;随着掺合料的添加,水泥石的28 d抗压强度都有一定程度提高,抗折强度呈下降趋势。但掺入硅灰使抗折强度有所提高。掺合料化学组成和碱性不同,电离出的OH-和掺合料活性影响MPC水化体系水化进程。Influence of four different mineral admixtures i.e. fly ash, blast furnace slag, phosphorus slag and silica fume on workability and mechanical properties of magnesium phosphate cement（MPC） mortar was studied respectively, then the hydration mechanism was discussed.The results show that the optimal content of fly ash,blast furnace slag,phosphorus slag and silica fume mineral is 20% ,20%, 30%and 5% ,the retarding effect and fluidity of MPC mortar by mixing phosphorus slag.is best.The setting time to a certain extent and phosphorus slag is the most obvious,and the retarding effect of blast furnace slag and silica fume is not obvious for ~ mortar.With increase of mineral admixtures, the compressive strength of hardened cement paste at 28 days is increased to different extent but the flexural strength reduced all through except for silica fume.Ehemical constitution and alkalinity is different,ionization of OH^- and activity influence hydration process of MPC.

关 键 词：磷酸镁水泥(MPC) 掺合料 性能 水化机理 

分 类 号：TU528.041[建筑科学—建筑技术科学]