MgO-(NH_4)_2HPO_4-K_2HPO_4-H_2O新型磷酸镁水泥  

New Magnesia-Phosphate Cement Based on MgO-(NH_4)_2HPO_4-K_2HPO_4-H_2O System

作　　者：焦宝祥[1] 周启兆[1,2] 阎晓波[1] 丁胜 刘孝江 蔡玉斌 成扬 

机构地区：[1]盐城工学院材料工程学院,江苏盐城224051 [2]盐城市交通局,江苏盐城224003

出　　处：《建筑材料学报》2012年第1期131-134,共4页Journal of Building Materials

基　　金：江苏省交通厅科技项目(08Y07-1);建设部科研开发项目(2008-K4-35);盐城工学院校级科研项目(XKY2009037)

摘　　要：用低酸度磷酸盐(NH42)HPO4和K2HPO4制备了凝结时间可控、强度高的新型磷酸镁水泥(MPC).结果表明:由低酸度磷酸盐制备的MPC,在水料比和缓凝剂用量一定的情况下,随着n((NH4)2HPO4)/n(K2HPO4)的降低,其浆体的流动性增强,凝结时间延长;添加K2HPO4后,MPC的早期抗压强度略有降低,但其28d抗压强度高达70 MPa以上;MPC的水化产物为NH4MgPO4·6H2O和KMgPO4·6H2O.A new type of magnesia-phosphate cement（MPC）that has high strength and controllable setting time was prepared by low acidity phosphates （NH4）2HPO4 and K2HPO4 as raw materials. The results show that the new MPC has better fluidity and longer setting time with the decrease in （NH4）2HPO4/ K2 HPO4 molar ratio in the case of fixed mw/rnc ratio and retarder dosage. Early compressive strength of the new MPC after adding K2 HPO4 decreases slightly, while 28 d compressive strength of the new MPC is all above 7O MPa. The main hydration products of MPC are NH4MgPO4 · 6H2O and KMgPO4 · 6H2O.

关 键 词：磷酸镁水泥 低酸度磷酸盐 流动特性 凝结时间 

分 类 号：TQ177.5[化学工程—硅酸盐工业]