含重金属Pb的磷酸钾镁水泥性能  

Properties of Magnesium Potassium Phosphate Cement Containing Heavy Metal Pb

作　　者：徐选臣[1,2] 杨建明[1,2] 顾玉萍 

机构地区：[1]盐城工学院土木工程学院,江苏盐城224051 [2]江苏省生态建材与环保装备协同创新中心,江苏盐城224051

出　　处：《建筑材料学报》2016年第1期29-34,共6页Journal of Building Materials

基　　金：住房和城乡建设部科研开发项目(2011-K4-23;2013-K7-4;2013-K4-41);江苏省科技厅项目(BY2013057-05)

摘　　要：测试了掺Pb(NO_3)_2的磷酸钾镁水泥(MKPC)浆体的流动度、凝结时间、抗压强度、收缩变形和重金属Pb的浸出质量浓度,分析了MKPC浆体的水化放热特性、物相组成和微观形貌.结果表明:复合缓凝剂和适量Pb(NO_3)_2可有效延缓MKPC浆体的凝结时间;掺入适量Pb(NO_3)_2虽然会降低MKPC浆体的抗压强度,并使其收缩变形略微增加,但掺10%(质量分数)Pb(NO_3)_2的MKPC浆体28d抗压强度仍大于20MPa,其收缩变形仍比硅酸盐水泥砂浆小1个数量级;在相同水化龄期,MKPC浆体中重金属Pb的浸出质量浓度随着Pb(NO_3)_2掺量的增加逐步升高,但在掺10%Pb(NO_3)_2的MKPC浆体中,重金属Pb的浸出质量浓度仍远低于GB 5085.3—2007标准要求.To study properties of magnesium potassium phosphate cement（MKPC）containing heavy metal Pb,the fluidity,setting time,compressive strength,shrinkage deformation and leachate mass concentration of heavy metal Pb were determined.Its hydration heat,phase composition and micro structure were analyzed.The result indicates that the composite retarder and some Pb（NO3）2are able to effectively retard setting of MKPC paste.Adding of some Pb（NO3）2reduces the compressive strength of MKPC paste and slightly increases its shrinkage deformation,but 28 dcompressive strength of MKPC paste with 10%（by mass）Pb（NO3）2 is higher than 20 MPa and its shrinkage deformation is almost one order of magnitude lower than that of Portland cement mortar.Pb leachate mass concentration in MKPC paste gradually increases with increase of Pb（NO3）2content,Pb leachate mass concentration in MKPC paste with 10%Pb（NO3）2is much lower than that set forth in the standard of‘Identification of standard for hazardous wastes＇（GB 5085.3—2007）.

关 键 词：磷酸钾镁水泥 重金属PB 抗压强度 Pb浸出质量浓度 

分 类 号：TU528.31[建筑科学—建筑技术科学]