磷石膏水泥复合湿拌砂浆配合比优化研究  

The study on optimization of mix proportion for wet mixed mortar with phosphogypsum and cement

作　　者：周远忠[1,2] 吴福飞 王宏杰[2] 陈鸿 李杰 ZHOU Yuanzhong;WU Fufei;WANG Hongjie;CHEN Hong;LI Jie(School of Materials and Architectural Engineering,Guizhou Normal University,Guiyang 550025,China;Guizhou Yukun Environmental Protection Building Material Co.Ltd.,Guiyang 550017,China)

机构地区：[1]贵州师范大学材料与建筑工程学院,贵州贵阳550025 [2]贵州宇昆环保建材有限公司,贵州贵阳550017

出　　处：《新型建筑材料》2022年第5期53-56,61,共5页New Building Materials

基　　金：贵州省科技厅社会发展支撑项目[黔科合支撑(2019)2862];贵州师范大学博士科研基金项目(GNUD[2017]3号)。

摘　　要：采用磷石膏制备磷石膏水泥复合湿拌砂浆用于墙体抹灰中,研究了磷石膏、水泥、增塑剂用量及养护方式对湿拌砂浆性能的影响,并分析其作用机理。结果表明,磷石膏水泥复合湿拌砂浆的优化配合比为:磷石膏600 kg/m^(3)、水泥300 kg/m^(3)、增塑剂6 kg/m^(3)、机制砂564 kg/m^(3)、水280 kg/m^(3),其中磷石膏掺量为41%,所制备的湿拌砂浆性能优于GB/T 25181—2019《预拌砂浆》的要求。SEM分析表明,磷石膏在碱性环境中与水泥的水化产物发生反应,生成具有膨胀性的水化硫铝酸钙(AFt);另外,磷石膏颗粒较细,能填充于孔隙中,使其界面结构较为密实。This study used phosphogypsum to prepare wet mixed mortar in wall plastering.The effects of phosphogypsum dosage,cement dosage,plasticizer dosage and curing conditions on the properties of mortar were discussed,and its mechanism of action was analyzed.The results show that the optimum proportion of phosphogypsum compound cement mortar is 600 kg/m^(3) of phosphogypsum,300 kg/m^(3) of cement,6 kg/m^(3) of plasticizer,564 kg/m^(3) of machine-made sand and 280 kg/m^(3) of water,and the proportion of phosphogypsum is 41%,its performance is better than the requirements of GB/T 25181—2010"Ready-Mixed Mortar".Through SEM analysis,it was found that phosphogypsum reacted with hydration products formed by cement in alkaline environment to form hydrated calcium sulfoaluminate(AFt)with expansive properties.In addition,the phosphogypsum particles are finer and can be filled in the pores,making the interface structure relatively denser.

关 键 词：磷石膏 水泥 湿拌砂浆 微观结构 墙体抹灰 

分 类 号：TU578.1[建筑科学—建筑技术科学]