磷酸二氢钾粒度对磷酸钾镁水泥性能影响  

Effect of size of potassium dihydrogen phosphate on properties of magnesium potassium phosphate cement

作　　者：段新勇[1] 吕淑珍[1] 赖振宇[1] 卢忠远[1] 廖其龙[1] 

机构地区：[1]西南科技大学四川省非金属复合与功能材料重点实验室-省部共建国家重点实验室培育基地,四川绵阳621010

出　　处：《功能材料》2015年第7期7062-7066,7071,共6页Journal of Functional Materials

基　　金：国家重点基础研究发展计划(973计划)资助项目(2012CB722707);西南科技大学拉美研究中心重点资助项目(12sl1P01);西南科技大学博士基金资助项目(12ZX7130);西南科技大学研究生创新基金资助项目(14ycx019)

摘　　要：KH2PO4作为磷酸钾镁水泥主要原材料,与其性能直接相关。研究了KH2PO4粒度对磷酸钾镁水泥的流动性、凝结时间、抗压强度、粘接强度、水化浆体温度和孔隙率等方面的影响。结果表明,随着KH2PO4粒径的减小,磷酸钾镁水泥的凝结时间缩短,流动度先增加后减小;材料抗压强度和粘接强度逐渐增大,中位粒径为45μm时,3h抗压强度达32 MPa,1d粘接强度达4.3MPa;KH2PO4的粒度对磷酸钾镁水泥的水化热有较大影响,对于100mm×100 mm×100mm的试块,成型后中心最高温度逐渐升高,最高可达79.5℃;随着KH2PO4粒径降低,磷酸钾镁水泥的平均孔径降低,孔隙率降低,材料致密程度相应提高。同时,粒径的减小也明显减轻了磷酸钾镁水泥所存在的"泛霜"现象。As the raw material of potassium-magnesium phosphate cement,KH2PO4 was directly associated with performance of as prepared materials.Effects of KH2PO4 size on setting time,compressive strength,fluidity,adhesive strength,slurry temperature and porosity of the potassium-magnesium phosphate cement are studied in this paper.Results showed that as the KH2PO4 particle size decreases,setting time of potassium-magnesium phosphate cement shortened,fluidity of materials increases and then decreases with minimum particle size in this study,compressive strength and adhesive strength increases with finer KH2PO4,when medium particle size was 45μm,3hcompressive strength of cement was up to 32 MPa,1dadhesive strength was 4.3 MPa.Particle sizes of KH2PO4 have significant effects on hydration heat of phosphate potassium magnesium cement.For samples with 100mm×100mm×100mm,central temperature gradually increased,the maximum temperature was up to 79.5℃.As particle size of KH2PO4 was lessen,mean pore size of phosphate potassium magnesium cement reduced and lower porosity also can be gotten.The paper also found that finer particle size of KH2PO4 can significantly reduce'efflorescence'phenomenon of the potassium-magnesium phosphate cement.

关 键 词：磷酸二氢钾 粒度 磷酸钾镁水泥 性能 

分 类 号：TU52[建筑科学—建筑技术科学]