偏高岭土和粉煤灰对大流动性磷酸钾镁水泥抗盐冻性能的影响  

Effect of fly ash and metakaolin on salt-frost resistance of high fluidity magnesium potassium phosphate cement

作　　者：陶涛 杨建明[2] 李涛 纪荣健 TAO Tao;YANG Jianming;LI Tao;JI Rongjian(Fuculty of Civil Engineering and Mechanics,Jiangsu University,Zhenjiang 212013,China;Department of Civil Engineering,Yancheng Institute of Technology,Yancheng 224051,China;College of Civil Engineering,San Jiang University,Nanjing 210012,China)

机构地区：[1]江苏大学土木工程与力学学院,江苏镇江212013 [2]盐城工学院土木工程学院,江苏盐城224051 [3]三江学院土木工程学院,江苏南京210012

出　　处：《混凝土》2021年第4期87-90,95,共5页Concrete

基　　金：国家自然科学基金项目(51578475)。

摘　　要：对掺加偏高岭土和粉煤灰的大流动性磷酸钾镁水泥(MKPC)浆体试件进行快速冻融试验,测定不同冻融循环周期的MKPC试件的强度、吸水率,并分析MKPC试件的微观结构、物相组成。试验结果表明:偏高岭土和粉煤灰的掺入可以降低MKPC试件在冻融过程中的强度损失和吸水率变化;由微观分析可以看出,粉煤灰中的球状颗粒具有填充效应,且偏高岭土和粉煤灰的掺入都会参与水化反应生成新的产物,可以很好的提高MKPC硬化体的密实度,改善磷酸钾镁水泥的抗盐冻性能。The magnesium potassium phosphate cement(MKPC)paste samples with high fluidity added with metakaolin and fly ash were tested by fast freezing and thawing experiment and then the strength and water absorption of different freeze-thaw cycles were measured.Meanwhile,analysis of microstructure and phase composition by means of SEM and XRD.The experimental results show that the incorporation of metakaolin and fly ash can reduce the strength loss and water absorption of MKPC samples during freeze-thaw cycles.The improvement of salt resistance of MKPC specimens by metakaolin and fly ash is more obvious.From microscopic analysis it can be concluded that the spherical particles in fly ash have filling effect,and the addition of metakaolin and fly ash would participate in the hydration reaction to generate new hydration products,and the spherical particles of fly ash have filling effect,which can improve the compactness of hardened MKPC paste and the salt-frost resistance of MKPC.

关 键 词：大流动性 磷酸钾镁水泥 矿物掺合料 抗盐冻性 

分 类 号：TU528.041[建筑科学—建筑技术科学]