矿渣掺量对偏高岭土基土聚水泥抗压强度及孔结构的影响  

Effect of slag dosage on compressive strength and pore structure of metakaolin-based geopolymeric cement

作　　者：诸华军[1] 姚晓[1] 张祖华[1] 华苏东[1] 陈悦[1] 

机构地区：[1]南京工业大学材料科学与工程学院材料化学工程国家重点实验室,江苏南京210009

出　　处：《南京工业大学学报（自然科学版）》2009年第2期1-4,共4页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家高新技术研究发展计划(863计划)资助项目(2006AA06Z225);南京工业大学博士论文创新基金资助项目(BSCX200706)

摘　　要：为提高偏高岭土基土聚水泥的力学性能，在偏高岭土中加入不同掺量（质量分数10％-50％）的矿渣，分析其对土聚水泥抗压强度的影响，并利用压汞仪和扫描电镜对80℃蒸养3d的土聚水泥试样进行孔结构和断面形貌分析．实验结果表明：随着矿渣掺量的增加，土聚水泥的抗压强度显著提高，孔隙率呈线性减小，孔径分布逐步向微孔方向移动．当矿渣掺量为50％时，80℃蒸养3d和7d后抗压强度分别达到73．4和74．4MPa，3d龄期试块的孔隙率仅为4．46％，孔径尺寸小于20nm．微观结构分析表明，矿渣的加入使土聚水泥结构更加致密，有利于土聚水泥抗压强度的提高．Various additive amounts of slag （ 10% - 50% ） were used to enhance the mechanical property of metakaolin-based geopolymeric cement and the effects on compressive strength were analyzed. Mercury intrusion porosimetry （MIP） and scanning electron microscopy （SEM） were used to analyze the pore structure and morphology of geopolymeric cement samples cured at 80 ℃ for 3 d. Results showed that the compressive strength was enhanced with increasing of the additive amounts of slag, porosity ratio was linearly reduced and the pore size distribution was shifted toward micro-porosity. When 50% slag was used, the compressive strength of geopolymeric cements cured at 80 ℃ for 3 d and 7 d reached 73. 4 MPa and 74. 4 MPa, respectively. Moreover, the porosity of 3 d sample was 4. 46% and the pore size was less than 20 nm. The microstructure analysis confirmed that the geopolymeric cement had a higher strength if the slag was added.

关 键 词：矿渣 偏高岭土 土聚水泥 抗压强度 孔结构 

分 类 号：TQ172.4[化学工程—水泥工业]