摘要
为分析钢渣粉替代量、比表面积对钢渣-水泥复合材料微观孔隙结构特征的影响,对替代量、比表面积不同的钢渣-水泥复合材料试件进行了低场核磁共振试验。结果表明:钢渣粉替代量、比表面积不同,试件中吸附水含量变化较大,试件中孔隙水、自由水变化不大;钢渣粉比表面积(350m^2/kg、427m^2/kg)替换部分水泥(0~20%),对复合材料孔隙结构有较大影响,表现在28d龄期时,复合材料孔隙率增大,替代量0时孔隙率最小为17.3%,替代量20%时孔隙率最大为23%,最可几孔半径增大,孔径分布变化等;钢渣粉比表面积一样,钢渣粉替代量(0~20%)小幅增加时,复合材料孔隙率增大,最可几孔径增大,随替换量增加孔隙率增大(20%~23%)不明显、孔径分布变化不大;当钢渣粉掺量不变,比表面积(350m^2/kg、427m^2/kg)增大时,复合材料孔隙率减小,最可几孔径减小,孔径分布变窄。
For analysis of steel slag powder instead of volume,specific surface area of steel slag-the micro pore structure characteristics of the cement composite materials,the replacement amount,different specific surface area of steel slag cement composite material samples tested low field nuclear magnetic resonance(NMR).The results show that the amount of steel slag powder replacement,specific surface area,adsorption of water content in the sample change is bigger,the pore water and free water in the specimen did not change much;specific surface area of steel slag powde(350m^2/kg,427m^2/kg)to replace partial cement(0~20%),the composite material has a great influence on the pore structure,at the age of 28d,the porosity of the composite material increases,and the minimum porosity is 17.3%when the replacement quantity is 0,when the replacement amount 20%porosity up to 23%,most probable aperture radius increases,the pore size distribution changes and so on;the specific surface area of steel slag powder is the same.When the substitution amount of steel slag powder(0~20%)increases slightly,with the increase of the porosity,the maximum pore size of the composite material can be increased.The increase of the porosity(20%~23%)with the increase of the replacement amount is not obvious and the pore size distribution does not change much,when the content of steel slag powder remains unchanged and the specific surface area(350m^2/kg,427m^2/kg)increases,the porosity of the composite material decreases,and the pore size distribution becomes narrow.
作者
朱琳
晋强
胡荻
ZHU Lin;JIN Qiang;HU Di(College of Water Conservancy and Civil Engineering of Xinjiang Agricultural University,Urumqi 830052,China)
出处
《粉煤灰综合利用》
CAS
2020年第4期71-76,共6页
Fly Ash Comprehensive Utilization
基金
新疆维吾尔自治区高校科研计划青年教师科研启动项目(XJEDU2016S050)。
关键词
低场核磁共振技术
钢渣粉
掺量
比表面积
孔隙结构特征
low field nuclear magnetic resonance technique
steel slag powder
replaces content
specific surface area
pore structure characteristics
