摘要
交流阻抗是一种灵敏的无损结构测试方法,利用该方法可以可靠并准确地表征体系微观结构的变化。用交流阻抗方法对碱激发矿渣水泥和硅酸盐水泥的水化和微观结构进行研究,并提出了合适的等效电路模型,其中R1和R3分别表示连通孔和非连通孔内导电路径的电阻,n2是与毛细孔有关的常相角指数,n3与凝胶孔有关。实验结果表明R1、R3以及n2均随水化龄期的延长而增大,且碱激发矿渣水泥浆体电阻R1和R3均大于硅酸盐水泥浆体,n2则相反。碱激发矿渣水泥浆体n3在0.93～0.99范围内变化,而硅酸盐水泥浆体n3值则基本保持为0.75不变。
Impedance spectroscopy is a sensitive and non-destructive test method and can be used to reliably and accurately characterize the microstructure modifications of cement-based materials.The hydration and microstructure of alkali-activated slag cement and portland cement have been studied by impedance spectroscopy and equivalent circuit model has also been proposed where R1 and R3represented the resistances of continuous and discontinuous conductive paths,n2 was the constant phase angle index related to the capillary pores while n3 was related to the gel pores.Results showed that R1,R3 and n2 were increased with the prolonged hydration time and R1 and R3in alkali-activated slag cement were larger than those in portland cement,however n2 was on the contrary.n3 was varied between 0.93and0.99 in alkali-activated slag cement and was nearly 0.75 in portland cement.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2015年第20期130-135,共6页
Materials Reports
基金
国家自然科学基金(51378196
51461135001
U1305243)
关键词
碱激发矿渣水泥
硅酸盐水泥
交流阻抗
微观结构
等效回路
alkali-activated slag cement
portland cement
impedance spectroscopy
microstructure
equivalent circuit model
