基于电化学阻抗谱的石灰石粉硬化水泥浆体孔结构演化研究
Pore Structure Evolution of Limestone Powder Hardened Cement Slurry Based on Electrochemical Impedance Spectroscopy
朱鹏飞 1余熠 2石研然 2杨恒 2何旸 2徐菲 2蒋林华 3储洪强 3徐天磊 2徐宁2
作者信息
- 1. 南京水利科学研究院材料结构研究所,南京 210024;河海大学力学与材料学院,南京 210098
- 2. 南京水利科学研究院材料结构研究所,南京 210024
- 3. 河海大学力学与材料学院,南京 210098
- 折叠
摘要
为了研究大掺量(质量分数为20％以上)石灰石粉硬化水泥浆体的孔结构演化行为,本文基于电化学阻抗谱(EIS)、压汞(MIP)测试分析,探究大掺量石灰石粉对硬化水泥浆体EIS拓扑结构和孔结构参数的影响规律,并建立大掺量石灰石粉硬化水泥浆体的微观结构等效电路,研究等效电路中元器件和孔结构参数之间的关系.结果表明:随水化龄期的延长,石灰石粉掺量对EIS拓扑结构参数中Bode角和θmax的影响规律显著,大掺量石灰石粉硬化水泥浆体的孔径分布整体由大孔和毛细孔向过渡孔和凝胶孔发展演化;另外,EIS等效电路中电阻随硬化水泥浆体中毛细孔含量的增加而减小,电容随硬化水泥浆体中凝胶孔含量的增加而减小.
Abstract
In order to study the pore structure evolution behavior of the hardened cement slurry with high-dosage(mass fraction above 20％)limestone powder,based on electrochemical impedance spectroscopy(EIS)and mercury porosimetry(MIP)test analysis,the influence of high-dosage limestone powder on the EIS topological structure and pore structure parameters of the hardened cement slurry were explored.The microstructural equivalent circuit of hardened cement slurry with high-dosage limestone powder was established,and the relationship between components in the equivalent circuit and pore structure parameters was studied.The results show that the effect of limestone powder content on the EIS topological parameters of Bode angle and θmax is significant with the increase of hydration age,and the pore size distribution of the hardened cement slurry with high-dosage limestone powder content is roughly evolved from large pores and capillary pores to transition pores and gel pores.In addition,the resistance of EIS equivalent circuit decreases with the increase of capillary pore content in hardened cement slurry,and the capacitance decreases with the increase of gel pore content in hardened cement slurry.
关键词
石灰石粉/硬化水泥浆体/孔结构/电化学阻抗谱/等效电路Key words
limestone powder/hardened cement slurry/pore structure/electrochemical impedance spectroscopy/equivalent circuit引用本文复制引用
基金项目
中央级公益性科研院所基本科研业务费专项资金(Y422007)
中央级公益性科研院所基本科研业务费专项资金(Y420017)
中央级公益性科研院所基本科研业务费专项资金(Y422001)
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据