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

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (1): 35-43.

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

朱鹏飞^{1, 2}, 余熠¹, 石研然¹, 杨恒¹, 何旸¹, 徐菲¹, 蒋林华², 储洪强², 徐天磊¹, 徐宁¹

1.南京水利科学研究院材料结构研究所,南京 210024;
2.河海大学力学与材料学院,南京 210098

收稿日期:2023-07-04 修订日期:2023-09-18 出版日期:2024-01-15 发布日期:2024-01-16
通信作者: 余熠,高级工程师。E-mail:yyu@nhri.cn
作者简介:朱鹏飞(1991—),男,博士研究生。主要从事水工新材料方面的研究。E-mail:zhupengfei_shd@163.com
基金资助:
中央级公益性科研院所基本科研业务费专项资金(Y422007,Y420017,Y422001)

Pore Structure Evolution of Limestone Powder Hardened Cement Slurry Based on Electrochemical Impedance Spectroscopy

ZHU Pengfei^1,2, YU Yi¹, SHI Yanran¹, YANG Heng¹, HE Yang¹, XU Fei¹, JIANG Linhua², CHU Hongqiang², XU Tianlei¹, XU Ning¹

1. Materials & Structural Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210024, China;
2. College of Mechanics and Materials, Hohai University, Nanjing 210098, China

Received:2023-07-04 Revised:2023-09-18 Online:2024-01-15 Published:2024-01-16

摘要/Abstract

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θ_max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。

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

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 θ_max 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.

Key words: limestone powder, hardened cement slurry, pore structure, electrochemical impedance spectroscopy, equivalent circuit

中图分类号:

TQ172

朱鹏飞, 余熠, 石研然, 杨恒, 何旸, 徐菲, 蒋林华, 储洪强, 徐天磊, 徐宁. 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[J]. 硅酸盐通报, 2024, 43(1): 35-43.

ZHU Pengfei, YU Yi, SHI Yanran, YANG Heng, HE Yang, XU Fei, JIANG Linhua, CHU Hongqiang, XU Tianlei, XU Ning. Pore Structure Evolution of Limestone Powder Hardened Cement Slurry Based on Electrochemical Impedance Spectroscopy[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(1): 35-43.

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