铁道科学与工程学报2026，Vol.23Issue(8)：4046-4054,9.DOI:10.19713/j.cnki.43-1423/u.T20251606
面向性能监测的混凝土温湿耦合导电特性研究
Research on the temperature-humidity combined electrical conductivity characteristics of concrete for performance monitoring
摘要
Abstract
Electrical conductivity measurement,as a nondestructive testing technique,shows great potential for monitoring the evolution of moisture conditions within concrete and evaluating its long-term durability.However,existing concrete electrical conductivity models remain inadequate for describing the coupled effects of temperature and humidity,particularly because they fail to accurately characterize how electrical activation energy varies with the degree of saturation.These limitations restrict the wider application of conductivity-based concrete performance monitoring and evaluation.To address this issue,Archie's law and the Arrhenius equation were theoretically integrated to establish a quantitative relationship between electrical activation energy and the degree of saturation.A concrete electrical conductivity model considering coupled temperature-humidity effects was then proposed,and an equation for calculating concrete moisture saturation under variable-temperature conditions was derived.The model and its parameters were validated and analyzed using existing experimental data.The results indicate that the electrical activation energy of concrete follows a power-law relationship with moisture saturation,and its sensitivity to changes in saturation becomes more pronounced as the internal structure of concrete becomes looser.The developed conductivity model accurately describes the electrical conductivity behavior of concrete under coupled conditions of 0～40℃and 5%～100%saturation.Compared with conventional models that consider only temperature or saturation,the proposed equation for calculating concrete moisture saturation is more reliable under variable-temperature conditions and achieves an evaluation accuracy of up to 97.4%under high-temperature and high-humidity conditions.The coupled temperature-humidity conductivity model established in this study not only accurately describes the electrical response of unsaturated concrete under variable-temperature conditions but also enables quantitative inversion of its internal moisture state,providing a reliable theoretical basis for concrete durability assessment using conductivity-based nondestructive testing.关键词
温湿复合作用/混凝土导电性/导电活化能/温度/饱和度Key words
combined effect/electrical conductivity of concrete/electrical activation energy/temperature/degree of saturation分类
建筑与水利引用本文复制引用
汪毅,钟霄,贺思瑞,张大伟,余志武,伍军..面向性能监测的混凝土温湿耦合导电特性研究[J].铁道科学与工程学报,2026,23(8):4046-4054,9.基金项目
中国中铁股份有限公司科技研究开发计划项目(重大专项课题,编号:2022-专项-09) （重大专项课题,编号:2022-专项-09）
