矿物掺合料混凝土水化过程电化学阻抗参数变化试验分析.pdfVIP

学兔兔 2015年 第 6期 (总 第 308期 ) 混 凝 土 理 论 研 究 Number 6 in 2015(Total No．308) Concrete THEORETICAL RESEARCH doi：10．3969／j．issn．1002~550．2015．06．011 矿物掺合料混凝土水化过程电化学 阻抗参数变化试验分析 刘龙海，施棉军 (湖南工业大学 土木工程学院，湖南株洲412000) 摘 要：通过在普通混凝土中添加矿物掺合料，得到具有不同特性的混凝土试验样本，并利用电化学阻抗谱法，在混凝土不同龄 期对这些试验样本研究了其水化过程中电化学阻抗参数的变化情况。研究结果表明，采用不同的掺合料后混凝土在电化学阻抗 谱变化趋势方面并无明显改变，但采用矿物掺合料后能够形成更为致密的混凝土结构。在混凝土水化早期矿物掺合料会降低阻 抗参数R 、R 和r，，但在水化后期由于矿物掺合料的二次水化作用，会大幅提高阻抗参数。 关键词：矿物掺合料；混凝土；水化过程；电化学阻抗谱 中图分类号：TU528．01 文献标志码：A 文章编号：1002—3550(2015)06—0046—04 Experiment and analysis on the electrochemical impedance spectroscopy influenced by mineral admixture during cement hydration process uuLonghm．SillMianjun (School ofCivil Engineering，Hunan University ofTechnology Institute，Zhuzhou 412000，China) Abstract：Concrete samples mixed with mineral admixture were made．All the samples were based on ordinary cement．And using these samples and the method of electrochemical impedance spectroscopy，impedance parameters during the different ages of cement hydration process were studied．The result shows that the shape of curve of nyquist and the electrochemical impedance spectroscopy did not change obviously on the condition of using different portion of mixture．But more dense structure could be got．In the early age of hydration，U— sing fly ash or slag could reduce the value of R 、R t and or．But in the final age of hydration，because of the secondary hydration of min— eral admixture，the values of R…R and or could be increased． Key words：mineral admixture；concrete；