纳米碳纤维水泥基材料的电容抗效应

CAPACITANCE RESISTANCE OF CEMENT-BASED MATERIAL WITH CARBON NANOFIBER

研究了烘干与氯盐溶液浸泡条件下不同掺量纳米碳纤维导电水泥基材料的电容抗效应,主要考虑交流电频率、纳米碳纤维掺和电极安装方式的影响。结果表明:在干燥状态下,导电水泥石电容值随着纳米碳纤维掺量的提高而增大,随着交流电频率的增大而下降。当碳纳米纤维掺量低于2.5%时,浸泡氯化钠溶液使导电水泥石的电容显著增加,粘贴式电极的电容值大于埋入式电极试件;当纤维掺量高于2.5%时,浸泡氯化钠溶液和电极安装方式对电容值的影响不大。

The capacitance resistance of conductive cement-based materials with the different con- tents of carbon nanofiber was studied when it suffered from being dried or immersed by chloride solution. The influencing factors were discussed, e.g. , the alternating current frequency, the content of carbon nanofiber and the installation method of electrodes. The results show that the capacitance of conductive cement paste has an increase with the increase of carbon nanofiber content and has a decrease with the increase of AC frequency. When the content of carbon nanofiber is less than 2.5%, the immersion of NaC1 solution leads to a significant increase of the capacitance of conductive cement paste, and the ca- pacitance value of pasting electrode specimen is greater than that of embedded electrode specimen. When the content of carbon fiber is higher than 2.5%, two electrode installation methods and NaC1 solu- tion immersion have little effect on the capacitance.