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Investigations on influencing factors of resistivity measurement for graphite tailings concrete
Cement & Concrete Composites ( IF 10.5 ) Pub Date : 2021-08-04 , DOI: 10.1016/j.cemconcomp.2021.104206
Jing Xue 1, 2, 3 , Xiaomin Wang 1 , Zhongrui Wang 2 , Shuquan Xu 2 , Hongbo Liu 1, 2
Affiliation  

Using graphite tailings (GT) to replace part of sand to prepare graphite tailings concrete (GTC) is an effective way to reduce the environmental hazards. At present, there is still unclear issues on the durability of GTC. Resistivity is an important index to characterize the durability of concrete, and the effect of influencing factors (e.g. applied voltage, measuring electrode) on the measurement of resistivity needs to be studied in depth. Therefore, the accurate measurement of resistivity of GTC is a topic worthy of research.

In this work, four/two-electrode methods and 4 V–32 V of applied voltages are employed for measuring the resistivity of GTC with 3 days–180 days curing ages and the results are compared to those of ordinary Portland concrete (OPC). Meanwhile, the porosity of concrete was tested using MIP to explore the conductive mechanism of GTC. The results show that the applied voltage, measuring electrode and curing age all have a significant impact on the measurement results of the resistivity. For accuracy and stability, the four-electrode method with 12 V of applied voltage is preferred. For convenience, the two-electrode method with 16 V of applied voltage is also acceptable. The porosity of concrete decreases with the increase of curing age, which leads to the decrease of the hole conduction and ionic conduction, thereby increasing the resistivity of concrete. In addition, the addition of GT can reduce the porosity of GTC with the increase of curing age, thereby increasing the resistivity of GTC, which indicates that the durability of GTC has been improved.



中文翻译:

石墨尾矿混凝土电阻率测量影响因素研究

用石墨尾矿(GT)代替部分砂制备石墨尾矿混凝土(GTC)是减少环境危害的有效途径。目前,关于 GTC 的持久性还存在不明确的问题。电阻率是表征混凝土耐久性的重要指标,需要深入研究影响因素(如外加电压、测量电极)对电阻率测量的影响。因此,准确测量GTC的电阻率是一个值得研究的课题。

在这项工作中,采用四/双电极方法和 4 V 至 32 V 的外加电压来测量具有 3 天至 180 天固化年龄的 GTC 的电阻率,并将结果与​​普通波特兰混凝土 (OPC) 的结果进行比较。同时,使用MIP测试混凝土的孔隙率以探索GTC的导电机制。结果表明,外加电压、测量电极和固化时间均对电阻率的测量结果有显着影响。为保证准确性和稳定性,最好采用外加电压为 12 V 的四电极法。为方便起见,外加电压为 16 V 的双电极法也是可以接受的。混凝土的孔隙率随着养护龄期的增加而降低,从而导致空穴传导和离子传导的降低,从而提高混凝土的电阻率。此外,随着固化时间的增加,GT的加入可以降低GTC的孔隙率,从而提高GTC的电阻率,这表明GTC的耐久性得到了提高。

更新日期:2021-08-17
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