The role of electronic and ionic conduction in the electrical conductivity of carbon fiber reinforced cement
The role of electronic and ionic conduction in the electrical conductivity of carbon fiber reinforced cement
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DOI：
10.1016/j.carbon.2006.03.013
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发表时间：
2006-09
期刊：
影响因子：
10.9
通讯作者：
Sihai Wen;D. Chung
中科院分区：
文献类型：
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作者：
Sihai Wen;D. Chung
碳纤维增强水泥中的导电与纤维体积分数低于逾渗阈值涉及电子和离子。纤维既影响电子传导又影响离子传导。纤维表面的臭氧处理有助于离子传导。作为混合物的胶乳有助于提供相对高的离子电导率;作为混合物的硅灰有助于提供相对高的电子电导率。在干燥状态下（通过室温干燥达到的实际重要性状态），电子传导比离子传导更重要。在湿态（水饱和态），离子传导占主导地位。当硅灰与纤维一起存在时，干燥状态下的电子贡献分数为0.99。当胶乳与纤维一起存在时，相应的值为0.72-0.78。湿离子电导率与干离子电导率的比率通过纤维表面处理大大增加，并且当使用胶乳而不是硅灰时更高。当存在胶乳时，湿离子电导率远高于干总电导率，但当存在硅灰时，湿离子电导率低于或相当于干总电导率;当纤维未处理且存在硅灰时，湿离子电导率低于干总电导率。
Electrical conduction in carbon fiber reinforced cement with a fiber volume fraction below the percolation threshold involves electrons and ions. The fiber affects both the electronic conduction and the ionic conduction. The ozone treatment of the fiber surface helps the ionic conduction. Latex as an admixture helps provide a relatively high ionic conductivity; silica fume as an admixture helps provide a relatively high electronic conductivity. In the dry state (the state of practical importance attained by room temperature drying), electronic conduction is more significant than ionic conduction. In the wet state (water saturated state), ionic conduction dominates. When silica fume is present with the fiber, the fractional electronic contribution in the dry state is 0.99. When latex is present with the fiber, the corresponding value is 0.72–0.78. The ratio of the wet ionic conductivity to the dry ionic conductivity is much increased by fiber surface treatment and is higher when latex rather than silica fume is used. The wet ionic conductivity is much higher than the dry overall conductivity when latex is present, but is lower than or comparable to the dry overall conductivity when silica fume is present; the wet ionic conductivity is lower than the dry overall conductivity when the fiber is not treated and silica fume is present.