碳纳米管导电沥青混凝土的电学性能研究

Electrical Properties of Carbon Nanotube Conductive Asphalt Concrete

为制备多功能智能化导电沥青混凝土,对碳纳米管沥青混凝土电学特性进行研究,通过室内马歇尔试件测试了在不同油石比、温度与压力下试件电阻率的变化规律,并分析了碳纳米管掺量对试件油敏性、温敏性及压敏性的影响。结果表明:沥青混凝土的电阻率随碳纳米管掺量的增加呈指数式下降,其中1.5wt%为最佳碳纳米管掺量;电阻率与油石比存在线性正相关,在高碳纳米管掺量下,油石比的增大不会引起电阻率急剧变化;碳纳米管的加入能显著降低试件的温敏性,但当碳纳米管达到一定值时,无进一步降低效果;在压力作用下,电阻变化率与压力存在负相关性,较低的碳纳米管掺量对试件结构内部变化更为灵敏,而较高的碳纳米管掺量则具有良好的力学稳定性能。

In order to prepare multifunctional intelligent conductive asphalt concrete,the electrical properties of carbon nanotube asphalt concrete are studied,and the changes of resistivity under different oil-to-rock ratio,temperature and pressure are tested by indoor Marshall specimens,and the effects of carbon nanotube doping on the oil-sensitive,temperature-sensitive and pressure-sensitive specimens are analyzed.The results show that:the resistivity of asphalt concrete decreases exponentially with the increase of carbon nanotube content,and 1.5wt%is the best carbon nanotube content;the resistivity is linearly correlated with the oil-stone ratio,and the increase of oil-stone ratio does not cause a sharp change of resistivity under the high carbon nanotube content;the addition of carbon nanotubes could significantly reduce the temperature sensitivity of the specimens,but when the carbon nanotubes reach a certain value,there is no further reduction.Under pressure,there is a negative correlation between the rate of change of resistance and pressure,and the lower carbon nanotube doping is more sensitive to the internal changes of the specimen structure,while the higher carbon nanotube content has good mechanical stability performance.