基于热氧老化的碳纳米管沥青混合料电热稳定性分析  

Thermal stability analysis of carbon nanotube asphalt mixture based on thermal oxygen aging

作　　者：栾利强 王钦佩[2] LUAN Liqiang;WANG Qinpei(Guangxi Key Laboratory of Rock and Soil Mechanics and Engineering,Guilin 541004,China;School of Civil Engineering,Guilin University of Technology,Guilin 541004,China)

机构地区：[1]广西岩土力学与工程重点实验室,广西桂林541004 [2]桂林理工大学土木工程学院,广西桂林541004

出　　处：《功能材料》2025年第2期2229-2236,共8页Journal of Functional Materials

基　　金：国家自然科学基金项目(52169022);广西科技基地和人才专硕(桂科AD19110085)。

摘　　要：为解决导电沥青路面服役老化后电热性能不稳定而衰减的问题,强化融雪化冰效果,减少养护次数和费用。将不同碳纳米管(CNTs)掺量的沥青混合料进行热氧老化,用二极法测试试件的整体和纵向深度上的电导率,研究CNTs对热氧老化下的沥青混合料电学性能的影响。通过室内融冰试验,将不同老化条件下的碳纳米管沥青混合料的融冰时间和升温速率进行比对,验证了CNTs对沥青混合料电热稳定性具有积极的影响。将不同老化时间后的0%、0.9%CNTs掺量的混合料试件中的沥青回收后进行四组分试验,进而分析CNTs对导电稳定性的影响机理。结果表明,CNTs一定程度上抑制了沥青轻质组分的挥发,削弱了热氧老化的影响,提升沥青混合料电热稳定性及融冰效果。In order to solve the problem that the electric heating performance of conductive asphalt pavement is unstable and attenuating after service aging,the effect of snow melting and ice melting is strengthened,and the frequency and cost of maintenance are reduced.The asphalt mixture with different carbon nanotubes(CNTs)was subjected to thermal oxygen aging,and the electrical conductivity at the whole and longitudinal depth of the specimen was tested by bipolar method,and the influence of CNTs on the electrical properties of the asphalt mixture under thermal oxygen aging was studied.Through the indoor melting test,the melting time and heating rate of carbon nanotubes asphalt mixture under different aging conditions were compared,and it was verified that carbon nanotubes had a positive effect on the electric heating stability of asphalt mixture.After recovering bitumen from mixture samples with 0%and 0.9%CNTs content after different aging times,four-component tests were conducted to analyze the influence mechanism of CNTs on conductive stability.The results showed that CNTs inhibited the volatilization of asphalt light components to a certain extent,weakened the influence of hot oxygen aging,and improved the electric stability and melting effect of asphalt mixture.

关 键 词：沥青混合料 碳纳米管 热氧老化 电热性能 融雪化冰 

分 类 号：U414[交通运输工程—道路与铁道工程]