碳化硅沥青胶浆自愈合行为研究及最佳掺量的确定  

Study on the Self-healing Behavior of Silicon Carbide Asphalt Mastic and Determination of the Optimal Dosage

作　　者：赵华 唐杰 刘伟男 ZHAO Hua;TANG Jie;LIU Weinan(School of Infrastructure and Engineering,Nanchang University,Nanchang 330031,China;Jiangxi Transportation Research Institute Co.,Ltd.,Nanchang 330052,China;School of Transportation Science and Engineering,Harbin Institute of Technology,Harbin 150090,China)

机构地区：[1]南昌大学工程建设学院,南昌330031 [2]江西省交通科学研究院有限公司,南昌330052 [3]哈尔滨工业大学交通科学与工程学院,哈尔滨150090

出　　处：《材料导报》2024年第14期93-104,共12页Materials Reports

基　　金：国家自然科学基金(52168062);2021年度江西省博士后研究人员科研择优资助项目。

摘　　要：自愈合技术在延长沥青路面使用寿命方面有着巨大优势。明晰沥青材料的自愈合行为发展和提升其自愈合性能是将它应用于实际工程的前提。微波加热是加速具有吸波性的沥青材料微裂纹愈合的有效方法,本工作以碳化硅为吸波剂制备粉胶比为0.9的自愈合沥青胶浆,提升沥青胶浆的吸波性能和路用性能,通过微观观察分析碳化硅掺入对沥青流变学性能、力学性能和自愈合性能的影响,以及在微波辐照下沥青胶浆的升温情况。结果表明,沥青胶浆的自愈合起始温度、自愈合最佳温度及表面弹性模量都随碳化硅替换比例增大而呈现“双峰曲线”变化,这归因于碳化硅-石灰岩矿粉复合填料的级配变化所形成的不同界面结构使得沥青胶浆的性能发生变化。基于上述性能指标,提出了最佳碳化硅体积替换比例为40%。此外,微波测试也表明最佳替换掺量为40%(体积分数,下同)。综合路用性能及自愈合性能,在粉胶比为0.9的条件下,碳化硅最佳替换掺量为40%,研究结果可为碳化硅吸波沥青材料的开发设计提供理论参考。Self-healing technology has great advantages in prolonging the service life of asphalt pavement.Understanding the development of the self-healing behavior of bituminous material and enhancingits self-healing capacity are the prerequisite for its application in engineering.Microwave heating is an effective method for accelerating the healing of cracks in wave-absorbing asphalt materials.In this work,silicon carbide was used as the absorbing material to prepare self-healing asphalt mastic with filler-bitumen ratio of 0.9,which can improve the absorbing property and road performance of asphalt mastic.The effects of silicon carbide on rheological,mechanical and self-healing properties of asphalt were analyzed microscopically,and the heating behavior under microwave irradiation.The results show that the initial temperature of self-healing,the optimum temperature of self-healing and the elastic modulus of asphalt mastic show a‘bimodal curve’with the increase of silicon carbide replacement ratio.The reason for this is the change in particle gradation of the silicon carbide-limestone powder composite filler,which forms a different interfacial structure resulting in a change in the properties of the asphalt mastic.Based on the above parameters,the optimal volume replacement ratio of 40%is proposed.In addition,microwave test also shows that the optimal replacement dosage is 40vol%.Under the filler-bitumen ratio of 0.9,considering the road performance and self-healing property,the optimal replacement dosage of silicon is 40vol%.The results can provide theoretical reference for the development and design of silicon carbide absorbing asphalt material.

关 键 词：沥青胶浆 自愈合 碳化硅 微波加热 微观机理 

分 类 号：U414[交通运输工程—道路与铁道工程]