【摘要】 微波加热作为一种全新的体积加热形式,因其快速、均匀和节能的加热特性,已广泛应用于食品、陶瓷等行业,但在道路早期养护领域尚处于探索研究阶段。本研究归纳了基于微波加热的沥青混合料自愈合性能研究进展,针对沥青材料自愈合理论、微波加热机理、微波加热材料、微波加热沥青混合料自愈合影响因素等方面研究现状进行了总结。综述分析表明:由于沥青成分、微观结构以及复杂的相互作用,沥青材料的愈合机制尚未完全清楚,但裂缝表面分子扩散理论、裂缝表面能理论和毛细流动理论在一定的限定条件下能够很好地表征沥青材料的自愈合特性;微波加热是一种高效、环保的沥青混合料自愈合热诱导形式,通过掺入钢屑、钢渣、炭黑、铁素体颗粒等微波加热材料,可提高沥青混合料的自愈合性能;沥青混合料的自愈合性能受到微波特性、沥青性能及沥青混合料类型、外部环境等因素的共同影响,外部环境对沥青混合料自愈合性能的影响最为显著,当超过最佳加热时间、含水率过高、损伤程度较大时,沥青混合料的自愈合性能显著下降。最后,从实际工程的角度,分析了微波加热沥青混合料自愈合性能工程应用面临的问题,并展望了其应用前景。更多还原

【Abstract】 As a new volume heating form, microwave heating has been widely used in food, ceramics and other industries because of its fast, uniform and energy-saving heating characteristics; however, it is still in the exploration and research stage in the field of early road maintenance. This paper summarizes the research progress of asphalt mixture self-healing performance based on microwave heating, and summarizes the research status of self-healing theory of asphalt materials, microwave heating mechanism, microwave heating materials, and influencing factors of asphalt mixture self-healing. The summary and analysis show that due to the asphalt composition, microstructure and complex interactions, the healing mechanism of asphalt materials is not yet completely clear; however, the crack surface molecular diffusion theory, crack surface energy theory and capillary flow theory are able to characterize the self-healing properties of asphalt materials very well under certain limiting conditions. The microwave heating is an efficient and environmental friendly self-healing heat induction form of asphalt mixture. The self-healing performance of asphalt mixture can be improved by adding steel chips, steel slag, carbon black, ferrite particles and other microwave heating absorbing materials. The self-healing performance of asphalt mixture is affected by microwave characteristics,asphalt performance, asphalt mixture type, external environment and other factors. The external environment has the most significant effect on the self-healing properties of asphalt mixture. The self-healing performance of asphalt mixture significantly decreases when the optimal heating time exceeds. The water content is too high and the damage degree is large. Finally, from the perspective of practical engineering, the problems faced by engineering application of microwave heating asphalt mixture self-healing performance were analyzed, and its application prospects were prospected.更多还原