沥青混凝土感应加热自愈合理论与愈合效果调控方法研究

Induction heating activated self-healing of asphalt concrete can effectively close the cracks of asphalt concrete, thus being a promising advanced cracking maintenance technology for asphalt pavement. This project will investigate the design method of efficient heating based self-healing asphalt concrete and explore the healing theory and healing adjustment method for different asphalt mixtures. The effect of the gradation, bitumen content, characteristics and contents of conductive additives on the road performance and self-healing properties of asphalt mixtures will be studied. The compatibility and coordination effect of different conductive additives will be studied and the characteristics and contents of conductive additives will be optimized to develop a proper design method of efficient heating based self-healing asphalt concrete. The self-healing rates of different asphalt mixtures with different ageing extents, crack sizes, heating temperatures, bitumen contents and gradations will be investigated the relationship between the self-healing property and the above parameters will be explored, thus establishing a self-healing theory for different asphalt mixtures. The adjustment method of induction healing properties of asphalt mixtures will be studied as well, and the optimal parameters will be recommended for induction healing asphalt mixtures. The threshold healing temperature theory and healing adjustment method developed in this research will provide a theoretical basis for the optimization and application of induction healing technology of asphalt concrete.

感应加热自愈合可有效修复沥青混凝土中的微裂纹，有望成为先进的沥青路面预养护技术。本项目拟提出高感应加热速率自愈合沥青混凝土的设计方法，建立其感应加热自愈合理论，掌握其愈合效果调控方法。研究级配类型、沥青含量和性能、导电相材料的形状特征和掺量等因素对沥青混凝土路用性能及感应加热速率的影响规律，分析不同导电相材料的配伍性与协同效应、优化其特征参数与掺配比例，提出具有优良路用性能和高感应加热速率的自愈合沥青混凝土的设计方法。研究裂纹尺寸、感应加热温度及其梯度、沥青含量与性能、级配类型等因素耦合作用下沥青混凝土自愈合性能的变化规律，揭示沥青混凝土的感应加热自愈合性能与上述参数之间的内在关系，建立沥青混凝土的感应加热自愈合理论。研究沥青混凝土感应加热自愈合效果的调控方法，提出沥青混凝土感应加热自愈合的最佳愈合参数，为沥青混凝土感应加热自愈合技术的优化和应用提供科学依据。

感应加热自愈合可快速修复沥青混凝土中的微裂纹，有望成为先进的沥青路面预养护技术，但沥青混凝土的感应加热速率有限，亟需通过科学设计提升其感应加热速率，同时也需厘清沥青混凝土的愈合效果与感应加热参数之间的内在关系以提升愈合效果。经过四年研究，本项目建立了多相复合高感应加热速率沥青混凝土的设计方法，利用钢渣钢砂钢棉纤维多相导电材料复合制备出了路用性能优良、感应加热速率高的沥青混凝土，探明了沥青混凝土不同工况下感应加热自愈合性能的变化规律，揭示了沥青混凝土的感应加热自愈合效果与沥青种类和性能、感应加热温度和梯度、沥青老化等参数之间的内在关系，建立了沥青混凝土的感应加热自愈合模型，实现了对其愈合效果的准确模拟和预测，同时形成了沥青混凝土感应加热自愈合效果的调控方法，提出了沥青混凝土感应加热自愈合的最佳愈合参数，研究成果可为沥青混凝土感应加热自愈合技术的优化和应用提供科学依据。