沥青混合料裂缝自愈合修复技术

Crack Self-healing Repair Technology of Asphalt Mixture

综合国内外最新研究成果对沥青混合料自愈合修复技术展开了全面地分析,介绍了沥青自愈的机理、沥青自愈合行为特征,综述了引入间歇期与环境温度的前提下沥青材料随时间自然愈合的相关研究。介绍了以升高温度来促进沥青自愈的感应加热技术、以再生剂辅助沥青自愈的微胶囊技术。添加微胶囊的沥青混凝土在产生裂缝时释放出胶囊内的再生剂,自愈效率快,但其成本高昂、技术要求高且只具备一次愈合功效。感应加热技术向沥青混凝土内添加导电纤维(如钢丝绒)并直接对沥青加热,愈合迅速且能够多次修复,相对于微胶囊技术具有较低的技术要求,具有更好的实用前景和价值,但仍需对该复合材料的力学性能、温度变化速率以及感应加热时机等方面进行研究。

Based on the recent research results both in China and abroad, this paper gives an overall analysis of the self-healing repair technology of asphalt mixture, and introduces the mechanism and behavior characteristics of asphalt self-healing. It summarizes the studies that asphalt materials naturally heal itself in time with different intermission and different environmental temperature. Induction heating which raises the temperature to improve self-healing and microcapsule technology which utilizes the rejuvenation agent to assist self-healing are introduced in this paper. The asphalt concrete with microcapsules releases rejuvenation agent when cracking. This technology has a high efficiency, but it＇s expensive, complex, and it works only once. Induction heating adds conductive fibers into asphalt concrete （steel wool）, so the asphalt binder is directly heated. It heals the asphalt concrete quickly and can be repeated several times. When compared with microeapsule, induction heating has a low-level technical demand, so it has better practical foreground and value. For this kind of composite material, it needs to be studied more about its mechanical property, temperature rate of change and the optimum moment to be repaired.