沥青混凝土疲劳损伤自愈合行为研究进展(5)——沥青自愈合微胶囊

Review on Self-healing Behavior of Asphalt Concrete(5)——Micro-capsules for Self-healing Asphalt

沥青自愈合微胶囊是一种将可流动黏结剂包埋、封存在聚合物薄膜内而形成的微小囊状粒子。当沥青材料出现裂缝后可引发微胶囊囊壁开裂并释放芯材,进而促进裂缝快速愈合。分析了微胶囊对沥青自愈合能力强化作用机理和效果,总结了沥青自愈合微胶囊制备方法,重点探讨了原位聚合法合成微胶囊工艺参数对微胶囊粒径、囊壁厚度、表面形态、高温性能以及强度等性质的影响,并提出控制释放技术是沥青自愈合微胶囊研究发展方向。

Micro - capsules for self - healing asphalt are tiny particles containing liquid adhesive as core material surrounded by a polymer coating or a shell. When cracks occurred in asphalt materials, the micro - capsules crazed and the adhesive was released, then the adhesive entered the asphalt by diffusion to accelerate the healing of crack. In this article, the mechanism and effects of how micro - capsules enhanced the self - healing behavior of asphalt materials was analyzed. Two ways to synthesize capsules/micro - capsules were in- troduced as well. This article put emphasis on how the process parameters of in - situ polymerization influence the size, shell thickness, morphology, thermal stability, and mechanical properties of micro - capsules. Final- ly, a new micro- capsule technique, magnetic micro -capsules with controlled release properties, was presented, which may have a bright future if this techs is successfully applied in asphalt self - healing field.