路用高性能橡胶沥青复合材料研究进展

A review of high-performance rubberized asphalt composite materials for pavement

  • 摘要: 沥青路面是以石料为骨架、沥青胶浆为黏结连续相的典型大宗复合材料。低温或温缩会引起沥青路面开裂,老化更加剧开裂,这一直限制路面服役水平的提高。基于日益增多的废轮胎橡胶开发的高性能橡胶沥青可大大减少路面开裂,而因橡胶交联网在筑路过程中的演化导致胶粉与沥青混合料多尺度非平衡适配,致使路用高性能橡胶沥青的发展难以达成共识。本文首先基于橡胶沥青的发展进程,从结构-性能构效关系出发,回顾了橡胶沥青从现场法、工厂化法到高性能化的发展历程,探讨了橡胶的化学结构、相结构及其与沥青混合料的多尺度适配性。接着从高低温性能、韧性、耐老化、自愈合和抗水损性能等方面探讨了高性能橡胶沥青的性能优势,并提炼了高性能化机制。最后,概述了高性能橡胶沥青在新建路面和养护路面中的应用价值,并针对“白改黑”过程中的反射裂缝问题,提出了仿轮胎结构的材料结构一体化复合材料的防开裂路面养护方案,旨在推动退役轮胎在公路中的绿色高值化循环利用。

     

    Abstract: Asphalt pavement is a typical bulk composite material characterized by a stone aggregate skeleton and a continuous asphalt mastic phase. Low-temperature or thermal-shrinkage often cause the cracks of pavement, and aging further accelerates the cracks, which has limited the improvement of pavement service levels. High-performance rubberized asphalt developed from the growing volume of ground tire rubber can greatly reduce pavement cracking. However, the evolution of the rubber crosslinking network during processing leads to the unbalanced incompatibility of crumb tire rubber with asphalt mixture in multiscale, which has resulted in different opinions on the high-performance rubberized asphalt for pavement applications. Firstly, based on the advancements of rubberized asphalt and its structure-performance relationship, the development of rubberized asphalt technology was systematically reviewed in terms of processing in field, factory and with high-performance methods. The chemical structure and phase structure of rubber, along with its scale compatibility with asphalt mixtures were also examined. Subsequently, the fundamental properties contributing to the extended service life of high-performance rubberized asphalt were explored, including its high- and low-temperature performance, toughness, aging resistance, self-healing ability and water damage resistance. The high-performance mechanisms were further elucidated. Finally, the value of high-performance rubberized asphalt applied in the construction and maintenance of pavement was summarized. To address the issue of reflective cracking during the “white-to-black” construction, a crack-resistant pavement maintenance solution integrating material and structural design, inspired by the tire structure, was proposed. The purpose of this review is to further promote the green and high-value recycling of end-of-life tires in highway.

     

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