胶粉应用于沥青改性技术的发展综述

橡胶沥青作为一种环保型路面材料，在过去几十年里已经得到了广泛的应用。为进一步推动、推广橡胶沥青及橡胶沥青混合料的应用，掌握其发展现状并梳理发展需求，系统汇总了胶粉应用于沥青改性技术中的指标要求、制备工艺、性能评价与工程难题。首先，回顾了国内外胶粉应用于沥青改性技术的发展历程，并对国内外相关技术规范中胶粉的相关物理技术指标要求进行了总结分析。其次，以1.0 mm为粒径界限，对比分析了胶粉在沥青和沥青混合料中的干法工艺和湿法工艺，揭示了胶粉在沥青中的改性机理，包括沥青胶体结构变化、胶粉颗粒体积溶胀、胶粉颗粒脱硫和降解。进而，围绕胶粉粒径、胶粉掺量等胶粉材料组成特点，总结归纳了其对沥青及沥青混合料路用性能的影响。最后，阐述了主要由胶粉和橡胶沥青自身物理性质所导致的工程应用中的常见难点问题及对应解决措施，包括高质量胶粉供应渠道与加工处理问题、橡胶沥青高温贮存稳定性差问题、橡胶沥青及其混合料高温拌合与施工及其能耗和排放问题等。

Development of Using Crumb Rubber in Asphalt Modification: A Review

In recent decades, crumb rubber has been widely used as a sustainable and recycled material in road construction. To further promote the use of crumb rubber binder/rubber asphalt mixtures in road applications, overview its development, and investigate the requirements of using this material, this study reviewed the development, manufacture, performance, and impediments of using crumb rubber in asphalt modification. First, the development of crumb rubber binders abroad and in China was reviewed, along with the criteria of crumb rubber materials in related national/state specifications for crumb rubber binder/rubber asphalt mixtures. Then, the methods of incorporating crumb rubber into binder/mixtures were illustrated, including the dry(retained in a 1.0 mm sieve) and wet(pass through a 1.0 mm sieve) processes. The interaction reaction between crumb rubber particles and base asphalt binder was summarized. According to the literature, the effects of crumb rubber characteristics (such as crumb rubber particle sizes and crumb rubber contents) on the performance of crumb rubber binder/rubber asphalt mixtures were summarized. Finally, the impediments of using crumb rubber binder/rubber asphalt mixtures were discussed with solutions accordingly.