乳化沥青冷再生路面研究进展:材料特性、组成设计及性能评价  

Advance in Cold Recycling Pavement by Emulsified Asphalt:Materials Property,Composition Design and Performance Evaluation

作　　者：虞将苗 冯致皓 陈富达 于华洋 YU Jiangmiao;FENG Zhihao;CHEN Fuda;YU Huayang(School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510641,China;State Key Laboratory of Subtropical Building and Urban Science,Guangzhou 510641,China;Central Fortune Creation Technology Group Co.,Ltd.,Foshan 528200,Guangdong,China)

机构地区：[1]华南理工大学土木与交通学院,广州510641 [2]亚热带建筑与城市科学全国重点实验室,广州510641 [3]华运通达科技集团有限公司,广东佛山528200

出　　处：《材料导报》2024年第22期1-10,共10页Materials Reports

基　　金：国家自然科学基金(52178426);中央高校基本科研业务费专项资金(2022ZYGXZR066,2023ZYGXZR001);佛山市科技创新团队专项(2120001010776);广东省自然科学基金(2023A1515030287)。

摘　　要：乳化沥青冷再生技术在常温下利用沥青路面回收料,实现节能减排、资源集约和可持续发展目标,是目前的热门绿色低碳道路建设技术之一。目前工程中回收料利用率一般低于40%,加之冷再生材料早期强度形成慢、初期强度不足,显著影响其性能与工程应用。如何提高回收料利用率、加速早期强度形成成为研究的关键问题。目前研究主要包括材料特性、组成设计和性能评价三大主要方向。在材料方面,道路回收料主要聚焦表面老化沥青活性、颗粒特性、再生剂使用后组分变化等细微观研究,尚未实现工程中道路回收料的高掺量大规模应用;乳化沥青的改性类型、黏度、用量能显著改善冷再生混合料的力学与路用性能,乳化沥青的固化进程决定冷再生混合料强度形成速度。在组成设计方面,回收料级配显著影响材料骨架结构和性能,目前聚焦关键孔径作用、级配改善、材料体积指标等方面的研究,同时现行主流材料成型方法与实际工程存在较大差异,旋转压实法更为贴近实际工程状态,但在旋转参数、成型指标等方面尚未形成统一定论。在性能方面,道路回收料的使用提高了冷再生混合料的高温性能和低频率作用下的疲劳性能,但水泥的使用增强了材料的低温脆性,沥青性能满足使用需求时,应当降低水泥掺量。此外,目前在早期强度形成机理、改善手段方面的研究不足,应加强乳化沥青冷再生混合料早期性能研究,以提高工程建设效率。Emulsified cold recycled asphaltmixture plays a crucial role in achieving energy saving,emission reduction,resource intensification,and sustainable development goals by utilizing reclaimed asphalt pavement materials at room temperature.It has emerged as a prominent low-carbon road construction technology.However,the utilization rate of reclaimed materials remains below 40%,mainly due to challenges such as slow strength formation and low initial strength.Enhancing the utilization and accelerating early strength formation are key research areas in emulsified cold recycled asphalt technology.Researches are focused on three main directions:material properties,composition design,and performance evaluation.Aged asphalt activity,particle characteristics,and regenerants are critical aspects of reclaimed asphalt pavement.Despite the potential benefits,the high dosage of recycled materials has not yet seen widespread application.Modification of asphalt type,viscosity,and dosages can significantly enhance the mechanical strength and road performance of cold recycled mixtures.The curing process of modified asphalt influences the speed of strength formation.In composition design,gradation plays a vital role in the performance of the skeleton structure.Key size of particles,gradation improvement,and volume indicators are key considerations.Differences in molding methods between indoor and field projects exist,with gyratory compaction being closer to actual conditions.However,consensus on parameters and molding indexes is lacking.The use of reclaimed materials improves high-temperature and fatigue performance of mixtures,while cement enhances low-temperature brittleness.The dosage of cement should be adjusted to meet performance requirements.Furthermore,there is currently insufficient understanding of the mechanism of early strength formation and methods for improvement.Research on the early performance of emulsified asphalt cold recycled mixtures should be enhanced to increase the efficiency of engineering construction.

关 键 词：路面工程 冷再生 沥青路面回收料(RAP) 乳化沥青 材料特性 组成设计 性能评价 

分 类 号：U414[交通运输工程—道路与铁道工程]