RAP chunks produced in cold milling operation of asphalt pavement: Evaluation, mechanism, and engineering investigation in China

IF 7.4 2区 工程技术 Q1 ENGINEERING, CIVIL
Yuquan Yao , Jiangang Yang , Jie Gao , Mulian Zheng , Liang Song , Jing Xu , Chen Sun
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Abstract

Cold milling is a widely used method for rehabilitating asphalt pavement, generating reclaimed asphalt pavement (RAP) chunks. Within this process, aggregates within the asphalt pavement will be crushed, forming RAP agglomerates and aggregate breakdown. However, the mechanism of these phenomena has remained unclear, and a unified evaluation method has yet to be established. In this study, RAP agglomeration and aggregate fragmentation were characterized, five distinct methods were systematically assessed, and the mechanism of RAP agglomeration and breakdown was analyzed by discrete element method (DEM) simulation based on setting different particle contact parameters, then followed by a mechanical analysis, and demonstrated in engineering. The results revealed that both agglomeration and aggregate breakdown occur within RAP particles of various sizes, with the five methods showing similar trends in quantifying these effects. Through DEM simulations and mechanical analyses, the aggregate breakdown predominantly occurs at the cutter's motion trajectory of the cutter and during crack propagation, while agglomeration was mainly related to the sliding surface's area. The milling speed and depth positively impact RAP agglomeration, while negatively affecting aggregate breakdown, and milling drum speed exerts minimal influence on these phenomena. RAP agglomeration varies considerably in different engineering projects, and cold milling parameters should be determined based on the material composition of the asphalt pavement and design requirements to control agglomeration and breakdown rates of RAP.
沥青路面冷铣刨机作业中产生的 RAP 块:中国的评估、机理和工程研究
冷铣刨机是一种广泛使用的修复沥青路面的方法,可产生再生沥青路面(RAP)大块。在此过程中,沥青路面中的集料会被压碎,形成 RAP 团块和集料破碎。然而,这些现象的机理尚不清楚,统一的评估方法也尚未建立。本研究对 RAP 结团和集料破碎进行了表征,系统地评估了五种不同的方法,并在设置不同颗粒接触参数的基础上,通过离散元法(DEM)模拟分析了 RAP 结团和集料破碎的机理,然后进行了力学分析,并在工程中进行了演示。结果表明,在不同大小的 RAP 颗粒中都会发生团聚和聚合破裂,五种方法在量化这些效应方面表现出相似的趋势。通过 DEM 模拟和力学分析,骨料破碎主要发生在铣刀的运动轨迹和裂纹扩展过程中,而聚结主要与滑动面的面积有关。铣削速度和深度对 RAP 结块产生积极影响,而对骨料破碎产生消极影响,铣削滚筒速度对这些现象的影响很小。在不同的工程项目中,RAP 的结块情况差异很大,应根据沥青路面的材料组成和设计要求确定冷铣刨机参数,以控制 RAP 的结块和破碎率。
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来源期刊
CiteScore
13.60
自引率
6.30%
发文量
402
审稿时长
15 weeks
期刊介绍: The Journal of Traffic and Transportation Engineering (English Edition) serves as a renowned academic platform facilitating the exchange and exploration of innovative ideas in the realm of transportation. Our journal aims to foster theoretical and experimental research in transportation and welcomes the submission of exceptional peer-reviewed papers on engineering, planning, management, and information technology. We are dedicated to expediting the peer review process and ensuring timely publication of top-notch research in this field.
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