不同拌和速度下再生沥青混合料均匀性演变模拟研究

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中图分类号：U416.26 文献标志码：A

本文引用格式：，等.不同拌和速度再生沥青混合料均匀性演变模拟研究[J].华东交通大学学报，2025，42（2）：76-86.

Simulation Study on the Evolution of Uniformity of Reclaimed Asphalt Pavement with Different Mixing Speeds

Wu Jiantao，Liu Jinpeng，Han Yuting， Liu Quan （CollegeofCivilandTransportationEngineering，Hohai University，Nanjing21oo98，China）

Abstract： In order to beter grasp the changes in the mixing uniformity of reclaimed asphalt pavement （RAP）， the dynamic process of the evolution ofRAP mixing uniformity at diferent mixing speeds was simulated. Firstly，based on the discrete element method （DEM） to simulate the RAP mixing process under different mixing speeds，we analyze the mixing uniformity change and internal mechanism of the old aggregate agglomeration crushing; Secondly，on the basis of agglomerate crushing， we further analyze the uniformity evolution process of the new and old aggregates; Finally， we use the 3D printing technologyand image processing toanalyze the mixinguniformity change of the new and old aggregates in the chamber under diferent mixing speeds.There is a process of agglomerate crushing from fast to slow，The inflection times of the fitted curves of dispersion factors of old aggregate agglomeration at 5，10，15， 20r/min mixing speeds are 10.92， 6.69， 5.48，4.12 s，respectively. the further the agglomerates are away from the center of mixing，the more obvious the trend of speed and force changes in mixing，and the more homogeneous the mixing is.The inflection times of the fited curves of dispersion factors of old and new aggregatesat 5，10，15， 20r/min mixing speeds are 17.05，8.74，5.66，4.26 s，respectively.The uniformityof the mixing of the old and new aggregates under diferent mixing speeds isslightly different between the indoor experiment and DEM，but allof them reach the inflection point of uniformity around 4 s.The change of mixing uniformity ofRAP is a complex dynamic processand the mixing speed is a key factor that cannot be ignored to affect the mixing uniformity.

Key Words： mixing uniformity; mixing speed; reclaimed asphalt pavement; discrete element method; old aggregate agglomeration; 3D printing

Citation format：WUJT，LIU JP，HANY T，etal. Simulation studyon the evolutionof uniformityof reclaimed asphalt pavement with different mixing speeds[J].Journal ofEast China Jiaotong University，2025，42 （2）： 76-86.

再生沥青混合料（reclaimedasphaltpavement，RAP）能够实现废旧沥青路面重复利用，并更好地保护环境[1-4]。（剩余14889字）