RAP精细化处置工艺设备和工艺参数对颗粒形态的影响规律

张文武¹，范秀泽²，胡学亮¹，胡巍³，王珊珊¹，张吉哲²，姚占勇²

1.山东高速集团，山东 济南  250098；2.山东大学齐鲁交通学院，山东 济南  250001；

3.滨州市交通运输综合执法支队，山东 滨州  256600

摘要：为改善沥青混合料回收料（reclaimed asphalt pavement，RAP）性能，提高RAP利用率，减少RAP精细化处置技术对集料颗粒形态的影响，研究再生集料颗粒形态的定量表征，采用三维扫描与集料图像测量系统（aggregate image measurement system, AIMS）测量相结合的技术手段，研究不同工艺参数对再生集料针片状指数、球度、梯度棱角性和纹理指数指标的影响规律，综合分析关键影响因素。结果表明：随主轴转速增大或处置时间延长，再生粗集料的梯度棱角性减小，纹理指数和球度增大。再生粗集料的针片状指数随主轴转速增大而减小，随处置时间的延长先减小后回升。提高主轴转速或延长处置时间，RAP针片状指数、球度、梯度棱角性和纹理指数的标准差均明显减小，表明精细化处置工艺可改善再生集料宏观-细观-微观形态特征的变异性。

关键词：RAP；精细化处置；多尺度评价体系；针片状指数；球度；梯度棱角性；纹理指数

The influence of RAP fine treatment process equipment and process parameters on particle morphology

ZHANG Wenwu¹, FAN Xiuze², HU Xueliang¹, HU Wei³, WANG Shanshan¹, ZHANG Jizhe², YAO Zhanyong²

1.Shandong Hi-Speed Group, Jinan 250098, China;

2.School of Qilu Transportation, Shandong University, Jinan 250001, China;

3.Binzhou Comprehensive Law Enforcement Branch of Transportation, Binzhou 256600, China

Abstract: To improve the performance of recycled asphalt pavement (RAP) and increase the utilization rate of RAP, while reducing the impact of fine processing technology on the particle morphology of aggregates, this study investigates the quantitative characterization of recycled aggregate particle morphology. A combination of three-dimensional scanning and the aggregate image measurement system (AIMS) is employed to study the influence of different process parameters on the needle-like index, sphericity, angularity gradient, and texture index of recycled aggregates, and to comprehensively analyze the key influencing factors. The results indicate that with an increase in spindle speed or extension of processing time, the angularity gradient of recycled coarse aggregates gradually decreases, while the texture index and sphericity gradually increase. The needle-like index of recycled coarse aggregates decreases with increasing spindle speed and initially decreases then gradually rebounds with the extension of processing time. Increasing the spindle speed or extending the processing time significantly reduces the standard deviations of the needle-like index, sphericity, angularity gradient, and texture index of RAP materials, indicating that the fine processing technology can improve the variability of the macro-meso-micro morphological characteristics of recycled aggregates.

Keywords:RAP; fine treatment; multiscale evaluation system; needle-like index; sphericity; angularity gradient; texture index