The influence of RAP fine treatment process equipment and process parameters on particle morphology
ZHANG Wenwu
FAN Xiuze
HU Xueliang
HU Wei
WANG Shanshan
ZHANG Jizhe
YAO Zhanyong
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：RAPfine treatmentmultiscale evaluation systemneedle-like indexsphericityangularity gradienttexture index
Publication Date：2025-03-29
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：8( 53-60 )