Study on the Degree of Blending and Diffusion Homogenisation of Virgin and Reclaimed Asphalt via Confocal Laser Scanning Microscopy
ZOU Guilian1, JIAO Youqing1, ZHANG Yuan1,*, YU Jiangmiao1, HAN Ao2
1 School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China 2 Shanghai Municipal Engineering Design and Research Institute Group Foshan Co., Ltd., Foshan 528000, Guangdong, China
Abstract: The degree of blending of virgin and reclaimed asphalt in the recycling process of recycled asphalt mixtures directly affects the performance of the mixtures. To address the problem of difficulty in characterising the degree of blending of virgin and reclaimed asphalt in hot recycled mixtures, the degree of blending of virgin and reclaimed asphalt in the process of hot recycled was investigated using confocal laser scanning microscopy in this work. Using SBS modified asphalt in the confocal laser scanning microscopic image of the red fluorescence effect, SBS fluorescent particles were employed to trace. Based on the confocal laser scanning microscopy, all the images within the surface blending layer of the recycled asphalt mixture after mixing were non-destructively acquire, and then the fluorescence intensity analysis of each layered image was conducted to obtain the concentration of SBS modified asphalt within the entire blending layer decay curve. The formula for calculating the degree of blending was proposed through the concentration change curve, and the homogenisation index was introduced to quantify the degree of diffusion homogenisation of the virgin and reclaimed asphalt in the recycled asphalt mixtures. The proposed method was exemplarily used to calculate two different blending ratios of hot recycled mixtures, showing that the virgin and reclaimed asphalt could not reach the ideal blending and diffusion state only at the end of the mixing.
邹桂莲, 焦有晴, 张园, 虞将苗, 韩骜. 基于激光共聚焦扫描显微镜的新旧沥青融合及均质化程度研究[J]. 材料导报, 2025, 39(5): 24010257-6.
ZOU Guilian, JIAO Youqing, ZHANG Yuan, YU Jiangmiao, HAN Ao. Study on the Degree of Blending and Diffusion Homogenisation of Virgin and Reclaimed Asphalt via Confocal Laser Scanning Microscopy. Materials Reports, 2025, 39(5): 24010257-6.
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2025, Vol. 39 
