基于图像处理技术的沥青混合料细观压实特性研究  

Research on Microscopic Compaction Characteristics of Asphalt Mixture Based on Image Processing Technology

作　　者：张升 ZHANG Sheng(China Railway 19th Bureau Group 3rd Engineering Co.Ltd.,Shenyang Liaoning 110136,China)

机构地区：[1]中铁十九局集团第三工程有限公司,辽宁沈阳110136

出　　处：《铁道建筑技术》2025年第1期1-4,21,共5页Railway Construction Technology

基　　金：中铁十九局集团有限公司科技研究开发项目(23-Z02)。

摘　　要：本研究基于数字图像处理技术表征沥青混合料压实过程中细观结构的变化规律;联合黏度试验、旋转压实试验进一步分析细观压实特性与材料指标之间的关系;采用基于最小距离测量砂浆膜厚度的图像处理算法,对不同压实参数下的沥青砂浆细观指标及其变化规律进行了量化。发现在压实早期,压实次数的增加主要导致厚度大于3 mm的砂浆膜变薄;中间厚度(1.7~3 mm)砂浆膜的分布频率稳定至压实80次左右,然后明显降低;砂浆细观参数膜厚平均值(T_(m))和标准偏差(SD_t)随着压实次数的增加而下降,压实60次后,下降速度减缓;压实温度超过180℃后,温度对砂浆细观指标影响极小。对于SMA-13混合料,为达到最佳压实效果,建议控制SBS改性沥青黏度在380~460 mPa·s之间。This study uses digital image processing technology to characterize the mesostructural changes in asphalt mixtures during compaction.In combination with viscosity and gyratory compaction tests,the relationship between microscopic compaction characteristics and material properties was further analyzed.An image processing algorithm based on the minimum distance measurement of mortar film thickness was used to quantify the asphalt mortar microscopic indexes and its changing law under different compaction parameters.It is found that in the early stage of compaction,the increase in the number of compaction times mainly leads to the thinning of the mortar film with a thickness greater than 3 mm.The frequency of distribution of the intermediate thickness(1.7-3 mm)mortar film stabilizes up to about 80 gyrations and then decreases significantly.The mean(Tm)and standard deviation(SDt)of the film thickness of the mortar microscopic parameters decreases with the increase of the number of gyrations,and the decrease slows down after 60 gyrations.After the compaction temperature exceeded 180℃,the effect of temperature on the mortar microscopic indexes is minimal.For SMA-13 mixes,it is recommended to control the viscosity of SBS-modified asphalt between 380 and 460 mPa·s for optimum compaction.

关 键 词：沥青混合料压实 图像处理 沥青砂浆 黏度 

分 类 号：U414[交通运输工程—道路与铁道工程]