基于图像处理技术的磨耗层粗集料分布特性

为了给沥青路面磨耗层级配设计提供参考,基于体积法设计了不同骨架结构的沥青混合料。采用小型搓揉试验机开展室内试验,以模拟行车环境与车轮加速碾压效果。利用数字图像处理技术对不同衰减阶段的粗集料倾角进行分析,揭示粗集料空间分布状态对抗滑性能的影响。结果表明,磨耗层表面粗集料颗粒约65%比例以"平躺"状态为主,主要与碾压工艺有关;随着轮胎作用次数增加,粗集料颗粒从"竖立"状态往"平躺"状态发展;适当增加粗集料在4. 75 mm以上的比例,减少2. 36 mm细料的干涉,形成更强的主骨架约束,能有效降低沥青路面的二次压实,在一定程度上能够改善沥青磨耗层的耐久性。

Research on Distribution Characteristics of Wearing Course Based on Image Processing Technology

In order to provide reference for gradation optimization design of wearing course asphalt mixture, different skeleton dense structure asphalt mixtures were designed based on the volume method. Miniature kneading machine was used to carry out laboratory accelerated loading test, which can simulated the driving conditions and wheel rolling effect. The digital image processing technology was used to analyze the inclination angle of coarse aggregate in different attenuation stages, and the influence of the coarse aggregate spatial distribution state on the skid resistance performance was revealed. The results show that about 65% coarse aggregate particle of wearing course is in the "lie down" state, which is mainly related to the compaction technology. With the increase of tire load action times, coarse aggregate particles change from "erect" state to "lie down" state. By properly increasing the proportion of coarse aggregate above 4.75mm and reducing the interference of 2.36mm aggregate, a stronger main skeleton constraint can be formed and the secondary compaction of the mixture can be effectively reduced. It is concluded that skid resistance performance and durability of wearing course can be improved to a certain extent.