不同压实成型沥青混合料的数字图像分析

针对沥青混合料试件压实成型方式不同因而内部结构各异的情况,采用图像数字处理技术,借助于CCD(电荷耦合器件)相机获取试件立断面的数字化信息,提出利用颗粒主轴方向、沥青砂胶膜厚及颗粒面积比等压实参数,直观、快速而准确地评价不同成型方法的压实效果,在此基础上,选择了马歇尔击实、轮碾压实、振动压实和旋转压实四种方法进行研究,并对比分析了实际路面结构。结果表明,轮碾压实和旋转压实效果与实际路面最接近,新建路面在开放交通初期仍在不断密实。

DIGITAL IMAGE ANALYSIS OF COMPACTED ASPHALT MIXTURE WITH DIFFERENT MEANS

According to the asphalt mixture specimens are formed with different compacting means, hence its internal structures are different, thus an asphalt mixture digital image processing technique is used.With the aid of the (Charge- Coupled Device) CCD camera to acquire the digital informations for erect section of specimens, then utilizing the compacting parameters of compaction particle principal axis direction, asphalt mastics film thickness and particle area ratio etc., to evaluate the compacted effects under different forming means directly and exactly are put forward. On these bases, selecting four compacting means including the Marshall compaction, the rolling compaction, the vibrating compaction and the gyratory compaction are studied and compared with the practical pavement structures. The results show that the compacting effects of rolling - compacted and gyratory - compacted specimens are most closely with the practical pavement, which will still compacting unceasingly in early days of open to traffic.