Study of movement of coarse aggregates in the formation process of asphalt mixture in the laboratory
Study of movement of coarse aggregates in the formation process of asphalt mixture in the laboratory
复制标题
沥青混合料形成过程中粗集料运动的实验室研究
DOI：
10.1016/j.conbuildmat.2016.02.110
复制
发表时间：
2016-05-15
影响因子：
7.4
通讯作者：
Shang, Min
中科院分区：
文献类型：
--
作者：
Guo, Hui;Zhao, Yongli;Shang, Min
在本文中，试图建立一个关于长度、宽度和厚度的等效球体数学模型，以描述实验室沥青混合料的粗集料。根据长度、宽度和厚度分别计算出的直径值与利用二维数字图像处理技术得到的模型实际值进行了对比。在形成过程中观察到某些运动特征。结果表明：随着压实时间的增加，二维粗集料的平均粒径及其标准差增大；这表明，随着压实时间的延长，粗集料的旋转量增加，其较好的充填效果也随之增加。结果还表明，在压实40 ~ 60次之间，粗集料可能有相当大的破碎。(C) 2016 Elsevier Ltd.版权所有。
In this paper, attempts have been made to build an equivalent-sphere mathematical model with respect to length, width, and thickness, in order to describe the coarse aggregates of asphalt mixture in the laboratory. The values of diameters calculated separately based on lengths, widths, and thicknesses have been compared to the model with actual values, which were obtained by two-dimensional digital image processing technique. Certain characteristics of movements were observed during the formation process. The results indicate that an increase of compaction time is accompanied by an increase in average diameter of 2D coarse aggregates and its standard deviation. This shows that the rotations of the coarse aggregates and their better packing effect increase with compaction time. The results also imply that there may be a considerable breaking of coarse aggregates between compaction of 40 and 60 times. (C) 2016 Elsevier Ltd. All rights reserved.