室内成型的沥青混合料粗集料排布的研究

为了定量地评价粗集料排布在室内沥青混合料成型过程中的变化规律,利用数字图像处理技术,提出一种评价沥青混合料粗集料排布的合成质心矩方法.选取常用AC20,SMA20型沥青混合料,以控制两种混合料旋转压实次数为条件制成成型试件,横向切割获取截面采集图像进行参数提取.分别计算二维累计筛余粗集料和二维分计筛余粗集料的合成质心矩.结果表明两种不同类型的沥青混合料粗集料合成质心矩随压实次数增加发生不同的变化,SMA20压实60次排布性已达到较好水平.

Study of Coarse Aggregate Configuration of Asphalt Mixture in Laboratory

In order to quantitatively evaluate the variation of the coarse aggregate alignment in the pitch mixture molding indoors， the digital image processing technology is used to propose a synthetic centroid moment method. The commonly used AC20 and SMA20 pitch mixtures are selected to define the number of rotations and compactions as test specimens of conditional molding for the two types of mixtures. Parameters are extracted through horizontal segmentation of the collected images. The synthetic centroid moments of the 2-D accumulate residual coarse aggregate and the 2-D non-accumulate residual coarse aggregate are computed， respectively. Results show that the synthetic centroid moments vary differently with the number of compactions for the two types of pitch mixture and coarse aggregate. The configuration of SMA20 is excellent after 60 compactions.