不同形状假设下沥青混凝土级配快速识别效果对比

Comparative analysis on the fast recognized gradation of asphalt concrete under different shape assumptions

为提高沥青混凝土级配识别的精度,采用数字图像处理技术对沥青混凝土的平面级配进行统计分析,利用数值算法获得不同形状颗粒剖切后截面尺寸分布概率。对沥青混凝土的平面级配进行体视学转换,识别出沥青混凝土的三维真实级配,并对推测级配进行试验验证。研究结果表明:集料假设的形状不同,剖切后的截面尺寸分布概率也各不相同。采用椭球形集料假设进行体视学转换可以准确推测沥青混凝土的真实级配,避免对识别结果进行二次修正。集料的形状假设对体视学转化结果具有显著影响,建议在对平面级配进行体视学转换时采用椭球形集料假设,同时此方法亦可用于其他复合材料内部组成的定量推测。

In order to improve the recognized accuracy of gradation for asphalt concrete,the digital image processing technique was used to analyze the planar gradation statistically.The distributed probabilities of cross-section size for different particles were obtained using a numerical method.The planar gradation of asphalt concrete was converted by stereological method,a real three dimensional gradation of asphalt concrete was recognized finally,and the estimated gradation was verified with experiments.The results show that the distributed probabilities of cross-section size are different if the aggregates are assumed as different shapes.The real gradation of asphalt concrete can be estimated accurately by stereological conversion based on the assumption of ellipsoidal aggregate,this result of gradation doesn't need to be corrected once again.When the stereological conversion is conducted,the assumed shape of aggregate has a significant impact on the converted results.It is recommended that the assumption of ellipsoidal aggregate be used for the stereological conversion on planar gradation.This method can also be used to evaluate the internal composition quantitative for other composite materials.