不同成型方法和级配的沥青混合料内部空隙特征

发布时间：2018-09-04 08:25

【摘要】：采用X-ray CT技术和数字图像处理技术研究两种成型条件下三种级配沥青混合料试件的内部空隙特征,并通过统计分析提出数学模型对其进行表征。结果表明,沥青混合料的空隙空间分布规律受试件成型方法及级配类型的影响较大。不同级配条件下,马歇尔试件内部空隙率分布沿着高度方向总体呈现对称形状,而静压试件内部空隙率分布则为"一端大,一端小"的形状,马歇尔试件的平均空隙率与目标空隙率差异较小,而静压试件的平均空隙率是目标空隙率的1.4倍以上;相同级配条件下,与马歇尔试件相比,静压试件的空隙空间分布离散性、平均空隙率和平均空隙数量均较大,但平均空隙等效直径相差较小;采用两参数数学模型能够较好地表征成型方法和集料级配对沥青混合料内部空隙空间分布规律的影响。
[Abstract]:X-ray CT and digital image processing techniques were used to study the internal void characteristics of three graded asphalt mixture specimens under two kinds of forming conditions, and a mathematical model was proposed to characterize them by statistical analysis. The results show that the distribution of void space of asphalt mixture is greatly affected by the molding method and gradation type of the test piece. Under different gradation conditions, the internal porosity distribution of Marshall specimen presents symmetrical shape along the direction of height, while that of static pressure specimen is "one end is large and one end is small". The difference between the average porosity of Marshall specimen and that of target is small, while the average porosity of static pressure specimen is more than 1.4 times of that of target, and under the same gradation condition, the distribution of void space of static compression specimen is more discrete than that of Marshall specimen. The average porosity and the average number of voids are large, but the difference of the average void equivalent diameter is small. The two-parameter mathematical model can better characterize the influence of molding method and aggregate gradation on the distribution of internal void space in asphalt mixture.
【作者单位】：大连海事大学道路与桥梁工程研究所;辽宁省公路工程重点实验室;哈尔滨工业大学交通科学与工程学院;
【基金】：“十一五”国家科技支撑计划项目(2008BAG10B02) 高等学校博士学科点专项科研基金项目(20092125120005) 中央高校基本科研业务费专项项目(2011QN136,2012TD015)
【分类号】：U414

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