基于图像的粗集料形态对沥青面层抗剪性能的影响

由轮廓形状、棱角性和表面纹理量化的矿质集料的形态(形状特征)对沥青混合料的性能具有极为明显的影响.为研究粗集料形态对沥青面层抗剪性能的影响,将粗集料形态视为首要因素,定义了基于图像的粗集料形状参数,采用编制的图像处理程序,获取了五组颗粒形状特征不同的粗集料其形状参数,运用单轴贯入试验分析了粗集料形态参数对SAC_16混合料抗剪强度的影响.结果表明,粗集料各种形态参数对混合料抗剪强度都有不同程度的影响,且扁平比对抗剪强度的影响最大,必须控制粗集料中扁平颗粒的含量.

Influence of Coarse Aggregate Shape Characteristics on the Shearing Properties of Hot - Mix Asphalt

The coarse aggregate morphology quantified by angularity and surface texture properties affects performances of asphalt mixes.However,the relationship is not yet well understood due to the lack of quantitative measurement of coarse aggregate morphology,and at present the research about the influence is very little.Defining the image_based morphology parameters and using the compiled image processoring procedure to obtain the shape characteristics of five different groups of coarse aggregates with the coarse aggregate morphology considered as the principal factor,the influence described above is analyzed through the uniaxial penetration test.The result shows that each shape characteristic parameter of coarse aggregate has different influences on the shear strength,and the flat index impacts it greatest,so the content of the flat particles must be controlled.