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粗集料形态特征及其对沥青混合料高温抗剪强度的影响

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Keywords: 路面材料,沥青混合料,高温稳定性,粗集料,二维形态特征,数字图像

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Abstract:

采用60℃单轴贯入试验,确定沥青混合料高温抗剪强度。使用数字图像处理技术,从形状、棱角性和表面纹理对粗集料二维形态特征进行具体描述,运用等效椭圆法和筛孔尺寸修正系数识别粗集料级配。结合MATLAB软件编写程序提取粗集料形态参数,确定与沥青混合料高温抗剪强度相关的粗集料二维形态特征指标,利用图像拓扑性质欧拉数定量评价粗集料骨架稳定性。研究结果表明随着粗集料的长宽比和偏心率的降低,等效椭圆周长比和纹理指数的提高,沥青混合料高温抗剪强度增加;随着欧拉数的减小,骨架密实型沥青混合料中粗集料骨架结构的稳定性增大,高温抗剪强度增强。

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