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细集料形貌的分维数评价及沥青混合料性能试验

Keywords: 道路工程,沥青混合料,形貌,分维数,细集料

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Abstract:

采用体视显微镜与面光源结合的细集料形貌测量方法获取五种细集料在0.003mm/pixel分辨率下的颗粒图像,运用颗粒分维模型,以分维数表征细集料形貌特性,开展了细集料形貌及其对沥青混合料性能影响的研究。分析结果表明细集料分维数服从三参数威布尔分布且不同细集料的分维数具有显著差异;细集料分维数与沥青混合料的体积参数具有显著的线性相关性;随着分维数的增大,混合料的极限弯拉应变和冻融劈裂强度比均是先增加后减小,在一定范围内存在最大值;但细集料分维数对混合料高温稳定性的影响并不明显。

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