基于分形理论的沥青混合料抗滑耐久性评价研究

发布时间：2018-05-07 22:30

本文选题：搓揉试验 + 断面轮廓曲线　；参考：《科学技术与工程》2014年31期

【摘要】：沥青混合料的设计过程均考虑到高温,低温,水损等的影响,并在设计过程中进行了相关实验来保证混合料的设计质量,但是在国内外沥青混合料设计中,并没有表征其抗滑耐久性的指标,为解决此问题,引入分形维数作为沥青混合料的抗滑耐久性评价指标。研究过程采用快速,简便的室内搓揉试验对车辙板进行不同时间段的搓揉,室内模拟路面抗滑衰减,用工业CT机扫描出试件断面高精度图像,photoshop技术提取断面轮廓曲线,并且对轮廓曲线采用分形理论进行分析和评价,编写MATLAB程序计算试件断面轮廓曲线的分形维数,最后对分形维数进行曲线拟合得出沥青混合料抗滑衰减规律的结论。为进一步证实用分形维数来表征沥青混合料抗滑衰减的准确合理性,测量不同搓揉阶段的车辙板的构造深度(MTD)和摆值(BPN),最终可知随着车辙板搓揉时间的不断变大,MTD,BPN,分形维数,三者均呈现不断递减的趋势,即对比验证合理可靠。因此,断面构造的分形维数能够很好的评价沥青混合料的抗滑耐久性及其衰减规律。
[Abstract]:The design process of asphalt mixture takes into account the influence of high temperature, low temperature, water loss and so on, and carries on the related experiment in the design process to guarantee the mixture design quality, but in the domestic and foreign asphalt mixture design, In order to solve this problem, fractal dimension is introduced as the evaluation index of asphalt mixture's anti-skid durability. In the research process, the rutting board was rubbed in different time periods by a quick and simple indoor rub test, and the anti-slip attenuation of the road surface was simulated in the laboratory. The section contour curve was extracted by photoshop technique by scanning the high precision image of the specimen section by using the industrial CT machine. The fractal theory is used to analyze and evaluate the profile curve, and the MATLAB program is compiled to calculate the fractal dimension of the profile curve of the specimen. Finally, the conclusion of the anti-slip attenuation law of asphalt mixture is obtained by fitting the fractal dimension of the fractal dimension. In order to further confirm the accuracy and reasonableness of using fractal dimension to characterize the anti-slip attenuation of asphalt mixture, the structural depth of rutting board and the value of pendulum are measured in different rubbing stages. Finally, it is known that with the increasing of rutting time, the fractal dimension of MTDBPN is increased. The three showed a decreasing trend, that is, the comparison proved reasonable and reliable. Therefore, the fractal dimension of section structure can evaluate the anti-slip durability and attenuation law of asphalt mixture.
【作者单位】：华南理工大学土木与交通学院;
【基金】：国家自然科学基金重点项目(51038004);国家自然科学基金面上项目(51378223)资助
【分类号】：U414

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