基于分形理论的沥青混合料抗滑耐久性评价研究  

Evaluation of Durability against Sliding on the Asphalt Mix Fractal Theory

作　　者：李智[1] 王刚[1] 陈思宇[1] 

机构地区：[1]华南理工大学土木与交通学院,广州510641

出　　处：《科学技术与工程》2014年第31期302-307,共6页Science Technology and Engineering

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

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。Asphalt mixture design process take into account the effects of heat, cold, water damage, etc. , and conducted experiments in the design process to ensure the quality of design mix, but asphalt mixture design doesn＇t characterize the indicators durability against sliding at home and abroad, to solve this problem, the fractal dimen- sion is introduced as anti-slide durability evaluation of asphalt mixtures. This research process uses a quick and easy indoor rub test to rub the rut board in different time period, and simulates outdoor actual road for anti-slide decay. Then it utilizes the industrial CT machine to scan high resolution image of Cross-section in the rut board and extracts cross-section profile curve with Photoshop skills. Also, it starts to analyze and evaluate profile curve based on fractal theories. Afterwards, it can redact MATLAB routing to calculate test specimen for fractal dimension of cross-section profile curve. Finally, there is a conclusion of anti-slide decay law according to curve fitting with frac- tal dimension. To further confirm to characterize asphalt attenuation accuracy and reasonableness of the anti-slide, measuring the depth of the different tectonic plates rub stages of the rut （MTD） and put value （BPN） with a fractal dimension, eventually known as the rut board knead time continues to become larger, MTD, BPN, fractal dimen- sion, which are all showing diminishing trend that contrast verify reasonable and reliable. Therefore, the fractal di- mension can be a good cross-section structure of asphalt skid evaluate the durability of its decay law.

关 键 词：搓揉试验 断面轮廓曲线 分形维数 

分 类 号：U416.217[交通运输工程—道路与铁道工程]