粗集料表面纹理粗糙度的多重分形评价

发布时间：2018-01-12 20:29

本文关键词：粗集料表面纹理粗糙度的多重分形评价　出处：《华中科技大学学报(自然科学版)》2017年02期 　论文类型：期刊论文

【摘要】：以多重分形理论为基础,研究了6种集料(闪长岩、辉绿岩、花岗岩等,粒径为9.5~13.2mm和13.2~16mm两档)表面粗糙度.通过60X显微放大6种集料表面,获得各集料较为直观的粗糙度评价;然后采用激光轮廓仪获取集料表面轮廓高程数据,对轮廓数据进行Butterworth高通滤波处理,分离出表面粗糙度纹理信号,验证了集料表面纹理具有多重分形特性;最后对各集料的多重分形谱参数Δα与集料磨光值pPSV进行相关性分析.结果表明:多重分形谱参数Δα和Δf较单参数能更细致地表征集料表面粗糙度,Δα从整体上表征集料表面高程分布不均匀的程度,Δf从高程峰谷值局部表征表面起伏特性;Δα与pPSV具有较好的线性关系(拟合优度达0.84),集料磨光值越高,其谱宽越大;运用多重分形谱评价集料表面纹理粗糙度具有可行性,并且能为集料实际工程应用提供快速、全面的评价方法.
[Abstract]:The multifractal theory, 6 kinds of aggregates (Shan Changyan, diabase, granite, particle size of 9.5~13.2mm and 13.2~16mm two). The surface roughness of the aggregate surface by amplification of 6 60X were obtained, the aggregate intuitionistic roughness evaluation; then using laser profilometer for aggregate the surface contour elevation data, the contour data of Butterworth high pass filtering, isolated surface roughness texture signal, verify the aggregate surface texture has the multifractal characteristics; finally, the multifractal spectrum parameters of alpha delta aggregate and aggregate grinding light value pPSV by correlation analysis. The results show that the multifractal spectrum parameters. Alpha and delta f with single parameter can more detailed surface material for surface roughness, alpha delta from the overall characterization of aggregate surface elevation distribution uneven degree, a f from the Gao Chengfeng Valley local characterization of surface fluctuation; delta alpha and pPSV A better linear relationship (0.84 goodness of fit) is obtained. The higher the aggregate polishing value is, the larger the spectral width is. The multifractal spectrum is feasible for evaluating aggregate surface texture roughness, and it can provide a fast and comprehensive evaluation method for practical engineering application of aggregate.

【作者单位】：武汉科技大学汽车与交通工程学院;交通运输部公路科学研究所;
【基金】：国家自然科学基金资助项目(51578430，，51378243) 湖北省自然科学基金重点资助项目(2015CFA064) 湖北省科技支撑计划资助项目(2014BEC055)
【分类号】：U416.217
【正文快照】： 2交通运输部公路科学研究所,北京100088)粗集料表面纹理粗糙度对沥青道路表面抗滑能力有着明显的影响[1-2].工程上一般选粗集料制件后进行磨光,然后通过摆值测量来获取石料的磨光值,以此来判断能否用于沥青道路表面磨耗层.磨光试验制件较难,而且需要不断装件、取件等操作,试验

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