基于数字图像技术的集料表面纹理指数研究
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摘要
为了分析集料表面微观纹理对沥青混凝土路面长期抗滑能力的影响,采用AIMS系统研究了不同类型集料在洛杉矶磨耗作用后的表面纹理指数指标及其衰减规律。结果表明,检测集料表面纹理指数能够快速准确地获得集料的微观纹理性质,对不同类型和来源的集料具有很好的区分性。集料的纹理指数与路面长期摩擦力之间的相关性很好,集料的纹理指数在洛杉矶磨耗作用下的衰变趋势与路面摩擦力的长期变化趋势一致,即磨耗初期呈快速下降趋势,但在磨耗时长大于60min后趋于稳定,符合指数函数T(t)=a+b×e~(-ct)的关系,a+b(集料纹理指数初始值)、a(集料纹理指数最终值)、c(纹理指数衰减速率)3个参数可作为评价集料抗磨耗性质及集料长期抗滑能力的指标,控制纹理指数的初始值可有效保证沥青混凝土路面的初始摩擦力,选用纹理指数衰减率低的集料则可以减缓摩擦力的下降速度。
In order to analyze the effect of aggregate surface micro-texture on long-term anti-skid performance of asphalt pavement,the surface texture indexes and attenuation laws of different aggregates after wearing in Los Angeles are studied by using AIMS system.The results show that testing aggregate surface texture index can obtain the surface micro-texture properties of aggregates quickly and accurately and has a good distinction for aggregates of different types and sources.The correlation between aggregate texture index and long-term pavement friction is very good.The attenuation trend of aggregate texture index after Los Angeles abrasion is consistent with the long-term variation trend of pavement friction,that is,the texture index decreases rapidly at the initial wearing stage but tends being stable after the wearing time exceeding 60 minutes.The attenuation law conforms to the exponential function of T(t)=a+b×ect.The three parameters of a+b(initial value of aggregate texture index),a(final value of aggregate texture index)and c(attenuation rate of aggregate texture index)can be used to evaluate the abrasion resistance and long-term skid resistance of aggregate.Controlling the initial value of aggregate texture index can ensure the initial friction of asphalt pavement effectively and choosing aggregate with low attenuation rate of texture index can reduce the falling speed of pavement friction.
In order to analyze the effect of aggregate surface micro-texture on long-term anti-skid performance of asphalt pavement,the surface texture indexes and attenuation laws of different aggregates after wearing in Los Angeles are studied by using AIMS system.The results show that testing aggregate surface texture index can obtain the surface micro-texture properties of aggregates quickly and accurately and has a good distinction for aggregates of different types and sources.The correlation between aggregate texture index and long-term pavement friction is very good.The attenuation trend of aggregate texture index after Los Angeles abrasion is consistent with the long-term variation trend of pavement friction,that is,the texture index decreases rapidly at the initial wearing stage but tends being stable after the wearing time exceeding 60 minutes.The attenuation law conforms to the exponential function of T(t)=a+b×ect.The three parameters of a+b(initial value of aggregate texture index),a(final value of aggregate texture index)and c(attenuation rate of aggregate texture index)can be used to evaluate the abrasion resistance and long-term skid resistance of aggregate.Controlling the initial value of aggregate texture index can ensure the initial friction of asphalt pavement effectively and choosing aggregate with low attenuation rate of texture index can reduce the falling speed of pavement friction.
引文
[1]熊剑平.广西公路石灰岩沥青路面使用性能研究[D].广西交通投资集团有限公司博士后工作站,2018,(6).
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[12]Eyad Masad,Joe W.Button.Unified Imaging Approach for Measuring Aggregate Angularity and Texture[J].Computer-Aided Civil and Infrastructure Engineering,2003,(4).
[13]孙杨勇.粗集料表面微观构造分形性质探讨与沥青路面抗滑性能关系研究[D].广州:华南理工大学,2010.
[14]周兴林,肖神清,肖旺新,等.粗集料表面纹理粗糙度的多重分形评价[J].华中科技大学学报:自然科学版,2017,(2):29-33.
[15]Masad E,Rezaei A,Chowdhury A,et al.Predicting Asphalt Mixture Skid Resistance Based on Aggregate Characteristics[R].2009.
[2]朱洪洲,廖亦源.沥青路面抗滑性能研究现状[J].公路,2018,(1):35-46.
[3]Mitchell M R,Link R E,Luce A,et al.NCHRP 114:Relationship of Aggregate Microtexture to Asphalt Pavement Skid Resistance[R].2007:578-588.
[4]崔喆,张生瑞.基于CT图像的集料三维棱角性计算方法[J].交通运输工程学报,2017,(5):39-49.
[5]Zhao Guo-tang,She Wei,Yang Guo-tao,et al.Mechanism of cement on the performance of cement stabilized aggregate for high speed railway roadbed[J].Construction and Building Materials,2017.
[6]万成,徐科,张肖宁,等.基于彩色数字图像技术的粗集料松方密实方法选择[J].公路交通科技,2017,(2):56-61.
[7]叶奋,丁新慧.基于数字图像处理的粗集料二维形态特征参数分析[J].上海公路,2017,(4):82-85.
[8]石立万,王端宜,吴文亮,等.基于数字图像处理的沥青混合料骨架研究[J].建筑材料学报,2016,(4):767-772.
[9]张肖宁,孙杨勇.粗集料的表面微观纹理的激光测量方法及分形性质研究[J].公路交通科技,2011,(1):19-24.
[10]郭鹏,韦万峰,唐伯明,等.再生粗集料棱角性对混合料高温性能评价[J].公路,2017,(9):220-225.
[11]陶敬林.矿料性质及其对沥青混合料高低温粘弹性能的影响研究[D].长春:吉林大学,2017.
[12]Eyad Masad,Joe W.Button.Unified Imaging Approach for Measuring Aggregate Angularity and Texture[J].Computer-Aided Civil and Infrastructure Engineering,2003,(4).
[13]孙杨勇.粗集料表面微观构造分形性质探讨与沥青路面抗滑性能关系研究[D].广州:华南理工大学,2010.
[14]周兴林,肖神清,肖旺新,等.粗集料表面纹理粗糙度的多重分形评价[J].华中科技大学学报:自然科学版,2017,(2):29-33.
[15]Masad E,Rezaei A,Chowdhury A,et al.Predicting Asphalt Mixture Skid Resistance Based on Aggregate Characteristics[R].2009.
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