沥青表面形貌的表征与测试及其对与集料接触特性的影响
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摘要
采用原子力显微镜对SK90#基质沥青和SBSⅠ-C改性沥青的表面形貌进行了测试,获得了两种沥青的表面形貌参数,并基于此对沥青的表面形貌特性进行了分析;基于沥青表面的高度概率密度曲线和承载面曲线,从界面实际接触面积的角度分析了沥青表面特性对与集料接触特性的影响。结果表明,SBSⅠ-C改性沥青的表面起伏情况高于SK90#基质沥青,具有更大的表面粗糙度。具有更大S_(sk)(歪斜度)的沥青更有利于形成更好的黏附强度,但也更容易发生磨损而使黏附性能快速降低。沥青与集料间的接触性能受其实际接触面积的影响,SBSⅠ-C改性沥青具有与集料更大的实际接触面积,从而形成更大的摩擦力而具有更优良的黏附性能。
The surface morphology of SK90# matrix asphalt and SBS I-C modified asphalt was tested by atomic force microscopy,and the surface morphology parameters of two kinds of asphalt were obtained.Based on this,the surface morphology characteristics of the asphalt were analyzed. Based on the high probability density curve and the bearing surface curve of the asphalt surface,the actual contact area of the interface was obtained,and the influence of asphalt surface characteristics on contact characteristics with aggregate was analyzed. The results show that the surface undulation of SBS Ⅰ-C modified asphalt is higher than that of SK90# matrix asphalt,and SBS Ⅰ-C modified asphalt has greater surface roughness.The larger S_(sk) is conducive to better adhesion strength between asphalt and aggregate,but it is also easier to wear and reduce the adhesion performance rapidly. The contact performance between the asphalt and the aggregate is influenced by the actual contact area. The SBS I-C modified asphalt has a larger actual contact area with the aggregate,thus forming a greater friction force and having a better adhesion property.
The surface morphology of SK90# matrix asphalt and SBS I-C modified asphalt was tested by atomic force microscopy,and the surface morphology parameters of two kinds of asphalt were obtained.Based on this,the surface morphology characteristics of the asphalt were analyzed. Based on the high probability density curve and the bearing surface curve of the asphalt surface,the actual contact area of the interface was obtained,and the influence of asphalt surface characteristics on contact characteristics with aggregate was analyzed. The results show that the surface undulation of SBS Ⅰ-C modified asphalt is higher than that of SK90# matrix asphalt,and SBS Ⅰ-C modified asphalt has greater surface roughness.The larger S_(sk) is conducive to better adhesion strength between asphalt and aggregate,but it is also easier to wear and reduce the adhesion performance rapidly. The contact performance between the asphalt and the aggregate is influenced by the actual contact area. The SBS I-C modified asphalt has a larger actual contact area with the aggregate,thus forming a greater friction force and having a better adhesion property.
引文
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[2]葛折圣,黄晓明,袁斌.沥青技术性能对混合料疲劳性能的影响[J].公路,2002(10):113-115.
[3]孙大权,吕伟民.用测力延度试验评定聚合物改性沥青低温性能[J].建筑材料学报,2007(1):37-42.
[4]黄卫东,吕伟民.沥青及沥青混合料流变性质与动稳定度的关系[J].同济大学学报(自然科学版),2000(4):501-504.
[5]郭咏梅,倪富健.基于DSR的改性沥青及混合料动态黏弹性能[J].东南大学学报(自然科学版),2014,44(2):386-390.
[6]Tan Y,Guo M.Interfacial thickness and interaction between asphalt and mineral fillers[J].Materials&Structures,2014,47(4):605-614.
[7]Gong M,Yang J,Wei J,et al.Characterization of adhesion and healing at the interface between asphalt binders and aggregate using atomic force microscopy[J].Transportation Research Record Journal of the Transportation Research Board,2015,2506:100-106.
[8]张宜洛,郭其杰,纪小平.沥青稳定再生集料的试验研究[J].建筑材料学报,2016,19(3):584-589.
[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,2011,28(1):19-24.
[10]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),2017,45(2):29-33.
[11]杨军,龚明辉,Pauli T,等.基于原子力显微镜的沥青微观结构研究[J].石油学报(石油加工),2015,31(4):959-965.
[12]李曦鹏.基于微观特性的温拌沥青老化特性研究[J].硅酸盐通报,2016,35(11):3741-3747.
[13]李贵谋,聂楚南.用真实接触面积计算静摩擦系数[J].润滑与密封,1981(5):5-11.
[14]Zhang X H.An analysis of the multi-scale structure of rough surfaces[D].Auburn:Auburn University,2014.
[15]张晓寒.表面粗糙度以及多尺度粗糙表面的研究[D].太原:太原科技大学,2015.
[16]Stachowiak G W,Batchelor A W.Engineering tribology(third edition)[M].Oxford:Butterworth-Heinemann,2006.