沥青—集料界面相结构和粘附机理研究

发布时间：2018-05-10 15:41

本文选题：棱角性系数 + 扫描电镜　；参考：《长安大学》2014年硕士论文

【摘要】：公路快速发展，优质碱性集料因过度盲目地开采而匮乏，，可就地利用的酸性、中性等集料却普遍被认为与沥青间粘附性差会引起路面早期水损害而限制了其合理利用。如何合理评价集料与沥青之间的粘附机理，改善沥青-集料界面粘附作用，对提高沥青路面质量，促进酸性和中性集料在道路建设中的应用具有重要理论和现实意义。论文基于界面理论，采用数码成像技术、集料棱角性系数测定仪、扫描电镜、matlab分形维数计算等方法表征不同类型集料表面宏观和微观形貌；采用X射线衍射(XRD)分析不同岩性集料的化学成分；利用扫描电镜研究不同类型的沥青-集料的界面相结构；借助拉拔仪测量不同类型的沥青-集料间的界面相强度；利用动态剪切流变试验和X射线光电子能谱(XPS)分析沥青与集料在界面处的化学作用；结合混合料路用性能测试，建立混合料路用性能指标与沥青-集料界面相强度间相互关系。结果表明，集料颗粒的棱角性系数与其表面纹理分形维数、集料颗粒表面分形维数与沥青-集料界面相强度均呈现良好的线性正相关关系，集料表面粗糙度越大，其与沥青间形成界面相强度也越高；XPS试验分析得出，石灰岩中的化学成分CaCO3与沥青中含S元素的亚砜类官能团之间存在化学作用，从而增强了沥青-集料界面相强度。沥青混合料路用性能测试结果表明，沥青-集料界面相强度是影响混合料的路用性能优劣的关键因素。增加集料颗粒表面纹理构造是提高沥青-集料界面相强度的有效方法。
[Abstract]:With the rapid development of highway, the high quality alkaline aggregate is scarce because of excessive and blind mining, and the acid and neutral aggregates which can be used locally are generally considered that the poor adhesion between asphalt and asphalt will cause early water damage to pavement and restrict its reasonable utilization. How to evaluate the adhesion mechanism between aggregate and asphalt reasonably and improve the interface adhesion between asphalt and aggregate has important theoretical and practical significance to improve the quality of asphalt pavement and promote the application of acidic and neutral aggregate in road construction. Based on the interface theory, the paper uses digital imaging technology, aggregate angular coefficient tester, scanning electron microscope MATLAB fractal dimension calculation methods to characterize the surface of different types of aggregate macro and micro morphology; The chemical composition of different lithologic aggregates was analyzed by X-ray diffraction (XRD), the interfacial phase structure of different types of asphalt-aggregate was studied by scanning electron microscope, the strength of interfacial phase between different types of bitumen and aggregate was measured by drawing instrument. The dynamic shear rheological test and X-ray photoelectron spectroscopy (XPS) were used to analyze the chemical action between asphalt and aggregate at the interface, and the relationship between the pavement performance index and the strength of asphalt aggregate interface was established. The results show that there is a good linear positive correlation between the angular coefficient of aggregate particle and its surface texture fractal dimension, and between the fractal dimension of aggregate particle surface and the strength of bituminous aggregate interface phase, and the greater the surface roughness of aggregate is, The higher the strength of the interfacial phase formed between it and the asphalt, the higher the strength of the interface phase. The chemical composition CaCO3 in the limestone and the sulfoxide functional group containing S element in the asphalt have a chemical interaction, thus enhancing the strength of the interface phase between the asphalt and the aggregate. The test results show that the interface strength between asphalt and aggregate is the key factor to influence the pavement performance of asphalt mixture. Increasing the texture of aggregate surface is an effective method to improve the phase strength of bitumen-aggregate interface.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414

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