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基于细观分析的沥青混合料组成结构研究
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摘要
我国高速公路沥青路面建设二十多年以来,随着使用性能要求的提高,无论是设备或技术都达到了一个较高水平,但不同形式的局部早期损坏时有发生的问题仍然没有彻底的解决。高速公路的渠化、重载交通固然是一个因素,而沥青混合料的复杂性更是一个重要的根本原因。由于沥青混合料作为具有粘性和温度敏感性的散粒体结构是非均质、各向异性的;同时其使用性能受施工工艺、结构条件的影响。因此,对沥青混合料组成结构的研究不能够仅停留在材料的宏观层面,需要深入到细观层次的分析和研究。
     本文从细观分析角度入手,以高温抗剪切性能和抗水损害的统一为目标,在材料-结构-工艺一体化思想的指导下进行了沥青混合料组成结构的研究。
     通过将图像处理技术和力学试验技术相结合,所建立的沥青混合料细观指标体系,针对高温车辙突出了HMA的细观力学性能分析,针对水损害突出了HMA孔隙结构分布的细观分析。
     以抗剪强度为目标调整不同级配微分布的组合,不同类型的沥青混合料存在细观力学参数C和?的最优组合问题;进一步基于图像分析处理的方法,对沥青混合料各组成结构进行的研究和分析表明:这种细观力学现象的出现是由包括集料与胶浆的分布、孔洞的分布、集料就位方式的分布等HMA细观结构所决定的。
     围绕级配微分布的不同组合,论文还对HMA的工艺特性,包括离析特性和压实特性以及各沥青结构层的三向应力分布和使用功能要求进行了分析研究,通过综合归纳就实现材料-结构-工艺一体化的理念,提出了基本原则和初步的设计方法与实施要点。
Hot-Mix Asphalt mixture (HMA) is good performance meterial for freeway pavement. In recent years, related technology has been improved, But the high temperature rutting and water damage are still two main problems. HMA is a heterogeneous, viscous and temperature-sensitive granular material, Furthermore, the performance of HMA depends on not only material but also construction and even the situation of pavement structure. The research on HMA should not only stay on macro level analysis but also the submicro level deeply, so the object of this paper focus on analysis of the internal structure. Propose Material-Structure-Construction integrative design method base on the internal analysis of HMA.
     In this paper, Base on image processing technology and internal mechanics experiment, establish the internal structure index system. Depend on this index system we can analyze the internal structure of HMA. Such as the shape of aggregate, the gradation of aggregate, distribution of aggregate and mastic, the orientation of aggregate, the holes of HMA and the shear parameters of cohesion and angle of internal friction.
     Further more, with the adjustment of the micro-distribution of aggregate the shear strength has different corresponding value, for good shear performance, in different HMA, the combination of C andφreflect different rule. The index of image processing can be used to explain the internal reason of performance.
     Research the segregation and compaction of HMA under different aggregate gradation. Analyze distribution of stress in pavement layers and the requirement of performance.
     Finally, propose Material-Structure-Construction integrative design theory and base on the internal structure and mechanics analysis, give the design and construction adjustment method.
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