重载长大纵坡沥青稳定碎石材料组成设计及路用性能研究

发布时间：2018-01-08 04:30

本文关键词：重载长大纵坡沥青稳定碎石材料组成设计及路用性能研究　出处：《重庆交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：高速公路重载长大纵坡路段应力应变分布规律较普通路段不同，对沥青混合料抗高温变形、抗疲劳及抗剪切能力要求更为严格。密级配沥青稳定碎石是骨架密实型混合料，具有良好的高温抗车辙及抗剪切能力。本文结合甘肃省交通厅项目【甘交工(科研)2012年第03号】《黄土地区高速公路长大纵坡路段沥青路面关键技术研究》，对重载长达纵坡路段沥青稳定碎石材料组成设计及路用性能进行深入研究。本文采用Bisar3.0软件进行路面结构受力分析，研究重载长大纵坡路段下面层应力应变分布规律及拉应力、剪应力最大值。以规范中ATB-30级配范围中值为中心，通过变化粗、细集料各级粒径的含量，得到五种类型级配。采用基于比表面积和油膜厚度的特征因素模型法确定初始最佳沥青用量；以石-石接触度SSC(stone-on-stone contact)、动稳定度及抗剪强度为评价指标，分析沥青稳定碎石混合料中粗集料和细集料不同比例对骨架结构及抗剪强度的影响规律，提出适合于高速公路重载长大纵坡路段ATB-30粗集料界限，并优选出三种级配；最后用旋转压实体积法确定最佳沥青用量。对所优选的三种级配沥青稳定碎石混合料进行高温稳定性，，低温抗裂性，水稳定性，疲劳性及抗剪性试验，验证其综合路用性能，并与试验路现场级配作对比分析。以《公路沥青路面施工技术规范》(JTGF40一2004)为依据,结合甘肃省雷西高速公路长大纵坡路段现场试验路及国内外相关研究成果，对ATB-30混合料拌和、运输、摊铺、碾压等环节离析控制措施及质量控制进行研究。
[Abstract]:The distribution law of stress and strain in heavy duty long longitudinal slope section of expressway is different from that of common section, and the asphalt mixture is resistant to high temperature deformation. The requirements of fatigue resistance and shear resistance are more strict. Asphalt stabilized macadam with dense gradation is a dense matrix mixture. Good high temperature rutting resistance and shear resistance. This paper combined with Gansu Provincial Department of Communications Project [Gan Jiao Gong (Scientific Research)]. 2012 No. 03 "Research on key Technology of Asphalt pavement in long Longitudinal Slope Section of Expressway in Loess region". The composition design and road performance of asphalt stabilized macadam with heavy load and long longitudinal slope were studied. In this paper, the stress analysis of pavement structure is carried out by using Bisar3.0 software, and the distribution of stress and strain and tensile stress in the lower layer of heavy load long longitudinal slope section are studied. The maximum shear stress. Taking the median value of ATB-30 gradation range in the specification as the center, the content of coarse and fine aggregates at all levels was changed. Five types of gradation were obtained. The method of characteristic factor model based on specific surface area and oil film thickness was used to determine the initial optimum asphalt content. The dynamic stability and shear strength of stone contact degree SSC(stone-on-stone contactt were taken as the evaluation index. This paper analyzes the influence of coarse aggregate and fine aggregate on skeleton structure and shear strength in asphalt stabilized macadam mixture, and puts forward the ATB-30 coarse aggregate limit suitable for heavy load and long longitudinal slope section of expressway. And three kinds of gradation were selected. Finally, the optimal asphalt content was determined by the rotary compaction volume method. The high temperature stability, low temperature crack resistance, water stability, fatigue and shear resistance of the three graded asphalt stabilized macadam mixtures were tested. The comprehensive road performance was verified and compared with the field grading of the test road. Based on the Technical Specification for Highway Asphalt pavement Construction (JTGF40-2004), combined with the field test road of long longitudinal slope section of Luoxi Expressway in Gansu Province and related research results at home and abroad. The separation control measures and quality control of ATB-30 mixture mixing, transportation, spreading, rolling and so on are studied.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414

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