掺量对TLA混合沥青的高温性能影响和应用研究

发布时间：2018-03-26 00:45

本文选题：TLA混合沥青　切入点：沥青玛蹄脂混合料　出处：《华南理工大学》2014年博士论文

【摘要】：钢箱梁桥面沥青铺装是当前土木工程材料应用的国际性难题和研究热点，它是桥梁建设的关键技术之一，一直受到国内外桥面铺装专家的高度重视和关注。目前，比较常用的桥面沥青铺装方案主要有双层SMA类、浇注式类、沥青玛蹄脂混合料（MA）类和环氧类，其中MA混合料因具有突出的防水性能、抗老化性能、抗疲劳性能以及与钢桥面板良好的随从性和施工性，在钢桥面铺装中被认为是一种理想的材料，并在国外被广泛的应用。如今这类混合料在英国、日本等国已经形成一套完整的铺装技术规范，近年来被引入国内，并在多个实体工程中得以应用，但从使用效果看，沥青玛蹄脂混合料虽然在防水性能、低温抗裂性能、抗疲劳性能和经济方面均优于其它桥面沥青铺装材料，但是MA混合料也存在着非常明显的缺陷，即高温稳定性不足，容易产生车辙等早期病害。由于MA混合料中TLA混合沥青为其提供了40%的抗高温车辙变形性能，因而为深入分析和合理设计MA混合料，就需对MA混合料的组成材料，特别是TLA混合沥青的高温性能进行全面研究。根据国外关于MA混合料的设计和研究，MA混合料中TLA的掺量通常是为30%左右，本文依托的港珠澳大桥钢桥面MA混合料铺装层的设计研究项目，在参考香港MA混合料的成功铺装经验采用掺量为70%TLA混合沥青，为从理论上验证分析掺量70%TLA混合沥青对MA混合料高温稳定性的影响作用，就需对TLA混合沥青的组成材料和制备、TLA掺量对混合沥青高温力学性能影响等方面进行系统研究，研究70%TLA混合沥青对MA混合料高温稳定性的影响变化，这对于MA混合料的桥面铺装工程应用具有重要的理论指导意义。本文系统的研究了基于沥青桥面铺装使用的TLA混合沥青高温流变性能，建立了流变模型，并探讨了掺量对TLA混合沥青高温性能的影响、TLA混合沥青的高温变形特点以及对MA混合料高温稳定性能的影响规律。主要研究内容如下： 1、在深入研究传统TLA混合沥青的制备与评价基础上，针对港珠澳大桥15.6Km钢箱梁桥面铺装工程的规模性，，借鉴香港已有的TLA混合沥青成功的工程应用，考虑到桥址地区交通荷载组成和高温多雨的气候环境特点，采用TLA：70#沥青=70：30制备TLA混合沥青，分析TLA混合沥青的性能指标与TLA掺量和沥青标号的关系。 2、鉴于MA在江阴大桥工程应用中出现的高温稳定性不足的问题，需从微观方面全面分析掺量70%TLA混合沥青的高温性能，并基于DMA法研究了TLA混合沥青的SHRP高温性能指标复数模量、车辙因子、相位角与频率、温度和掺量的变化关系；并基于稳态流变试验分析TLA混合沥青的零剪切粘度指标的变化规律。 3、研究了不同掺量的TLA混合沥青的时温等效原理，将不同掺量的TLA混合沥青在不同加载方式下的移位因子进行计算对比分析；并基于剪切模量CAM主曲线方程对TLA混合沥青的高温流变共曲线进行分析，探讨了TLA混合沥青的高温流变参数指标与TLA掺量的关系，为采用70%TLA混合沥青提供理论依据。 4、基于不同温度、应力水平下的重复蠕变恢复试验，分析不同掺量的TLA混合沥青高温变形特点和影响因素，并基于流变模型重点分析了70%TLA混合沥青的高温变形流变参数的变化规律；对不同掺量的TLA混合沥青与SBS改性沥青的高温变形差异研究，选择合适掺量的TLA混合沥青与SBS改性沥青应用于同种级配的混合料，基于车辙试验对比了TLA混合沥青与聚合物SBS改性沥青之间的高温抗变形差异。 5、基于70%TLA混合沥青在桥面面铺装层中的应用研究，分析了MA混合料的高温稳定性能，研究了TLA在MA混合料的高温稳定性中的作用，并就MA车辙试验的高温稳定性能进行室外加速加载试验的验证，分析动稳定度与加速加载试验的车辙变形、硬度、贯入度、贯入度增量和冲击韧性之间的相关性。本论文从依托的工程项目所需70%TLA混合沥青的高温性能研究出发，基于DMA法分析了掺量对TLA混合沥青的高温性能影响规律，重点研究70%TLA混合沥青的高温性能变化规律及高温变形特点，从理论和实际两方面验证港珠澳大桥桥面铺装中采用掺量70%TLA混合沥青对提高MA混合料高温稳定性的作用和必要性，为桥面铺装中70%TLA混合沥青的实际生产和应用提供了理论依据。
[Abstract]:Steel deck asphalt pavement is an international difficult problem in current civil engineering material application and research hotspot, it is one of the key technology of bridge construction, has been more and more attention at home and abroad deck experts. At present, the commonly used bridge asphalt pavement scheme to double SMA, pouring type asphalt mastic the mixture (MA) and epoxy, which MA mixture due to outstanding waterproof performance, anti-aging properties, and good anti fatigue performance and steel deck entourage and construction, in the steel bridge deck is considered to be an ideal material, and is widely used in foreign countries. Now this mixture in the UK, has formed a complete set of technical specifications of pavement in Japan and other countries, in recent years was introduced into China, and has been applied in numerous projects, but the result shows that although the mastic asphalt mixture at Waterproof performance, low-temperature performance, anti fatigue performance and economic aspects are better than other bridge asphalt pavement material, but MA mixture also existed obvious defects, namely poor high-temperature stability, easy to produce early disease rut. Because MA in TLA mixture asphalt mixture to provide 40% anti rutting deformation the performance, thus for the in-depth analysis and rational design of MA mixture, on the composition of the MA mixture material, especially a comprehensive study on the high temperature performance of TLA asphalt mixture. According to foreign design and Research on MA mixture and MA mixture in TLA content is usually around 30%, the design of research projects steel bridge HZMB MA mixture paving layer on the basis of the reference in Hongkong MA mixture pavement success experience using admixture for 70%TLA mixed asphalt, as from the theoretical analysis to verify the admixture of 70%TLA asphalt mixture The effect of MA mixture at high temperature stability, will be composed of materials and preparation of TLA mixture asphalt preparation, the content of TLA is a systematic research on the high temperature performance of asphalt mixing mechanics effect, research 70%TLA mixed asphalt mixture high temperature stability of MA, has an important theoretical significance of the bridge deck pavement engineering application for the MA mixture. The study of this system based on the asphalt deck pavement using TLA mixed asphalt high temperature rheological properties, rheological model, and discusses the influence of TLA content on the high temperature performance of asphalt mixture, the deformation characteristics of high temperature TLA mixed asphalt and mixed material influences the high-temperature stability of MA. The research contents are as follows:
1, in-depth study of traditional TLA mixed asphalt preparation and evaluation on the basis of the scale of the Hong Kong Zhuhai Macao Bridge 15.6Km bridge deck pavement engineering drawing, engineering application of TLA mixed asphalt in Hongkong have been successful, considering the characteristics of climate and environment of the site of bridge traffic load and the high temperature and rainy, the preparation of TLA by mixed asphalt TLA:70# asphalt =70:30 system, relation between performance index and the content of TLA and TLA analysis of asphalt grade asphalt mixture.
2, given the lack of high temperature stability of MA in the Jiangyin bridge engineering application problems, high temperature performance need comprehensive analysis content of 70%TLA mixed asphalt from the microscopic aspect, the high temperature performance of SHRP complex modulus, which is based on the DMA method of TLA mix asphalt rutting factor, phase angle and frequency, temperature and mixing the amount of variation; and zero shear viscosity index analysis of TLA mixed asphalt based on the steady flow test.
3, the time temperature equivalence principle on the TLA mixture of asphalt with different amount of TLA mixed asphalt with different contents of the shift factor under different loading modes are calculated and analyzed; the shear modulus CAM principal curve equation based on the rheology of TLA asphalt mixture high temperature co curve analysis, discusses the relationship between High Temperature Rheological parameters index and the content of TLA TLA mixed asphalt, provided a theoretical basis for using 70%TLA mixed asphalt.
4, based on different temperature, should be repeated creep stress level recovery test, analysis of TLA mixed with different amount of asphalt high temperature deformation characteristics and influencing factors, and based on the variation of key rheological model of the high-temperature 70%TLA mix asphalt rheological deformation parameters; deformation difference of high temperature on different content of TLA mixed asphalt and SBS modified asphalt mixture, select the appropriate dosage of TLA mixed asphalt and SBS modified asphalt used in the same gradation, high temperature rutting test were compared between TLA mixed asphalt and polymer modified asphalt SBS anti deformation based on the difference.
5, research on the application of 70%TLA in bridge deck pavement of asphalt mixture based on the analysis of the MA mixture high temperature stability, study the role of TLA in the high temperature stability of MA mixture in the outdoor and verify the accelerated loading test of high temperature stable performance MA rutting test, dynamic stability analysis and accelerated loading test the rutting deformation, hardness, penetration, the correlation between the penetration increment and impact toughness.
Study on high temperature performance of the project from relying on the required 70%TLA mixed asphalt based DMA method based on analysis of the content of high temperature performance influence of TLA mixture of asphalt and the deformation characteristics of high temperature and high temperature performance of 70%TLA asphalt mixture research, from two aspects of theory and practice to validate the content of 70%TLA mixed asphalt deck pavement HZMB on necessity and improve MA mixture high temperature stability, provide a theoretical basis for practical production and application for 70%TLA mixed asphalt bridge deck pavement.

【学位授予单位】：华南理工大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：U444

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