面层沥青混合料模量取值研究

发布时间：2018-06-02 22:14

本文选题：弯曲劲度模量 + 抗压回弹模量　；参考：《长安大学》2015年硕士论文

【摘要】：沥青混合料的弯曲劲度模量与抗压回弹模量是沥青路面结构设计与温度性能评价的重要参数。尤其对面层沥青混合料而言,模量的大小与材料的力学性能密切相关,直接影响着沥青混合料的路用性能。但目前研究中缺乏针对沥青混合料模量与温度、混合料材料参数的相关性研究,对沥青路面结构设计与行为分析中合理模量参数取值的重要性认识较为不足。本研究通过收集既有沥青混合料弯曲劲度模量与抗压回弹模量试验数据,建立沥青混合料模量数据库,在此基础上对比分析温度、级配参数、沥青参数与混合料模量的关系;利用数学回归方法,建立不同温度、级配、粒径及沥青种类下的混合料模量预测方程,为沥青路面结构设计与性能评价提供模量取值依据。沥青混合料弯曲劲度模量与抗压回弹模量的对比分析结果表明:温度、公称最大粒径、沥青用量、沥青结合料类型、沥青标号的变化均会对混合料的模量产生不同程度的影响。其中,温度对混合料模量的影响最为显著;沥青用量对混合料模量的影响较为复杂,根据实际情况选用合理的沥青用量,有利于提高混合料的抗变形能力与低温抗裂能力;对沥青结合料而言,选用SBS、SBR等改性沥青可获得较好的力学性能,有效降低沥青混合料的温度敏感性;对沥青混合料弯曲劲度模量与抗压回弹模量随温度的变化进行回归分析,建立了温度与混合料模量的关系方程,引入模量修正系数对不同粒径、沥青类型下的模量预测结果进行修正,通过对模型计算值与试验实测值的对比验证,结果表明,所建立的对数模型具有较高的拟合精度与再现性,可为沥青路面结构设计与行为分析中模量参数的取值提供参考依据。
[Abstract]:The flexural stiffness modulus and compressive resilience modulus of asphalt mixture are important parameters for structural design and temperature performance evaluation of asphalt pavement. Especially for the surface asphalt mixture, the modulus is closely related to the mechanical properties of the material, which directly affects the pavement performance of the asphalt mixture. However, there is a lack of research on the correlation between asphalt mixture modulus, temperature and material parameters, and the importance of reasonable modulus parameters in structural design and behavior analysis of asphalt pavement is not well understood. Through collecting the experimental data of bending stiffness modulus and compressive resilience modulus of existing asphalt mixture, the database of asphalt mixture modulus is established, and the relationship between temperature, gradation parameter, asphalt parameter and mixture modulus is analyzed. By using mathematical regression method, the prediction equations of mixture modulus under different temperature, gradation, particle size and asphalt type are established, which can provide the basis for structural design and performance evaluation of asphalt pavement. The results show that temperature, nominal maximum particle size, asphalt content, asphalt binder type and asphalt grade will have different effects on the modulus of asphalt mixture. The influence of temperature on the modulus of mixture is the most significant, and the influence of asphalt content on the modulus of mixture is more complex. According to the actual situation, choosing reasonable amount of asphalt is beneficial to improve the anti-deformation ability and low-temperature anti-cracking ability of mixture. For bituminous binder, the modified asphalt such as SBS- SBR can obtain better mechanical properties, reduce the temperature sensitivity of asphalt mixture effectively, and make regression analysis on the change of flexural stiffness modulus and compressive resilience modulus of asphalt mixture with temperature. The relation equation between temperature and mixture modulus is established, and the modulus correction coefficient is introduced to modify the prediction results of modulus under different particle size and asphalt type. The logarithmic model has high fitting accuracy and reproducibility, which can be used as a reference for the determination of modulus parameters in structural design and behavior analysis of asphalt pavement.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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