湿热地区沥青缓冲隔离层老化行为及减振性能衰变机理研究

项目名称： 湿热地区沥青缓冲隔离层老化行为及减振性能衰变机理研究

项目编号： No.51268003

项目类型： 地区科学基金项目

立项/批准年度： 2013

项目学科： 建筑科学

项目作者： 杨斌

作者单位： 广西大学

项目金额： 50万元

中文摘要： 虽然半刚性或刚性（贫混凝土）基层的水泥混凝土路面结构具有强度高、刚度大，承担能力强等优点，但其减振吸能效果差，在车辆荷载的振动冲击作用下易产生断裂破坏，针对这一问题，并结合亚热带湿热环境下缓冲隔离层沥青易老化的特点，开展水泥混凝土路面沥青缓冲隔离层老化行为对路面结构减振性能衰变的影响研究。采用大型仿真环境发生器模拟隔离层基质沥青和橡胶沥青加速老化过程，通过落球振动试验、模拟车轮荷载作用的循环疲劳加载破坏试验以及沥青各项性能指标试验，分析振动响应在路面结构中的衰减规律，研究缓冲隔离层沥青老化程度、厚度、模量、橡胶粉掺量等参数变化对路面结构减振性能的影响程度，建立沥青老化程度与老化时间、温度、水等外界影响因素的模型关系；从宏观和微观角度分析缓冲隔离层中基质沥青和橡胶沥青的老化机理；依据动力学及热分析方法，建立沥青老化动力学方程；提出基于抗老化性能的沥青缓冲隔离层适宜的材料组成和层厚。

中文关键词： 亚热带湿热地区；沥青缓冲隔离层；老化；减振；衰变

英文摘要： Although the cement concrete pavement structure with a semi-rigid or rigid (lean concrete) base owns advantages such as high rigidness, high strength and large load capacity, but it has poor effect in vibration dumping and energy absorption, when impacted by the wheel load, it's easy to cause breakdowns and cracks. To solve this problem, a study is carried out to explore how the aging of asphalt isolation layer under the cement concrete pavement will influence the declining of vibration dumping and energy absorbing performance of the pavement structure. By adopting a large simulation environment generator to simulate the aging process of matrix asphalt and rubber asphalt in the isolation layer and making drop-ball test, wheel load simulation of the cycle fatigue loading damage test and test of various asphalt performance parameters, this study will analyze the declining rule of vibration response in the pavement structure, and explore to what extent the vibration dumping performance of the pavement structure is influenced by the varying parameters of asphalt in the isolation layer, such as aging degree, height, modulus and rubber powder amount, so as to establish the model relationship between the aging degree of asphalt and the outside factors such the aging time, temperature and water; to analyze the aging mec

英文关键词： Subtropical hot and humid region；Asphalt buffer isolation layer；Aging；Vibration reduction；Damping