沥青混合料扭转剪切试验方法开发及扭转剪切试验研究
发布时间：2018-11-26 06:52
【摘要】：随着对沥青路面的车辙等剪切变形的深入研究,越来越多的道路从业者将目光投注到沥青混合料的抗剪性能。但是我国现行的沥青路面设计规范中还没有对抗剪强度和相应试验检测方法制定明确的规则。本文在总结和分析常见的沥青混合料抗剪性能试验的实验设备和方法的基础上,设计了一种较为简便易行的沥青混合料扭转剪切试验装置和试验方法。在总结强度理论的基础上,特别针对本文扭转试验所采用的加载方式和试件的变形特点,利用几何、物理和材料力学的知识分析圆形截面试件在扭矩作用下最大剪切应力的分布和理论计算方法。同时通过ANSYS软件,利用有限元分析了沥青混合料试件在本实验中理想状态下的受力情况。对本文中使用到的集料和沥青等原材料进行常规性能试验,设计试验中需要使用的AC-13和SMA-13两种级配,着重阐述扭转剪切试验的具体步骤以及相应的抗剪强度求算方法,并且利用扭转剪切试验与单轴贯入试验对两种级配的实验结果对比。利用扭转剪切试验来研究沥青混合料在不同级配、不同温度、不同加载速度的条件下的抗剪性能,探究其中规律。在分析疲劳破坏特点的基础上制订了扭转剪切疲劳试验方案。针对沥青混合料的疲劳性能,利用扭转剪切试验装置和疲劳试验方法进行了相关试验,探究60℃下AC-13的剪切疲劳寿命与应力比的规律,利用对数关系回归出剪切疲劳方程。本文开发的扭转剪切试验方法可以较为准确评价、检验和判断沥青混合料的抗剪性能,以期能为沥青路面设计方法相关的抗剪性能试验检测方法的建立提供参考依据。
[Abstract]:With the deep research on the shear deformation of asphalt pavement such as rutting, more and more road practitioners focus their attention on the shearing performance of asphalt mixture. However, there are no clear rules for shear strength and corresponding testing methods in the current asphalt pavement design code in China. On the basis of summing up and analyzing the common experimental equipment and methods of asphalt mixture shear performance test, a simple and easy torsional shear test device and test method for asphalt mixture is designed in this paper. On the basis of summarizing the strength theory, especially in view of the loading mode adopted in the torsion test in this paper and the deformation characteristics of the specimen, the geometry is used. Knowledge Analysis of physical and material Mechanics the distribution of maximum shear stress and theoretical calculation method of circular cross-section specimens under the action of torsion are analyzed. At the same time, the stress of asphalt mixture specimen under ideal condition is analyzed by using finite element method and ANSYS software. The conventional performance tests of aggregates and bitumen used in this paper are carried out, and the AC-13 and SMA-13 grades needed to be used in the design tests are designed. The concrete steps of torsional shear tests and the corresponding calculation methods of shear strength are described emphatically. The experimental results of the two grades were compared by torsional shear test and uniaxial penetration test. The shear resistance of asphalt mixture under different gradation, different temperature and different loading speed was studied by torsional shear test. Based on the analysis of fatigue failure characteristics, a torsional shear fatigue test scheme was developed. According to the fatigue performance of asphalt mixture, the torsional shear test device and fatigue test method were used to study the law of shear fatigue life and stress ratio of AC-13 at 60 鈩，
本文编号：2357655
[Abstract]:With the deep research on the shear deformation of asphalt pavement such as rutting, more and more road practitioners focus their attention on the shearing performance of asphalt mixture. However, there are no clear rules for shear strength and corresponding testing methods in the current asphalt pavement design code in China. On the basis of summing up and analyzing the common experimental equipment and methods of asphalt mixture shear performance test, a simple and easy torsional shear test device and test method for asphalt mixture is designed in this paper. On the basis of summarizing the strength theory, especially in view of the loading mode adopted in the torsion test in this paper and the deformation characteristics of the specimen, the geometry is used. Knowledge Analysis of physical and material Mechanics the distribution of maximum shear stress and theoretical calculation method of circular cross-section specimens under the action of torsion are analyzed. At the same time, the stress of asphalt mixture specimen under ideal condition is analyzed by using finite element method and ANSYS software. The conventional performance tests of aggregates and bitumen used in this paper are carried out, and the AC-13 and SMA-13 grades needed to be used in the design tests are designed. The concrete steps of torsional shear tests and the corresponding calculation methods of shear strength are described emphatically. The experimental results of the two grades were compared by torsional shear test and uniaxial penetration test. The shear resistance of asphalt mixture under different gradation, different temperature and different loading speed was studied by torsional shear test. Based on the analysis of fatigue failure characteristics, a torsional shear fatigue test scheme was developed. According to the fatigue performance of asphalt mixture, the torsional shear test device and fatigue test method were used to study the law of shear fatigue life and stress ratio of AC-13 at 60 鈩，
本文编号：2357655
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