静、动抗压回弹模量的试验研究  

Experimental Study on Static and Dynamic Compressive Resilient Moduli

作　　者：刘靖宇[1] 王旭东[2] 刘朝晖[1] 房占永 

机构地区：[1]长沙理工大学交通运输工程学院,湖南长沙410004 [2]交通运输部公路科学研究院,北京100088 [3]东南大学交通学院,江苏南京210096

出　　处：《公路交通科技》2017年第6期45-52,共8页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51678078);湖南省研究生科研创新项目(CX2015B351)

摘　　要：为研究沥青混合料组成设计及静、动态试验方法等对回弹模量的影响规律,进一步完善沥青混合料设计参数,利用MTS-810进行单轴无侧限、顶面法的静、动抗压回弹模量及强度的室内试验。结果表明:沥青混合料强度与模量并无直接关系;混合料级配和沥青品质都会影响回弹模量取值,且相对而言沥青品质的影响较显著。通过研究试验过程中静、动载下材料的变形演化规律,结合开尔文力学模型及沥青混合料黏弹理论分析论证了静、动模量的局限性,表明混合料的黏滞性是影响静、动模量取值的重要因素,并导致所得模量偏小。最后,对静、动模量的线性关系进行研究并得到不同公称最大粒径混合料的静动模量转换方程,较现有方程更为准确。To study the effect law of asphalt mixture composition design and static/dynamic test methods on resilient modulus, and consummate the design parameters of asphalt mixture, the laboratory tests on static/ dynamic compression resilient moduli and strength are conducted by the uniaxial unconfined method and top measuring method by MTS- 810. The result shows that （I） there is no direct relationship between strength and resilient modulus of asphalt mixture; （2） both the aggregate gradation and asphalt quality can influence the value of resilient modulus, and the influence from asphalt quality is more significant. By studying the deformation law of the material under static and dynamic loading throughout the test, and combining with the Kelvin mechanic model and viscoelastic theory of asphalt mixture, the limitations of the static and dynamic moduli are demonstrated. It shows that the viscoelastic property is the important factor affecting the values of static and dynamic moduli of the mixture, and resulting in Smaller values of moduli. In the end, the linear relationship between static and dynamic moduli is researched, and the conversation equation of static and dynamic moduli for different nominal maximum aggregate sized mixture is obtained, which is more accurate compared to the existing formula.

关 键 词：道路工程 静动模量关系 单轴压缩 足尺环道 分级加载 

分 类 号：U416.217[交通运输工程—道路与铁道工程]