沥青混合料动态模量主曲线方法对比分析  

Comparative analysis of principal curve methods of dynamic modulus of asphalt mixture

作　　者：薛羽 栗培龙[1] 高朋[1] 杨梁栋 沈明汉 XUE Yu;LI Pei-long;GAO Peng;YANG Liang-dong;SHEN Ming-han(Key Laboratory of Structure&Material Ministry of Transport,Chang'an University,Xi'an 710064,China)

机构地区：[1]长安大学道路结构与材料交通行业重点实验室

出　　处：《广西大学学报（自然科学版）》2020年第1期1-9,共9页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(51878061);交通运输部基础研究计划项目(2014319812151);中央高校科研业务费高新技术项目(300102218405&300102218513)

摘　　要：为了更好地研究沥青混合料的动态特性,在4.4、21.1、37.8、54.4℃这4个试验温度下对沥青混合料进行简单性能试验(SPT),获得动态模量随加载频率的变化规律,然后基于时-温转换原理,采用WLF法和二次多项式法对数据进行非线性拟合,以此建立动态模量主曲线模型,并对两种方法进行分析。结果表明:1)相同试验温度下,沥青混合料动态模量随荷载加载频率增大而增大,相同加载频率下,沥青混合料动态模量随试验温度升高而降低,且试验温度越低时,加载频率的影响越显著;2)WLF法和二次多项式法均可拟合动态模量主曲线,拟合度分别为0.899和0.998。相较而言,二次多项式法能有效减少预测误差,主曲线模型拟合度和光滑程度更高,能够更准确地描述沥青混合料粘弹性动态响应的影响。In order to study the dynamic characteristics of the asphalt mixture,the simple performance test was conducted on asphalt mixture at four test temperatures(4.4,21.1,37.8,and 54.4℃)to obtain dynamic modulus changing with the loading frequency.Based on the time-temperature displacement principle,WLF method and quadratic polynomial method are respectively used to conduct nonlinear fitting of data,so as to establish the main curve model of dynamic modulus and then analyze these two methods.The results indicate that 1)at the same temperature,the dynamic modulus of asphalt mixture increase with the morease of loading frequency.2)at the same loading frequency,the dynamic modulus decrease with the rise of test temperature.The lower the test the more significant the effect of loading frequency.Both the WLF method and the quadratic polynomial method can fit the master curve of dynamic modulus with a fitness of 0.899 and 0.998 respectively.In comparison,the quadratic polynomial method can effectively reduce the prediction error,and this main curve model has a higher degree of fit and smoothness,which can better describe the influence of the viscoelastic dynamic response of the asphalt mixture.

关 键 词：道路工程 简单性能试验 动态模量 主曲线 

分 类 号：U414.75[交通运输工程—道路与铁道工程]