摘要
由于目前的道路设计规范针对动态模量提出了3个使用水平,但未提出动态模量主曲线的使用方法,因此选取河北省典型混合料的多个配合比试件的动态模量测试结果作为统计样本,以Sigmoidal函数为过渡函数建立了主曲线,研究了主曲线特征参数的取值对主曲线方程的影响,分析了各参数与测试温度、混合料级配之间的关系。结果显示:β是影响主曲线形状最明显的参数,表征的是动态模量值对频率的敏感度;随着温度的提升,参数β经历了从负数变化为正数的转折,转折点温度约为30℃。
Given that the current road design specification proposes three levels of use for dynamic modulus, but does not specify how to use the master curves, the results of dynamic modulus test on typical types of asphalt mixtures in Hebei Province with different mix proportions were selected as statistical samples, a master curve was created with the Sigmoidal function as a transition function. The effect of the values of characteristic parameters on the master curve equation was studied. The relationship between each parameter and the test temperature and mix gradation was analyzed. The results show thatβ is the parameter that most obviously affects the shape of the master curve, and it represents the sensitivity of the dynamic modulus value to the frequency; with the increase of temperature, the parameterβ changes from a negative number to a positive one, and the turning point in temperature is about 30 ℃.
作者
薛善光
XUE Shan-guang(Hebei Provincial Technology Research Center for Road Structure and Material Engineering,Shiiiazhuang 050091,Hebei,China;Hebei Provincial Communications Planning and Design Institute,Shijiazhuang 050091,Hebei,China)
出处
《筑路机械与施工机械化》
2018年第7期83-87,共5页
Road Machinery & Construction Mechanization
基金
河北省交通运输厅科技计划项目(2013-1-3)
关键词
道路工程
沥青混合料
动态模量
特征参数
road engineering
asphalt mixture
dynamic modulus
characteristic parameter
