发展沥青混合料间接拉伸动态模量及其主曲线

摘要

沥青混合料的动态模量是沥青路面设计的重要参数,间接拉伸试验的优势决定了在该试验模式下测定沥青混合料动态模量的重要意义.采用我国3种典型的沥青混合料,在间接拉伸试验模式下,基于GPM测试模式,通过修正的二轴方向的应力和应变决定沥青混合料的动态模量.根据时间-温度转换原则,通过Hirsch模型估算混合料模量极大值,分别采用Global Aging模型和Arrhenius模型获得移位因子,通过数值优化发展了参考温度为20℃的3种典型沥青混合料动态模量及相位角主曲线,得出了主曲线的Sigmoidal数学模型,拟合的相关系数R2均在0.99以上,表明模型拟合效果非常好.%Dynamic modulus of asphalt concrete is the important parameter for the asphalt pavement. Based on the indirect tension test mode, adopting three typical mixes in China, using the GPM testing mode, the indirect tension dynamic modulus were determined according to the corrected biaxial strain and stress. Master curves are constructed using the principle of time-temperature superposition. The Hirsch model was used to estimate the limiting maximum modulus of the mixtures, the Global Aging Model and the Arrhenius Model are used to obtain the shift factors, the master curves and the Sigmodial function of master curves are determined by numerical optimization for three typical mixes. The goodness of fit statistics provides an excellent fit to the measured data with the correlation coefficient R2 all greater than 0.99. The results clearly show the Sigmodial function of IDT dynamic modulus master curves for three mixes are goodness of fit statistics.