沥青混合料四点弯曲动态模量试验研究

Research on Four-Point Bending Dynamic Modulus Test of Asphalt Mixtures

沥青混合料的动态模量主要有压缩动态模量、劈裂动态模量和弯曲动态模量。考虑到四点弯曲更符合沥青路面实际的弯拉受力状态,进行了沥青混合料四点弯曲动态模量试验,采用LDMT-25疲劳试验系统,应用非接触式的位移量测方法,在试验温度、加载频率和应力比不同组合的工况下,对AC-13C型沥青混合料四点弯曲动态模量值进行了测定,分析了试验中四点弯曲动态模量的影响因素。

Dynamic modulus of asphalt mixtures is mainly consisted of compression dynamic modulus, indirect tensile dynamic modulus and bending dynamic modulus. Taking into account that the four - point bending stress state is more in line with the actual flexural - tensile stress state of asphalt pavement, this paper did the experiment of four - point bending dynamic modulus of asphalt mixtures. This paper used LDMT - 25 fatigue testing system and the contacfless measurement method of displacement to do the experiments of four - point bending dynamic modulus under combination for different working conditions of temperature, frequency and stress, got the values of four - point bending dynamic modulus and analyzed the factors which influent them.