论文部分内容阅读
对几种常用沥青混凝土进行了动态模量试验研究,并对Witczak动态模量预估模型进行了验证。试验研究表明:沥青混凝土的动态模量随温度增加而减小,且呈明显指数关系;沥青混凝土动态模量随加载频率提高而增大,当环境温度较低时动态模量与频率呈明显对数相关性,当温度较高时动态模量与频率无明显对数相关性;Witczak预估模型在温度低于45℃时对沥青混合料动态模量的预估是可行的,但在较高温度条件下,由于动态模量偏低,其预估值偏差较大,精度还需要进一步提高。
Dynamic modulus tests on several commonly used bituminous concrete were carried out. The Witczak dynamic modulus prediction model was also verified. The experimental results show that the dynamic modulus of asphalt concrete decreases with the increase of temperature, and there is an obvious exponential relationship. The dynamic modulus of asphalt concrete increases with the increase of loading frequency. The dynamic modulus and frequency of asphalt concrete are obvious when the ambient temperature is low However, there is no significant logarithmic correlation between the dynamic modulus and the frequency at high temperature. The prediction of the dynamic modulus of the asphalt mixture by the Witczak model is feasible when the temperature is below 45 ℃, Temperature conditions, due to low dynamic modulus, the larger the deviation of the estimates, the accuracy needs to be further improved.