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为了建立能够表征组分材料性能及细观结构特征的沥青混合料动态模量预测模型,根据复合材料细观力学理论,将沥青混合料视为由沥青胶浆包裹的集料颗粒嵌入于有效沥青混合料介质中的复合材料,考虑集料尺寸、级配组成和空隙的影响,建立了沥青混合料动态模量三相细观力学预测模型。结合组分材料性能研究,应用该预测模型求解得到了动态模量,其与试验值比较结果表明,预测值较试验值小,产生此差异的原因可归结为模型的适用条件与真实细观结构的差别;据此对预测模型进行了修正,提出了考虑沥青膜厚度的动态模量细观力学分析方法;鉴于集料与沥青胶浆之间的力学特性差异,简化了预测模型求解参数,给出了参数值的范围。
In order to establish the predictive model of dynamic modulus of asphalt mixture that can characterize the properties of materials and the microstructure of the mesostructures, according to the theory of meso-mechanics of composite materials, the asphalt mixture is regarded as agglomerated particles of asphalt cement embedded in effective asphalt Considering the influence of aggregate size, gradation composition and voids, a three-phase micromechanical prediction model of dynamic modulus of asphalt mixture was established. Based on the study of the properties of the component materials, the dynamic modulus was obtained by using the prediction model. The comparison with the experimental results shows that the predicted value is smaller than the experimental value. The reason for the difference can be attributed to the application of the model and the true meso-structure Based on this, the prediction model was modified and the meso-mechanics analysis method of dynamic modulus considering the thickness of asphalt film was put forward. In view of the differences of mechanical properties between aggregate and asphalt mortar, the parameters of the prediction model were simplified, Out of the range of parameter values.