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将沥青混合料看作是由沥青砂和粗骨料组成的两相复合材料,提出了应用自洽方法预测沥青混合料粘弹性性能的一般思路。采用四参量流变模型描述沥青砂的粘弹性能,通过Laplace变换将时间域的粘弹性问题转化为变换域的线弹性问题,然后经Laplace逆变换将变换域的解转化到时间域。利用不同温度、不同应力水平下沥青砂的单轴压缩蠕变实验,拟合四参量流变模型参数,预测了沥青混合料在不同温度和不同应力水平下的蠕变曲线,并与实验结果进行了比较,发现蠕变的早期阶段预测值与实验值基本符合。最后进一步分析了温度、应力水平对沥青混合料蠕变行为的影响。
The asphalt mixture is regarded as a two-phase composite material composed of asphalt sand and coarse aggregate. A general idea of applying the self-consistent method to predict the viscoelastic properties of asphalt mixture is proposed. The four-parameter rheological model is used to describe the viscoelastic properties of tar sands. The Laplace transform is used to transform the viscoelasticity of the time domain into the linear elastic problem of the transform domain. Then the Laplace transform transforms the transform domain into the time domain. The uniaxial compressive creep experiments of tar sands at different temperatures and different stress levels were used to fit the parameters of the four-parameter rheological model. The creep curves of asphalt mixtures at different temperatures and different stress levels were predicted and compared with the experimental results In comparison, it is found that the predicted value of creep in the early stage basically agrees with the experimental value. Finally, the influence of temperature and stress level on the creep behavior of asphalt mixture is further analyzed.