沥青混合料动态模量预测模型的验证与分析研究

摘要

测定了2种典型级配类型的基质沥青和SBS改性沥青混合料的动态模量,利用NCHRP 1-37A模型和NCHRP 1-40D模型对沥青混合料的动态模量进行预测,对比2种预测模型对不同种类沥青混合料动态模量预测的准确性,针对NCHRP 1-37A模型对改性沥青混合料动态模量预测效果不理想的问题,对NCHRP 1-37A模型进行了修正.结果表明,NCHRP 1-40D模型能够准确的预测基质沥青混合料的动态模量,修正后的NCHRP 1-37A模型可以较好地预测改性沥青混合料动态模量.%In this paper, the dynamic modulus of two typical types of matrix asphalt (unmodified-asphalt mixture) and SBS-modified-asphalt mixture are determined.By using NCHRP 1-37A model and NCHRP 1-40D model, the dynamic modulus of asphalt mixtures is predicted, and the prediction accuracy of two prediction models for different types of asphalt mixture is compared.In view of the problem that the prediction accuracy of NCHRP 1-37A model for SBS-modified-asphalt mixture is unsatisfactory, the NCHRP 1-37A model is revised.Results show that the NCHRP 1-40D model could predict the dynamic modulus of unmodified-asphalt mixture accurately and the accuracy of NCHRP 1-37A model for SBS-modified-asphalt mixture is further enhanced by introducing a local calibration factor.