不同RAP掺量沥青混合料动态模量性能研究

Study on Dynamic Modulus Properties of Asphalt Mixtures with Different RAP Contents

摘要:

为评价不同RAP掺量下再生沥青混合料的动态模量性能，作为再生沥青路面养护设计时期的设计参数依据，选用AMPT 沥青混合料性能试验仪，测试了RAP掺量分别为0%、10%、15%和30%的再生沥青混合料动态模量E*和相位角φ，并以此阐述了RAP掺量对再生沥青混合料力学性能的影响规律；同时通过2S2P1D模型建立再生沥青混合料动态模量主曲线，探讨了RAP掺量与其动态力学参数的相关性。研究数据显示：同一加载频率下，再生沥青混合料的动态模量随着RAP掺量的增加而增大；当试验温度达到35 ℃时，30%RAP掺量的再生沥青混合料动态模量开始降低，动态力学响应开始变差，综合考虑RAP掺量控制在30%以内较好；基于2S2P1D模型建立的再生沥青混合料动态模量主曲线相关系数R²大于0.98，拟合度较好，说明可将现有的试验温度和加载频率扩展至更宽的范围，为不同应用环境下再生路面质量控制提供依据。

Abstract:

To evaluate the dynamic modulus properties of recycled asphalt mixtures with the different RAP contents, as a design parameter basis for maintenance and design of recycled asphalt pavement, the asphalt mixture property tester (AMPT) is used to test the dynamic modulus E* and phase angleφof recycled asphalt mixtures with RAP contents of 0%, 10%, 15% and 30%. And based on this, the influence law of RAP content on the mechanical properties of recycled asphalt mixture is expounded. Meanwhile, the dynamic modulus master curve of the recycled asphalt mixture is established through the 2S2P1D model to discuss the correlation between RAP content and its dynamic mechanical parameters. Research data indicate that the dynamic modulus of recycled asphalt mixtures increases with the increase of RAP content at the same loading frequency. When the test temperature reaches 35 °C, the dynamic modulus of recycled asphalt mixtures with 30% RAP content begins to decrease, and the dynamic mechanical response begins to deteriorate. Taking all factors into account, it is better to control the RAP content within 30%. Based on the 2S2P1D model, the correlation coefficient R² of the principal curve of the dynamic modulus of the recycled asphalt mixture established is greater than 0.98, and the fitting degree is good. It is indicated that the existing test temperature and loading frequency can be extended to a wider range, providing a basis for the quality control of recycled pavement in different application environments.