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动荷载作用下的蠕变试验能够表征沥青路面在行车荷载作用下的变形状态,为了研究橡胶粉(颗粒)粒径尺寸和掺量对沥青混合料高温黏弹性能的影响,首先对不同粒径尺寸和掺量共13种工况下的干法橡胶沥青混合料进行动蠕变试验.其次,通过动静荷载等效以及BOLTZMAN线性叠加原理的应用对“四单元五参数”模型进行改进,提出能够单次迭代求解的沥青混合料动蠕变黏弹性模型,并对模型参数进行分析.结果表明:橡胶粉的掺入使得相同加载次数下沥青混合料的蠕变变形量降低,30%掺量(占沥青质量)下80目橡胶粉沥青混合料的最大变形量dmax最小,抗高温变形性能较强;随着橡胶颗粒掺量的增加,相同条件下沥青混合料的dmax呈先低后高的趋势,建议橡胶颗粒的掺量控制在93%以内(占沥青质量).模型表征的黏性流动应变与总应变相关性良好,提出的模型可以较好地反映沥青混合料的动蠕变黏弹性能.
The creep test under dynamic load can characterize the deformation of asphalt pavement under driving load. In order to study the influence of particle size and content of rubber powder on the viscoelasticity of asphalt mixture at high temperature, Size and content of dry rubber asphalt mixture under 13 conditions were used for dynamic creep test.Secondly, through the application of dynamic and static load equivalent and BOLTZMAN linear superposition principle, the “four elements and five parameters” model was improved, The creep viscoelastic model of asphalt mixture, which can be solved by single iteration, is proposed and the model parameters are analyzed.The results show that the creep deformation of asphalt mixture decreases with the addition of rubber powder, The maximum deformation (dmax) of 80-ton rubber powder asphalt mixture is the smallest, and the deformation resistance is high under the same amount of asphalt rubber (asphalt content). Under the same conditions, the dmax of asphalt mixture is low and high , It is suggested that the content of rubber particles should be controlled within 93% (asphaltene content) .The model shows that the correlation between the viscous flow strain and the total strain is good, and the proposed model can better reflect the asphalt mixture Dynamic viscoelastic creep energy.