摘要
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 deformation of asphalt pavement under vehicle loads can be characterized by creep tests under dynamic load. To study the effect of crumb rubber powder （particle） sizes and contents on high temperature viscoelasticity of asphalt mixtures, firstly, dynamic creep tests were conducted on different particle sizes and contents totaling 13 kinds of samples. Secondly,a ＂four u- nits and five parameters＂ model was modified with the application of the static and dynamic load e- quivalent and BOLTZMAN linear superposition principle. A dynamic creep viscoelastic model of as- phalt mixtures was proposed,and the model parameters can be solved with single iteration. The re- sults showed that creep deformation of asphalt mixture decreases with the incorporation of crumb rubber powder,the maximum deformation dmax of 30% contents （accounting for the quality of as- phalt） 80 mesh DCRMAM is smallest, resistance to high temperature deformation properties is stronger. With increase in the contents of rubber particles, the maximum deformation dm^x of asphalt mixtures decreases at first and then increases under the same conditions. The recommended contents of the rubber particles are controlled less than 93% （accounting for the qual There was a good relativity between the viscous flow strain and the total strain can reflect the dynamic creep viscoelastic properties of asphalt mixtures. ty of the asphalt）. the proposed model
出处
《内蒙古大学学报（自然科学版）》
CAS
CSCD
北大核心
2013年第6期647-653,共7页
Journal of Inner Mongolia University：Natural Science Edition
基金
西部交通建设科技项目(200731800093)
山西省交通运输厅科技计划项目(编号2011-1-1)
关键词
动蠕变
黏弹性
干法
橡胶
四单元五参数
dynamic creep
viscoelastic i dry-- blending
crumb rubber
four units and five parameters
