Study On The Relationship Between High Temperature Stability And Viscoelastic Property Of Rubber Powder Modified Asphalt Mixture

Asphalt pavement will produce or deep or shallow permanent deformation under the effect of high temperature and repeated loads of vehicles.In this case,the viscoelastic behavior is more prominent,and the rutting or permanent deformation of asphalt pavement is the direct reflection of the malelasticity of asphalt mixture.The study of viscoelastic property of asphalt mixture is the key point in the field of road materials.Based on the mathematical theory,the mechanical characteristics of viscoelastic materials can be used to characterize the diseases caused by the lack of high temperature stability of the materials in the construction of engineering construction,and the rubber powder modified asphalt mixture as a kind of pavement material which can reduce the impact of waste tyres on the ecological environment,and improve the performance of the asphalt mixture in the performance,it is necessary for the study of high temperature stability and viscoelasticity.Therefore,this paper studies the relationship between high temperature stability and viscoelastic property of rubber powder asphalt mixture.(1)Different mesh and different dosage of rubber powder modified asphalt mixture was designed for indoor rutting test by using dry and substitution method.Dynamic stability was selected as evaluation index to judge the high temperature stability of rubber powder modified asphalt mixture.The best mesh and the best dosage of rubber powder modified asphalt mixture was selected under the condition of the optimal evaluation indexes.(2)The viscoelastic model was analyzed theoretically to derive the creep equation and the study creep behavior.The pros and cons of all kinds of viscoelastic models were analyzed to choose the four-unit five-parameter model as the object of the study.(3)Dynamic creep test was selected as test method by using spin forming method of compaction.Different mesh and different dosage of the rubber powder modified asphalt mixture was used in dynamic creep test under the same load conditions anddifferent temperature.It is concluded that the rubber powder modified asphalt mixture of creep curve and the maximum displacement.(4)The creep equation of the four-unit five-parameter model was combined to fitt the creep curve of dynamic creep test.The viscoelastic parameters of the four-unit five-parameter model were extracted to carry out the sensitivity analysis of viscoelastic parameters.Based on the theoretical derivation of the dynamic stability formula,the mathematical formula and dynamic stability of the dynamic stability and viscoelastic parameters were obtained.Comparing the test values with the calculated value,the results show that the calculated value is close to the test value,and the dynamic stability of the asphalt mixture is estimated.