Study On The Road Performance And Rutting Numerical Simulation Of Warm Mix Thiopave Asphalt Pavement

The rutting damage phenomenon is one of the asphalt pavement common diseases,not only the road rutting disease is difficult to repair,the damage will extend to the middle and lower layer from the surface layer,which is why road researchers take the rutting problem into consideration in the prevention and control of asphalt pavement damage.Therefore,this paper take improvement of asphalt pavement rutting as the starting point,study the mix proportion design and road performance of Thiopave special asphalt mixture through laboratory tests,simulate the rutting numerical simulation of the Thiopave special asphalt mixture applied to the pavement upper layer by the finite element software ABAQUS,provide a research direction for the asphalt pavement rutting in China.The main conclusions of this paper are as follows:(1)The sulfur bitumen cementation optimum content of AC-13 type warm mixed Thiopave special bitumen mixture is 5.8%and obtained by Marshall test,it is found that the Thiopave modifier has a certain improvement on the physical and mechanical properties of asphalt mixture.(2)After adding Thiopave modifier in asphalt mixture,The Thiopave asphalt mixture has better superior high-temperature stability than ordinary asphalt mixture through rutting test.It was found that using the Thiopave modifier did not reduce the low temperature crack resistance and water damage of mixture through trabecular bending test,immersion Marshall test and freeze-thaw splitting test.(3)Carrying out the numerical simulation of asphalt pavement temperature field By ABAQUS software,the asphalt pavement structure is influenced by the solar radiation and the atmosphere temperature,and the temperature in the asphalt pavement structure presents a periodic change law.The highest temperature of asphalt pavement structure appear in road pavement surface,with the increase of the road depth,the highest temperature appear time of the asphalt pavement structure is relatively lagging behind the atmospheric temperature,the time of the temperature starts to fluctuate is also increasing,the temperature fluctuate amplitude and rate are far below the road surface temperature.(4)Carrying out the numerical simulation of asphalt pavement rutting By ABAQUS software,the rutting of Thiopave asphalt pavement increases with the increase of temperature,the rutting of Thiopave asphalt pavement is much smaller than that of ordinary asphalt pavement caused by temperature.With the gradual increase of tire pressure,the rutting produced by the Thiopave asphalt pavement is less than that of the ordinary asphalt pavement,and the rutting increase of the ordinary asphalt pavement is more obvious.The rutting of the Thiopave asphalt pavement and the common asphalt pavement is close before the 10~4 times of cyclic loading,but the rutting increase of ordinary asphalt pavement is obviously greater than that of Thiopave asphalt pavement after 10~4 times of loading.Under the condition of high temperature and heavy load,for the Thiopave asphalt pavement,with the increase of load times,the maximum shear stress and the maximum shear strain increase quickly at an early stage,while the latter gradually becomes stable.The rutting of the Thiopave asphalt mixture applied to the upper layer is 1.6mm more than that applied to the middle layer,the maximum shear stress of two kinds of pavement structure forms have not much difference.Analyzing the linear regression analysis of the rutting depth of Thiopave asphalt pavement with temperature,tire pressure and loading times by IBM SPSS software,getting the rutting prediction formula.