Research On Deformation Performance Of Modified Asphalt Mixture

At present，the highway career has made a great progress in our country, more than90%of existing highway use asphalt concrete pavement, asphalt pavement shows obviousadvantages,but at the same time it also shows a lot of ills, for example,the early damagephenomenon of asphalt pavement is very serious. This phenomenon is caused by the lackof resistance to deformation, during the normal use, the vehicle, severe overloadphenomenon, or emergency braking will produce the shear stress on the surface, if theshear resistance of asphalt mixture is lacking the shear failure will occur, which will causewheel rut, uplift, packages, and other forms of damage caused by deformation, thesephenomena have great effect on normal use of the asphalt pavement. At present, manydomestic and foreign scholars have done extensive research on the ability to resistdeformation, and put forward a series of evaluation index, but the problem has not beensolved completely so far.Rubber powder modified asphalt is a new kind of pavement material that appears inrecent years, judging from the study of scholars, we know that Rubber powder modifiedasphalt can reduce the phenomenon of low temperature cracking, the deformation ofrutting flow, noise, and it also can prolong the service life of asphalt pavement, what′smore,it makes use of waste rubber tires, which can reduce pollution, protect theenvironment and achieve circular economy.This article starts from the shear performance of asphalt mixture, and by using triaxialshear test at room temperature, we can get the shear index C and of rubber powdermodified asphalt mixture and SBS modified asphalt mixture, then, we can evaluate twodifferent shear performance of modified asphalt mixture through the comparison.Inaddition, by doing uniaxial and triaxial creep test, this article evaluate from another aspect.The text is about the rubber powder modified asphalt and SBS modified asphalt mixture,then by using the creep deformation curve, plateau slope and mixture stiffness modulus, wecan evaluate the ability to resist deformation of two kinds of mixture. In the text, we set updifferent temperature (15℃,30℃and45℃) and different load stress (0.7MPa,1.0MPaand1.3MPa) to reflect the ability to resist deformation of asphalt mixture under differenttemperature and load stress. At last, we can safely draw the conclusion that the rubberpowder modified asphalt mixture has better performance in the resistance to deformation capacity and resistance to super overloading than the common SBS modified asphaltmixture.This article does the analysis of finite element simulation about the triaxial creep testsby using ABAQUS, we can find that the results of simulation and experimental have goodcorrelation, which proves that the analysis method is correct.