The Performance And Mechanical Response Of Asphalt Rubber And SMA Composite Pavement Structure

Due to the economic boom, asphalt rubber production has been multiplied inChina which leads to more and more serious issues as environmental pollution andenergy dissipation. Fortunately, application of modifier made from scrap tire in roadengineering works as an effective solution to the problem.With SMA (rubber mastic asphalt gravel mixture) on the Cement concrete baseand Stress absorbed layer construction in the middle, asphalt rubber and SMAcomposite pavement has excellent high and low temperature quality. Its advantagescan be concluded as following: firstly, it enhances road’s resistance against reflectioncrack, aging, and noise greatly; secondly, it improves road’s quality and extends itsservice life; lastly, it is energy-saving and requires no fiber which cut down thematerial cost. Until now, there are few researches upon asphalt rubber and SMAcomposite pavement structure in China. Therefore, a comprehensive analysis of thestress response of SMA compound of asphalt rubber pavement structure is of greatsignificance to the application of scrap tire rubber powder in road engineering and thestudy of road’s long service life.Referring to both domestic and abroad relevant documents and researches, thispaper conducts a detailed analysis of the modification mechanism of asphalt rubberand the properties and its influencing factors of asphalt rubber and SMA compositepavement structure. Focusing on asphalt rubber and SMA composite pavementstructure, initially, based upon elastic multi-layer system theory, this paper establishan appropriate three-dimensional finite element model through application ofABAQUS software; secondly, it analyzes the load mechanical response of asphaltrubber and SMA composite pavement structure respectively through finite elementmodel calculation. Moreover, it analyzes the influence parameter variations have uponmechanics responses through finite element numerical simulation of asphalt rubberand SMA composite of the pavement structure in terms of the numerical simulation;lastly, temperature stress mechanical response of SMA compound of asphalt rubberpavement structure. It analyzes asphalt rubber and SMA composite pavementstructure’s stress response under a certain temperature gradient conditions throughfinite element numerical simulation.