Research On Ultraviolet Aging Asphalt Mixture Based On The The Micromechanics

Ultraviolet aging is one of the major forms of aging in strong UV irradiationof asphalt pavement. Today, researchers paid more attention on the asphalt binderor the asphalt mixture macro-road performance. Based on micromechanics, themicro-mechanical performance of UV aging asphalt mixture is discussed with itsunder different influencing factors. Combined with road performance and anti-UVaging asphalt mixture material design is promoted about strong UV region.This paper analyzes the partition of the solar radiation intensity and UVirradiation of radiation on the asphalt pavement. Establish indoor accelerated UVaging chamber by the appropriate choice of indoor simulated UV irradiation lightsource.In order to get the required parameters of numerical mode,tar sands uniaxialcompression creep tests are made. According to the test results to fit a differentlight, different aggregate gradation and asphalt content tar sands Burgers modelwith four parameters.UV aging asphalt mixture aging evaluation based on thefitted parameters with aging time relationship. To establish the parameters of thenumerical model, the parameters can be converted micromechanical parametersfor the establishment of a numerical model and virtual test.The results showedthat AC-13S1and AC-16S1gradation have minimum viscoelastic ratios andAC-13II (5.5%) and AC-16II (5.5%) have minimum viscoelastic ratio. UV agingasphalt mixture aging evaluation J (h,1200) is proposed by different aging timeand the viscoelastic parameters.Create a two-dimensional asphalt mixture numerical model using discreteelement program, and do virtual uniaxial creep under these different influencing factors tests based on a combination of different illumination time, different setGradation and asphalt content micromechanics parameters. Acquire strain, normalcontact forces between the particles and shear contact force of before and afterUV aging asphalt mixture through the virtual test. Find different influencingfactors on the performance of asphalt mixture by analyzing these micromechanicscharacteristics. Minimal change AC-13S1and AC-16S1gradation, AC-13II andAC-16II are proposed by less change in micro-contact force before and afteraging.In order to verify the anti-UV material aging asphalt mixture design methodbased on micromechanics study, and get the corresponding material designmethod based on macro-Road Performance of, the low temperature crackresistance and high temperature stability studies under diffirent factors.Recommend reasonable material designed for AC-13S1and AC-16S1gradationand aggregate ratio (5.5%).