Study On Effects Of Ultraviolet Additives On Anti Ultraviolet And Road Performance Of Asphalt Mixture

In our country,94%of highway pavement is asphalt. With the implementation ofthe great development in western China, the highway mileage is increasing year afteryear in regions, and most of the regions are largely radiated by ultraviolet, which causedthe aging damage of asphalt pavement more and more serious. In this investigation, weadd the ultraviolet radiation additive into asphalt mixture, thereby research theultraviolet radiation aging of asphalt pavement.Through check information, market research and performance comparison, onechooses nano-TiO2and UV-531as ultraviolet radiation additive. According to theexperience of related research, we determine to add ultraviolet radiation additive by1%,3%,5%into asphalt mixture and then do the further research. We experiment withmineral and asphalt, then determine the graduation of AC-13and the optimumproportion (5.1%); we apply scrap oven to independently develop simulation chambersabout indoor ultraviolet aging, and based on the principle of that the amount of indooruv radiation is equals to that in the natural conditions, the unity relations about agingtime between the indoor radiation and natural radiation is established; finally, we mixasphalt, mineral and additive to make the mixture test-piece, then simulate the indoor uvaging to the test-piece, so we can study the pavement performance on the basis ofrutting test, splitting test and resilient modulus test.Results of the trial indicates: compare the original asphalt mixtures, when addnano-TiO2by3%, the dynamic stability, low temperature cleavage strength, andresilient modulus test of asphalt mixtures after aging raise27.56%,8.9%and10.6%respectively; when add UV-531by1%, the dynamic stability, low temperature cleavage strength, and resilient modulus test of asphalt mixtures after aging raise30.9%,6.5%and9.3%; The finite element software calculation results show that when we addnano-TiO2by3%and UV-531by1%respectively, there are smaller verticaldisplacement and smaller bottom layer tensile stress in the pavement structure, and thereis smaller maximum shear stress in the basic layer; At last, we recommend the addingdose of nano-TiO2is3%and UV-531is1%, and UV-531is deliverable for engineeringapplications because it is more inexpensive.