Study On Pavement Performance Asphalt And Asphalt Concrete Of Light And Heat Ageing

With the rapid development of the national economy, our country's transportation vehicles are swift and violent,particularly, highway overload and overload are serious. Asphalt pavement performance have becoming increasingly demanding. However the asphalt took place the volatility, oxidation, decomposition, aggregation and other physical chemical changes in high temperature and the oxygen effecttion, the main factors.is that sunlight, oxygen induce the aging asphalt and asphalt pavement performance degradation.This paper studuy the optical oxygen factors on the asphalt and asphalt concrete performance and discuss Asphalt's and asphalt concrete's Rules of evolution in the optical oxygen aging, which provide a reference for asphalt pavement designed in high-radiation areas.Consulting the domestic and foreign related research results, this papers select three kinds of modified asphalt which are Sasobit, SBSandCrumb Rubber Modified Asphalt. Using convention instrumentation, Dynamic shear rheometer, Bending beam rheometer, FT-IR Spectrometer and Other detection methods, this papers study asphalt pavement performance, chemical structure and rheological properties in the heat of oxygen and photo-aging. The results show that the hot oxygen and the light aging make the asphalt viscosity and high-temperature performance to increase and reduce temperature sensitivity. After the aging ,asphalt appeare carbonyl and sub-sulfone functional groups and produce more relatively large molecular asphaltene. Aging increases the asphalt composite shear modulus G* and reduces the phase angleδ, which make asphalt flexibility enhanced.The research discover that Asphalt stiffness modulus S is increased and the creep stiffness value of the slope m is decreased. After the aging, The relaxation properties of asphalt is becoming bad, SBS modified asphalt anti-aging properties is better than two other modified asphalt.This article selects the SBS modified asphalt which mix asphalt concrete (AC-13).By low-temperature bending and Bending fatigue other test which study asphalt mixture properties after aging.The results show that short-aging make low-temperature bending strength increase 2.3%and bending strain reduce 12.2%.As increaseing the aging temperature sunlight-ageing, Low-temperature bending is less 2.3% than the original and bending strain is less 6.9% than the original.As the stress increasing the aging asphalt concrete to resists the distortion ability is gradually become smaller.With the increasing degree of the aging asphalt concrete,which make the aging asphalt concrete's sensitivity of strain to increase.By studying SBS modified asphalt mixture short-term aging and light-aging properties,the results Show that SBS modified asphalt as a cementing material is able to meet the high radiation areas of pavement functional requirements.This papers suggest that the high radiation areas select SBS modified asphalt as a cement material.