Research Of Aging Characteristic Of SBS Modified Asphalt Under Coupling Condition Of Heat And Light

As the growth of the economy and the development of science and technology,the transportation is developing rapidly, more and more new roads were built.Atpresent, the highway`s pavement almost is asphalt pavement.As the growth of thepavement`s fservice life,a it would produce a variety of diseases, seriously affect thecomfort of driving and traffic conditions, the asphalt aging is the main cause of roaddiseases. Asphalt regeneration technology can reuse the waste asphalt mixture causedthe large and medium repairing engineering of road. Only understand the mechanismof asphalt aging, we can better to reuse the waste asphalt mixture. The thermal agingstudy of asphalt has been relatively mature,but it`s has not systematic research udercoupling condition of Heat,Light. Especially the study of SBS modified asphalt undercoupling condition.This article used the aging equipment of dependent development that asphaltcoupling condition aging test chamber to study the coupling condition aging propertiesof SBS modified asphalt. Chosed six kinds of asphalts, Respectively test these aspaltsunder the coupling condition, test the performance of the asphalt before and after aging.Through three index test, The results showed that under the coupling condition ofasphalt aging effects more seriously than thermal aging, And with the increase of lightintensity of ageing effect is more seriously. Through the experiment, and put forwardthe contribution rate of asphalt, As can be seen from the contribution rate, under thedifferent light intensity, temperature on the contribution ratio of asphalt aging isdifferent, At low light intensity, the asphalt performance attenuation of contributionrate is as high as70%of temperature, the temperature is the main cause of asphaltaging; And with the increase of light intensity, temperature, the contribution rate of theasphalt performance attenuation decreases, the light intensity of40w/㎡, accountedfor45%, the role of uv light on aging. Through DSR test found that the matrix asphaltand SBS modified asphalt after aging test, but at the same temperature thermalcoupling with the increase of aging time under the complex modulus increase gradually,And the phase Angle was decreased regularly. Rut factor increased with the increase ofaging time, high temperature rutting resistance increased. By BBR test found that sixkinds of asphalt aging power thermal coupling degree modulus has a corresponding degree rise, Lower the low temperature performance of asphalt aging. The agingproperties of the modified asphalt by the comprehensive analysis, the results show thatadding SBS modifier of asphalt after aging resistance performance improved.Two test by infrared spectrum and comprehensive thermal analysis method tostudy the the microstructure characteristics of SBS modified asphalt under couplingcondition of heat and light. Through infrared spectrum experiment, found the asphaltafter aging carbonyl functional groups and carboxyl functional groups, Modifiedasphalt in butadiene in the conditions of field gradually reduced, small moleculargroups to large groups of asphalt. Through the DSC curve,found that the absorbedheata reduced and high temperature stability improved of aging asphalts.