Research On Fatigue Properties Of Reclaimed Asphalt Mixture From Central Plant

Regeneration of waste asphalt mixture are applied to the asphalt pavementcontruction and maintenance,not only can save the materials, cost and energy,also helpsto solve the problem of waste disposal.Due to the complexity of reclaimed asphaltmixture composition,and inherit traffic and climate factors in the process ofcombination, reclaimed asphalt pavement will apper the fatigue damage.In thispaper,relying on Chongqing science and technology research project “research on thekey technology and application of waste asphalt mixture circulation heatregeneration”,according to two different kinds of waste asphalt mixture,analyzed theindirect tensile fatigue characteristics of reclaimed asphalt mixture,provide reference forthe study of the regeneration asphalt pavement.Based on recycling and determination of two kinds of waste asphalt mixture,determine the asphalt content and gradation of old mixture.At the same time, newasphalt and aggregate used in the reclaimedasphalt mixture are tested.Marshall designmethod is sdopted to determine the mix design of reclaimed AC-16and AC-13whichRAP mass fraction were0%,10%,30%,50%of the mixture ratio.Based on stress control asphalt mixture fatigue experimental Study,uses thesplitting strength test and indirect tensile fatigue test method,reclaimed asphalt mixturefatigue equation is put forword through test under different influencing factors.Andanalyzed the RAP mass fraction,stress ratio, test temperature,aging simulation,differentRAP material and types of the reclaimed asphalt mixture such as factors changes on thesplitting strength of reclaimed asphalt mixture and the impact of indirect tensile fatiguetest results. This paper introduces the fatigue life ratio Nf (k/n) and fatigue life lossratio F (k), to systematically analyze the variation of the fatigue properties of thereclaimed asphalt mixture.Through the analysis of reclaimed asphalt mixture strength test results put forwordthe reclaimed asphalt mixture,the Splitting strength and the compressive modulus ofresilience of recommended values.And put forward reclaimed asphalt mixture fatiguelife prediction model according to the results of the fatigue test,and recommend tensile strength structure coefficient of reclaimed asphalt mixture.