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Fatigue Performance Analysis of Pavements with RAP Using Viscoelastic Continuum Damage Theory
Yizhuang David Wang,Behrooz Keshavarzi,Youngsoo Richard Kim 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.6
This paper presents the results of a study to evaluate the fatigue performance of pavements that contain RAP materials. The studyis based on two different accelerated loading tests conducted in the United States. Each of these two projects has correspondingpavements with and without RAP mixtures that were constructed over the same aggregate base and subgrade and subjected to thesame traffic loading and environmental conditions. The primary reason for selecting these two projects is that they exhibited oppositetrends in a comparison of the fatigue cracking performance of their pavements with and without RAP. The asphalt mixtures in the testpavements were characterized using the simplified viscoelastic continuum damage model. The fatigue cracking performance of thepavements was then modeled using the characterized material properties, in situ pavement structures and traffic loads, and climateconditions in FlexPAVE™, a three-dimensional layered viscoelastic finite element program with moving load analysis. The resultantfatigue cracking performance predictions matched the field observations well. Both the simulation results and the field observationsalso showed that the fatigue cracking performance of the asphalt mixtures that contained RAP materials differed according topavement structure and the fatigue cracking-resistant quality of the RAP mixtures.
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