Spatio-temporal Distribution of Rutting Deformation of Cold Recycled Test Road with Asphalt Pavement
In order to reveal the mechanical behavior of cold recycled asphalt mixture in the structure and provide a reference for structural design in road maintenance,relying on the cold recycled asphalt pavement structure and field sensor monitoring data from an expressway test road in Shandong province,the dynamic response characteristics of cold recycled asphalt pavement under traffic load are analyzed.Based on the measured temperature field data,a viscoelastic finite element simulation model is constructed to analyze the rutting distribution of cold recycled asphalt pavement structures.The result shows that for the cold recycled asphalt mixture layer of the test road structure,the driving speed has a power function relationship with the duration of the internal strain response of structure.At the speed of 60-80 km/h,the mechanical response frequency inside the structural layer is close to 10 Hz.In pavement design,the dynamic modulus of the cold recycled mixture at 20 ℃ and 10 Hz can be adopted as the structural modulus.The distribution of hourly rutting volume in a day is mainly related to traffic volume in the cold recycled asphalt test road structure.The distribution of monthly rutting volume in a year is mainly related to temperature,the rutting accumulation within a year mainly occurs from May to October,and the rutting amount in winter can be almost negligible.In order to avoid excessive rutting predictions due to increased layer thickness,the thickness of asphalt layer needs to be limited when calculating the equivalent temperature for permanent deformation of the asphalt mixture layer.In addition,compared with the change of dynamic modulus at high temperature,controlling the plastic deformation development rate of the asphalt mixture in the upper and middle surface at about 40-45 ℃ shows a more significant effect in reducing the accumulation of pavement permanent deformation.
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