Process parameters of the high-compactness paving of an asphalt pavement

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (2) : 240-245.

SHI Yanni1， LIU Honghai1, GAO Xinmin2,3, YANG Yongqiang2,3, GUO Hongjun3

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Abstract

In order to improve the paving compactness of asphalt pavement and the efficiency of paver construction, a dynamic model of the vibration system of screed-asphalt mixture interaction which considered the material properties and paving compaction effort is presented. The influence rule of vibration parameter of screed on the asphalt pavement compactness was analyzed, and the technological parameter range of high compactness paving of asphalt pavement were obtained. Based on the mechanical resonance theory, the nonlinear dynamic model of compacting mechanism of screed was established. The equivalent stiffness and damping were used to represent the compacting force of asphalt mixture obtained in the process of paving compaction, the amplitude amplification factor β was used to express the magnitude of the amplitude, the theoretical model of paving compactness trend and vibration frequency was obtained. By analyzing the model, the effects of vibration parameters and material properties on the paving compactness was obtained, the parameter range of high-compactness paving was determined. The high efficiency compaction zone of technological parameter was verified by field test. The results indicate that the frequency ratio range corresponding to high density paving of asphalt pavement is λ=0.9-1.41; The high efficiency compaction zone of continuous gradation asphalt mixture AC-20 paving frequency is 33Hz ~ 49Hz; the variation rule of the simulation results is basically consistent with the test results, the model has validity. The research results are helpful to improve the compactness of asphalt pavement, improve pavement quality, save construction cost, and provide a basis for effective compaction of asphalt pavement.

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mechanical engineering / screed / asphalt mixture / dynamical model / compactness

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SHI Yanni1， LIU Honghai1, GAO Xinmin2,3, YANG Yongqiang2,3, GUO Hongjun3. Process parameters of the high-compactness paving of an asphalt pavement[J]. Journal of Vibration and Shock, 2022, 41(2): 240-245

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