Multi-scale Analysis on Sustainable Service Performance of Expressway Drainage Asphalt Pavement
In order to study the influencing factors of drainage asphalt pavement performance,the comprehensive service performance of expressway drainage asphalt pavement is comprehensively analyzed.Based on the physical engineering of Yancheng-Jingjiang expressway overlaying drainage asphalt pavement,combined with sound absorption test,cooling test and other laboratory test evaluation,the characteristics of noise reduction,temperature reduction,drainage and skid resistance of PAV-13 rutting plates with different voids and thickness are analyzed.At the same time,the traffic accident data are investigated and analyzed by analyzing the on-duty record of the dispatching and commanding center of the road operation management system and the expressway safety management information during the past 4 a.The result shows that(1)the traffic noise can be reduced about 6 dB in the daytime and about 5 dB at night after the asphalt pavement is added in Yancheng-Jingjiang expressway,indicating that the asphalt pavement with drainage has a remarkable effect on reducing traffic noise,and absorb the high and low frequency noise between tire and road surface effectively;(2)the permeability coefficient of drainage asphalt mixture is obviously larger than that of dense-graded asphalt mixture,with every 2%increase of void ratio,the permeability coefficient increases by about 17%,and finally reaches 0.158 cm/s,showing the excellent drainage capacity;(3)it is worth noting that the critical water-sliding speed of drainage asphalt pavement is 9%-40%higher than that of dense-graded pavement,that means there is a higher speed limit in the case of water on the pavement,thus improving the road safety performance;(4)in addition,the investigation found that the drainage asphalt pavement can significantly reduce the traffic accident rate in rainy season,especially from March to August.Therefore,the excellent drainage performance and anti-skid performance of drainage asphalt pavement provides an important support for improving road safety.
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