Abstract
Drainage asphalt pavement provides excellent drainage performance and driving safety, where the permeability of the pavement is the critical performance. When analyzing the permeability of drainage asphalt pavements, the previously used two-dimensional infiltration calculation model with boundary conditions deviates from the real situation. In this article, a three-dimensional infiltration finite element method was proposed to evaluate the permeability of pavement, and the feasibility of the three-dimensional infiltration finite element method to evaluate the drainage capacity of drainage asphalt pavement was verified by using the single-sided permeability test of indoor rutted slabs of drainage asphalt mixtures as an example. Finally, the effects of the longitudinal slope of the pavement on the drainage performance of the drained asphalt pavement was investigated by calculations based on the three-dimensional infiltration finite element method. The results indicated that: when the longitudinal slope was less than 6%, the influence of longitudinal slope size on the drainage capacity of drainage asphalt pavement was very small. When the gradient of the longitudinal slope from 0 to 6%, the critical drainage capacity of the pavement corresponding to each cross slope was maintained at a relatively stable value.
Highlights
Known as permeable asphalt pavement, refers to a new type of asphalt mixture surface layer that has a porosity of about 15–23% after compaction and can form a drainage channel inside the asphalt mixture [1]
Since the synthetic slope is the result of the combined effect of the transverse and longitudinal slopes of the road [29,30,31,32], the critical drainage strength of the pavement was calculated for the transverse slope of 1 and 4% corresponding to different longitudinal slopes (0–6%), respectively
The rut board lateral permeability coefficient tester based on the principle of normal head test had good sealing performance, which was convenient for indoor measurement of the permeability coefficient of drainage asphalt mixture, and the test results were stable and reliable
Summary
Known as permeable asphalt pavement, refers to a new type of asphalt mixture surface layer that has a porosity of about 15–23% after compaction and can form a drainage channel inside the asphalt mixture [1]. Different from the dense structure of the traditional pavement, the drainage asphalt pavement mostly uses large void asphalt mixture as the drainage surface layer [3]. The middle and lower asphalt surfaces of the drainage surface layer are dense asphalt mixture, which can form a drainage channel inside the asphalt mixture. In this way, the water seeping into the drainage layer on rainy days can be discharged out of the pavement structure along the pavement slope [4,5,6]. Fully understanding and effectively determining the permeability of drainage asphalt pavements is the key to successful application of drainage asphalt pavements
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