Experimental device and experimental method for measuring drainage performance of porous asphalt mixture

Abstract

The invention discloses an experimental device and an experimental method for measuring the drainage performance of a porous asphalt mixture. A simulating rainfall condition is simulated by utilizingan experimental device, and the anisotropy of a seepage process in a test piece is characterized by utilizing a drainage anisotropy coefficient by measuring water discharge amounts of the porous asphalt mixture test piece in transverse and longitudinal section directions under different rainfall intensities based on a hydraulics theory. The maximum water discharge amount under the condition that no accumulated water exists on a surface is obtained by adjusting the rainfall intensities. A retention water amount in the test piece is obtained by testing the mass change of the test piece before and after an experiment, and semi-connected gaps in the test piece are quantified. The evaluation of the water discharge performance of the porous asphalt mixture test piece is realized by adopting indexes such as the drainage anisotropy coefficient, the maximum water discharge under the condition of no accumulated water and the semi-connected gas ratio in the test piece and the like. According to the invention, a standard asphalt mixture test piece formed indoors or sampled on site can be used for testing, and the water discharge performance of the porous asphalt mixture test piece under different rainfall conditions can be objectively evaluated.

Description

technical field [0001] The invention relates to the technical field of indoor testing and evaluation of the permeability of asphalt mixture, in particular to an experimental device and a test method for measuring the drainage performance of porous asphalt mixture. Background technique [0002] The reasonable and accurate measurement of the drainage performance of porous asphalt mixture through laboratory tests can effectively guide the design and optimization of porous asphalt pavement. The horizontal scale of the road drainage surface is much larger than the vertical scale. The water seepage test method recommended by the current code cannot characterize the seepage anisotropy on the horizontal scale. The impact of capacity cannot be ignored; secondly, in order to ensure the anti-skid performance of the wet road surface in rainy days, it is very important to measure the maximum displacement of the road surface without water accumulation to enhance driving safety; finally, t...

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Problems solved by technology

The water seepage tests (constant water head test and variable water head test) designed by existing scholars lack the true reflection of the rainfall process, and thus cannot evaluate the maximum drainage of porous asphalt pavement under actual rainfall conditions; in the simulation analysis of the drainage process, Because it is impossible to accurately quantify the water seepage process inside the asphalt mixture, it is usually assumed that the water seepage performance of the asphalt mixture is isotropic or the water seepage capacity in different directions has a certain multiple relationship. main reason for the difference

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