Method for evaluating attenuation degree of porous asphalt mixture void

Abstract

The invention discloses a method for evaluating attenuation degree of porous asphalt mixture void. The method is characterized by comprising the following steps: molding a plate test piece by rolling according to the grade of a porous asphalt mixture to be evaluated; coating a sealing material on three side faces and a bottom surface of the test piece to seal the surface voids, putting the test piece on a drainage coefficient tester, and taking a side face where the sealing material is not coated as a drainage channel; setting the testing slope of the drainage coefficient tester according to cross slope of the pavement, and testing to obtain an initial value of the drainage coefficient of the test piece; performing a wheel tracking test on the test piece, wherein the wheelmark track is required to be parallel to the drainage side face of the test piece during test; and after the wheel tracking test, testing the final drainage coefficient of the test piece by employing the drainage coefficient tester; comparing the final drainage coefficient with the initial value, and evaluating the attenuation degree of the porous asphalt mixture voids. The method can evaluate the attenuation degree of the porous asphalt pavement pore structure under the repetitive vehicle action and is used for selecting proper aggregate grading in the process of designing the porous asphalt mixture.

Description

technical field [0001] The invention belongs to the technical field of road engineering, and in particular relates to an evaluation method for void attenuation degree of drainage asphalt mixture under repeated action of vehicle load. Background technique [0002] In the asphalt pavement that has been built in our country, the surface layer mostly adopts the traditional forms of densely graded asphalt mixture and skeleton dense mixture. Whether it is a densely graded asphalt mixture with a porosity of about 4% or a skeleton-dense mixture with a porosity of about 8%, they are basically impervious to water, and it is easy to generate large water mist and water drift when driving in rainy days, seriously affecting vehicles. driving safety. On the other hand, due to the small porosity of the traditional asphalt pavement surface layer, large noise is likely to be generated between the tires and the road surface when the vehicle is running, causing serious noise pollution to the r...

AI Technical Summary

Problems solved by technology

However, the problem of the decay of the pore structure due to the repeated action of the vehicle load has not been systematically studied, especially what method to use to evaluate the decay of the internal voids of the mixture has not yet been resolved

Images