Porous asphalt mixture gap blocking experiment method

Abstract

The invention discloses a porous asphalt mixture gap blocking experiment method. The method comprises the following steps: firstly, designing grading and an oil-stone ratio according to a practical pavement, mixing to obtain a porous asphalt mixture indoor, forming a test piece, and sealing the lower surface of the test piece by wax; subsequently, uniformly paving blocking dust on the upper surface of the test piece, and applying a wheel load corresponding to a practical vehicle speed on the pavement to the upper surface of a pressure intensity washing test piece of the pavement by a washing experiment machine; and dividing the mass of blocking dust carried away by water and the mass of blocking dust left on the upper surface of the pressure intensity washing test piece from the total mass of paved blocking dust so as to obtain the mass of blocking dust inside the test piece. By the method, not only is the situation of blocking a porous asphalt pavement by dust grains with different sizes scientifically evaluated and is a good basis provided for pavement washing and maintenance, but also the influence of different conditions such as the porosity, the vehicle speed and the particle sizes of blocking dust grains to the blocking of the porous asphalt pavement can be analyzed, reasonable reference is provided for optimization on pavement maintenance, and the washing and maintenance effect is improved.

Description

technical field [0001] The invention relates to the technical field of highway asphalt pavement maintenance, in particular to a method for void blocking test of porous asphalt mixture. Background technique [0002] Porous asphalt pavement (Porous asphalt pavement) is the use of asphalt mixture with a large void ratio for the pavement surface as a drainage layer, and a densely graded mixture is laid under it as an impermeable layer, and the drainage layer and the impermeable layer are set. Pavement structure with waterproof binder course. The porosity of the porous asphalt mixture used in this pavement structure is generally between 18% and 25%. Discontinuous gradation is adopted to form a larger porosity and more connected voids in the mixture, so that the rainwater on the pavement can be quickly discharged. , improve the drainage performance of the pavement. [0003] Porous asphalt pavement originated in Germany. In 1960, Germany first used this material to build pavement...

AI Technical Summary

Problems solved by technology

[0005] However, because the porous asphalt mixture itself adopts a large void structure, the voids are easily affected by the blockage of dust particles during use. The void blockage is a more prominent problem of porous asphalt pavement compared with traditional asphalt pavement.

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