Drainage asphalt mixture optimization design method based on composition mechanism

Abstract

The invention discloses a drainage asphalt mixture optimization design method based on a composition mechanism. The method comprises the following steps: (1) setting a target void ratio, and carryingout grading trial; (2) selecting a corresponding asphalt film thickness according to the type of the used high-viscosity asphalt and the nominal maximum particle size, and estimating the asphalt consumption; (3) checking a skeleton structure, sequentially checking a local skeleton and a global skeleton of each primary gradation according to a gradation skeleton theory suitable for the drainage asphalt mixture, and determining a gradation coarse aggregate part; (4) inspecting the void structure, forming a Marshall test piece, sequentially inspecting the void ratio and the effective void ratio according to the effective void ratio requirements of different nominal maximum particle sizes PAC, and determining optimal gradation; (5) determining the optimal asphalt-aggregate ratio, and inspecting asphalt coating; and (6) performing a performance test, and verifying the pavement performance. According to the method, each design link corresponds to each key performance, optimization and adjustment can be carried out in a targeted manner, and the test time and consumables are saved while the design quality of the drainage asphalt mixture is ensured.

Description

technical field [0001] The invention relates to the technical field of road engineering, in particular to an optimal design method for drainage asphalt mixture based on composition mechanism. Background technique [0002] Drainage asphalt pavement is a kind of porous asphalt pavement with high porosity. The developed interconnected pores inside it can infiltrate rainwater into the pavement in time and discharge it laterally, reducing the thickness of the water film on the road surface and avoiding water drifting of driving vehicles. Generate water mist, which greatly improves the safety and comfort of driving in rainy days. However, on the one hand, the drainage asphalt pavement has the core difficulty of the contradiction between the bearing capacity and the drainage capacity. At the same time, the problem of high cost must be considered. It is necessary to save costs as much as possible while satisfying various functions. In the design process, it is necessary to comprehen...

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Problems solved by technology

[0003] In view of the above problems, the present invention proposes an optimal design method of drainage asphalt mixture based on composition mechanism, which solves the problem that the current design of drainage asphalt mixture is mostly dependent on experience, and the traditional mixing ratio design method has low efficiency, large test consumables, and lack of pertinence. To solve the strong problem, each design link corresponds to each key performance, and the mix ratio can be optimized and adjusted in a targeted manner. While ensuring the design quality of drainage asphalt mixture, it can save test time and consumables

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