Testing system for scattering peeling resistance of large-aperture water discharging asphalt pavement and method thereof

Abstract

The invention relates to a testing system for scattering peeling resistance of a large-aperture water discharging asphalt pavement and a method thereof, wherein the system and the method belong to thefield of road engineering technology in traffic transportation engineering. The testing system comprises a loading wheel, a unidirectional ratchet mechanism, a first stepping motor, a rigid frame, alaser scanning sensor, a bearing platform base, a rigid connecting rod, a scattered particle sucking device, a second stepping motor, a hydraulic servo loading device, a control analysis device, a base, etc. The testing system and the method can accurately simulate damage forms of surface particle scattering and peeling of the large-aperture water discharging pavement caused by an automobile loadin an operation period, thereby supplying acceleration loading testing data infected by factors such as approximate traffic load for proportion ratio of the water discharge asphalt pavement. Furthermore an accurate quantitative index and an evaluation testing method are presented for aiming at the scattering peeling resistance of the water discharging asphalt mixture, thereby ensuring high durability of the water discharging asphalt pavement projects.

Description

technical field [0001] The invention belongs to the technical field of highway engineering in traffic and transportation engineering, and in particular relates to a test system and method for anti-flying and spalling performance of large-gap drainage asphalt pavement. Background technique [0002] According to the survey statistics, the accident rate of vehicles driving on the expressway in rainy days is 5 to 7 times that in sunny days. In order to solve the safety problem of road driving in rainy weather, promoting drainage asphalt pavement surface pavement on expressways is one of the most effective measures at present. . Drainage asphalt pavement drains water on the road surface through the internal large void structure, ensuring driving safety in rainy days; but the large void ratio (usually 18%-20%, which is 4-5 times that of conventional pavement) makes the strength of drainage asphalt mixture It is maintained only by the cohesive force between the interface of the mi...

AI Technical Summary

Problems solved by technology

The test has a limited degree of simulation of temperature, wheel braking or shearing, and Marshall specimens with different gradation designs need to be tested separately, which takes a long time; Reliably evaluate and predict anti-splash performance of drained asphalt pavements within a short test period

[0005] The existing technical scheme adopts the Fort Kentucky test method, and from the test conditions, there is no good simulation of the environmental temperature change, water immersion, vehicle braking, turning and other factors during the operation of the actual drainage asphalt pavement; secondly, the weight of the test piece is used Impacting the inner wall of the steel cylinder to cause the spalling of aggregate particles is very different from the mechanism of flying disease, which often leads to fragmentation of the specimen instead of damage in the form of spalling due to the strength of the aggregate; third, the Kenta Fort test can only be completed each time A type of Marshall test piece, for performance evaluation, often requires data analysis of multiple sets of test pieces

If the current conventional test method is used to carry out the Kenta Fort test of different gradation types of materials, the collision between different test pieces will cause the final evaluation result to be distorted, and it will take a long time, resulting in high dispersion of data

To sum up, the existing test methods cannot satisfy the accurate evaluation of anti-scatter performance in the design of large-gap drainage asphalt pavement. Evaluation method

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