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Method and system for testing skid resistance of asphalt mixture based on digital image technology

A technology of asphalt mixture and anti-skid performance, which is applied in image enhancement, image analysis, image data processing, etc., and can solve problems such as small-scale detection limitations, expensive equipment, and different principles

Pending Publication Date: 2020-01-31
BEIJING UNIVERSITY OF CIVIL ENGINEERING AND ARCHITECTURE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pavement friction coefficient tester method has basically realized the automation of road surface skid resistance detection, but it needs to be improved in aspects such as temperature, speed and tire use status; the SCRIM lateral force coefficient tester method is suitable for large-area daily detection, However, for small-scale detection, the limitations are large, and the equipment is expensive
[0010] At present, there are various methods for testing the anti-skid performance of asphalt pavement, and various test equipments are used. Different test methods are suitable for different test scenarios, and the evaluation standards of test results are not uniform, even in principle. serious disagreement

Method used

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  • Method and system for testing skid resistance of asphalt mixture based on digital image technology
  • Method and system for testing skid resistance of asphalt mixture based on digital image technology
  • Method and system for testing skid resistance of asphalt mixture based on digital image technology

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Experimental program
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Effect test

Embodiment 1

[0046] Such as figure 1 As shown, a method for testing the skid resistance of asphalt mixture based on digital image technology includes steps:

[0047] S1, prepare the asphalt mixture test piece;

[0048] S2. Laser scanning the test piece to obtain scanning data;

[0049] S3. Obtaining the evaluation index of the test piece structure;

[0050] S4. Evaluate the anti-skid performance according to the structure evaluation index.

[0051] In step S1, the aggregate of the asphalt mixture specimen is selected from basalt, and the asphalt is selected from SBS modified asphalt, the type is AC type, and there are 3 groups of gradations in total.

[0052]In step S2, the scanning parameters of the laser scanning device are first set, and the scanning parameters include at least one of scanning frequency, scanning mode, scanning point spacing, and scanning line width. Then laser scanning is performed on the test piece to obtain laser scanning point cloud data.

[0053] In step S3, c...

Embodiment 2

[0060] When making the asphalt mixture specimen shown, the aggregate of the specimen is basalt, the asphalt is SBS modified asphalt, and the type of the specimen is AC type, with a total of 3 groups of grades. Preparation, the size of the test piece is 300mm×300mm×50mm, the surface of the test piece is as figure 2 shown.

[0061] The laser scanning equipment adopts the laser scanning system HP-L-20.8 of Hexagon Metrology. The working parameters of the system are shown in Table 1:

[0062] Table 1 Working parameters of HP-L-20.8 3D laser scanning system

[0063]

[0064] When scanning the specimen in this embodiment, the scanning frequency is set to 150,000 points / second, the scanning mode is set to orderly scanning, the point spacing of the orderly scanning is 0.5 mm, and the scanning line width is 50 mm. Such as image 3 Shown is the point cloud data obtained by using the laser scanning device to scan the median graded mixture sample according to the set parameters.

...

Embodiment 3

[0075] When evaluating the anti-skid performance of asphalt mixture according to the structural evaluation index, multiple indexes can be evaluated comprehensively, or a single index can be selected for evaluation. When multiple indicators are evaluated, corresponding weights can be set for the selected indicators.

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Abstract

The invention provides a method and a system for testing skid resistance of an asphalt mixture based on a digital image technology. The method comprises the following steps: preparing an asphalt mixture test piece; scanning the test piece by laser to obtain scanning data; acquiring a test piece structure evaluation index; and evaluating the skid resistance according to the structure evaluation indexes. According to the method, the three-dimensional coordinates of the asphalt mixture are obtained through laser scanning, the structure evaluation indexes of the asphalt mixture are calculated, andthe proper structure evaluation indexes are optimized and determined to evaluate the skid resistance of the asphalt mixture. The test method has low sensitivity to the environment; accurate data canbe obtained under various complex conditions, guiding significance is achieved for describing the local pavement microstructure to study the pavement skid resistance, operation is easy, energy consumption is low, the speed is high, a large amount of digital information can be stored in a short time, and study on the surface morphology of the bituminous mixture is visual and high in accuracy.

Description

technical field [0001] The invention relates to the technical field of construction, in particular to a method and system for testing the skid resistance of asphalt mixtures based on digital image technology. Background technique [0002] The anti-skid performance of the pavement paved with asphalt mixture is an important factor affecting road safety. Insufficient anti-skid performance of the road surface will cause serious traffic accidents. Therefore, the anti-skid performance of the asphalt mixture surface is tested to ensure the anti-skid performance of the road surface. It is important to meet the requirements. [0003] At present, the anti-skid performance of asphalt mixture surface is tested mainly including macroscopic structure depth method, pendulum friction meter method, braking distance method, locked wheel trailer method, slip rate method, lateral force coefficient tester method, etc. [0004] Macroscopic structure depth method: Currently, the commonly used met...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06T17/00
CPCG06T7/0004G06T17/00G06T2207/10028G06T2207/30132
Inventor 季节杨跃琴蒋天昊侯芸张艳红
Owner BEIJING UNIVERSITY OF CIVIL ENGINEERING AND ARCHITECTURE
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