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Asphalt mixture temperature segregation evaluation method based on infrared imaging

An asphalt mixture and evaluation method technology, which is applied in radiation pyrometry, material thermal development, measuring device and other directions, can solve the problems of lack of evaluation of mixture temperature segregation, inability to evaluate asphalt mixture temperature distribution and segregation state and other problems , to achieve comprehensive and accurate temperature segregation conditions, accurate evaluation, and comprehensive effects

Inactive Publication Date: 2017-01-04
TONGJI UNIV
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Problems solved by technology

[0009] my country's current highway asphalt pavement construction technical specification (JTG F40-2004) puts forward the temperature requirements of asphalt mixture, puts forward the temperature requirements of asphalt mixture leaving the factory, arriving on site, paving and rolling, but lacks the temperature requirements after paving. Assessing the temperature segregation status of the mixture, and using the traditional point-type temperature measurement method, it is difficult to measure the temperature extreme point position of the mixture, and it is impossible to evaluate the overall temperature distribution and segregation status of the asphalt mixture

Method used

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  • Asphalt mixture temperature segregation evaluation method based on infrared imaging
  • Asphalt mixture temperature segregation evaluation method based on infrared imaging
  • Asphalt mixture temperature segregation evaluation method based on infrared imaging

Examples

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Embodiment 1

[0047] The pavement of an airport runway is overlaid. The original pavement structure is cement concrete, and asphalt mixture is paved on it. The lower layer of the overlay layer is modified AC-20, and the upper layer is SMA-13. The paving of the construction The temperature requirement is not lower than 160°C, and the initial pressure temperature requirement is not lower than 155°C. The site uses the FLUKE TIX560 infrared thermal imager to measure the site construction temperature, figure 2 Shown are the infrared images taken at some places on the site, and the infrared image pixels are 320×240.

[0048] Using SmartView software to process the grayscale image as image 3shown. The highest temperature in area a is 159.56°C and the lowest temperature is 153.61°C; the highest temperature in area b is 153.64°C and the lowest temperature is 142.63°C; the highest temperature in area c is 147.93°C and the lowest temperature is 141.58°C. The grayscale image is obtained through MA...

Embodiment 2

[0055] The pavement of a highway adopts asphalt concrete structure. The asphalt surface layer is a three-layer structure. The upper layer is 5cm AC-10, the middle layer is 7cm AC-16, and the lower layer is 9cm AC-25. The construction time is summer. According to the requirements of 5.6 in "Technical Specifications for Construction of Highway Asphalt Pavement" (JTG F40-2004), the paving temperature should not be lower than 140°C. Measure the temperature of the pavement with an infrared camera, Figure 4 Shown are the infrared images taken at some places on the site, and the grayscale images are as follows Figure 5 shown.

[0056] The highest temperature in area a is 143.61°C and the lowest temperature is 136.00°C; the highest temperature in area b is 131.23°C and the lowest temperature is 124.84°C; the highest temperature in area c is 130.01°C and the lowest temperature is 120.80°C; the highest temperature in area d is 124.82°C , the lowest temperature is 119.31°C. The gray...

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Abstract

The invention relates to an asphalt mixture temperature segregation evaluation method based on infrared imaging to be used for evaluating the mixture paving temperature segregation degree of an asphalt pavement or airport asphalt road surface. The method comprises the steps of 1, calibrating a thermal infrared imager, shooting an asphalt mixture of a target area, and generating an infrared image; 2, acquiring the temperature value of each pixel point in the infrared image; 3, calculating the temperature segregation index of the asphalt mixture of the target area and establishing a temperature segregation evaluation standard, and evaluating asphalt mixture temperature segregation of the target area according to the temperature segregation evaluation standard. Compared with the prior art, the method has the advantages that infrared imaging is conducted, the method is simple and convenient to implement, various aspects are considered, and evaluation is accurate.

Description

technical field [0001] The invention relates to a method for temperature segregation analysis of asphalt mixture, in particular to an evaluation method for temperature segregation of asphalt mixture based on infrared imaging. Background technique [0002] As a thermoplastic material, asphalt's performance is greatly affected by temperature. It has significant viscous flow deformation characteristics under high temperature conditions, and shows strong deformation resistance at low temperatures. Depending on the dependence of asphalt on temperature, the asphalt mixture needs to be rolled at an appropriate high temperature to obtain a good degree of compaction. When the rolling temperature is low, it is easy to cause insufficient compaction, resulting in a larger porosity of the mixture. Under the action of moisture and load, it is easy to cause early damage to the road surface or pavement, which affects the service life. [0003] At present, in the construction of asphalt roa...

Claims

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Application Information

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IPC IPC(8): G01N25/20G01J5/00
CPCG01N25/20G01J5/00G01J2005/0077
Inventor 凌建明袁捷肖飞鹏陈俊君王嘉宇
Owner TONGJI UNIV
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