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Rapid assessment method for RAP content in recycled asphalt mixture based on infrared spectrum

A technology of recycled asphalt and infrared spectroscopy, which is applied in the direction of material analysis, measurement device, and material analysis by optical means, which can solve the problems of inability to realize on-site quality monitoring of recycled materials, and inability to evaluate and detect RAP content. Fast evaluation, small standard deviation effect

Inactive Publication Date: 2019-12-24
甘肃省交通规划勘察设计院股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To sum up, the existing research technology is still unable to quickly evaluate and detect the content of RAP in recycled asphalt mixture on the construction site, and cannot realize the quality monitoring of on-site recycled materials. Since the introduction of infrared spectroscopy into the application research of road construction materials Achieved fruitful results in theoretical analysis and testing methods

Method used

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  • Rapid assessment method for RAP content in recycled asphalt mixture based on infrared spectrum
  • Rapid assessment method for RAP content in recycled asphalt mixture based on infrared spectrum
  • Rapid assessment method for RAP content in recycled asphalt mixture based on infrared spectrum

Examples

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Effect test

Embodiment 1

[0045] Taking SK90# (referred to as SK) as an example of plant-mixed hot recycled asphalt mixture (AC-20) with different RAP content prepared from new asphalt, the specific testing and evaluation steps for RAP content are as follows:

[0046] 1. Select SK as the new asphalt, prepare factory-mixed hot recycled asphalt mixtures with different RAP content in the laboratory according to the "Technical Specifications for Recycling of Highway Asphalt Pavement" (JTG F41-2008), and knead the recycled asphalt mixture after mixing , so that the recycled materials with different particle sizes are completely separated, and then the standard square hole sieve is used to screen the kneaded mixture, and the optimal particle size is selected for the preparation of the suspension sample of the recycled asphalt mixture. .

[0047] 2. Put the regenerated asphalt mixture with the required particle size in the volumetric flask, then add the corresponding proportion of trichlorethylene organic sol...

Embodiment 2

[0057] Taking Zhenhai 90# (referred to as ZH) as an example of factory-mixed hot recycled asphalt mixture (AC-20) with different RAP content prepared as new asphalt, the specific testing and evaluation steps for RAP content are as follows:

[0058] 1. Select ZH as the new asphalt, and prepare factory-mixed hot recycled asphalt mixtures with different RAP content in the laboratory according to the "Technical Specifications for Recycling of Highway Asphalt Pavement" (JTG F41-2008), and knead the recycled asphalt mixture after mixing , so that the recycled materials with different particle sizes are completely separated, and then the standard square hole sieve is used to screen the kneaded mixture, and the optimal particle size is selected for the preparation of the suspension sample of the recycled asphalt mixture. .

[0059] 2. Put the regenerated asphalt mixture with the required particle size in the volumetric flask, then add the corresponding proportion of trichlorethylene o...

Embodiment 3

[0069] Taking Kelian 90# (referred to as KL) as an example of factory-mixed hot recycled asphalt mixture (AC-20) with different RAP content prepared by new asphalt, the specific testing and evaluation steps for RAP content are as follows:

[0070] 1. Select KL as the new asphalt, prepare factory-mixed hot recycled asphalt mixtures with different RAP content in the laboratory according to the "Technical Specifications for Recycling Highway Asphalt Pavement" (JTG F41-2008), and knead the recycled asphalt mixture after mixing , so that the recycled materials with different particle sizes are completely separated, and then the standard square hole sieve is used to screen the kneaded mixture, and the optimal particle size is selected for the preparation of the suspension sample of the recycled asphalt mixture. .

[0071] 2. Put the regenerated asphalt mixture with the required particle size in the volumetric flask, then add the corresponding proportion of trichlorethylene organic s...

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Abstract

The invention relates to a rapid assessment method for RAP content in a recycled asphalt mixture based on an infrared spectrum, and the method comprises the following steps of (1) preparing a recycledasphalt mixture suspension for infrared spectrum test; (2) using a transfer pipette to take 2-3 drops of the recycled asphalt mixture suspension to be dropped on the surface of the diamond crystal, collecting infrared spectrum spectra of samples of plant-mixed hot-recycled asphalt mixture suspensions with different RAP contents by adopting a Fourier transform infrared spectrometer after being left for 1 to 2 minutes, and establishing an evaluation model between the RAP contents and evaluation indexes by using ICO, ISO and ICO+ISO as evaluation indexes; (3) performing infrared spectral data collection on the plant-mixed hot-recycled asphalt mixture suspension with unknown RAP content to calculate an estimated value of the RAP content in the recycled asphalt mixture; and (4) comparing the estimated value of the RAP content measured on site with the actual value of the RAP content of the recycled asphalt mixture required in the construction plan. The rapid assessment method provided by the invention has the advantages of simple operation, accurate and reliable results, and can realize the quality control detection of on-site recycled materials.

Description

technical field [0001] The invention relates to the research field of quality control detection technology of recycled asphalt mixture, in particular to a rapid evaluation method for RAP content in recycled asphalt mixture based on infrared spectroscopy. Background technique [0002] Fourier Transform Infrared Spectroscopy (FTIR) is a kind of molecular spectroscopy. Its principle is to irradiate the test sample with infrared light of different frequencies. When the frequency of infrared light is the same as the vibration frequency of the chemical bonds in the molecule, the molecules in the sample will absorb Infrared light, different functional groups in molecules can be analyzed by measuring the absorbed infrared light. Infrared spectroscopy has the advantages of high sensitivity and good repeatability, and provides a reliable means of chemical structure research for sample testing and analysis. Attenuated total reflection accessory (ATR) of Fourier transform infrared spec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3577G01N1/28G01N1/38
CPCG01N21/3577G01N1/28G01N1/38G01N2021/3595G01N2201/129
Inventor 李晓民李志伟豆莹莹
Owner 甘肃省交通规划勘察设计院股份有限公司