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A method of identifying bitumen brands by combining infrared spectroscopy with high-temperature simulated distillation technology

A high-temperature simulated distillation and infrared spectroscopy technology, applied in the field of road engineering applications, can solve problems such as expensive equipment, road surface diseases, and long time consumption, and achieve the effects of reliable data, high accuracy, and simple operation

Active Publication Date: 2016-07-06
GANSU CHANGLONG HIGHWAY MAINTENANCE TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these test methods have many limitations, and there are still some problems as follows: (1) Although the three indicators are easy to operate, the asphalt needs to be melted in advance, and the time from molding, curing to testing is as long as 4~5 hours, which is time-consuming; (2) There are many tests that are empirical, that is, field experience is needed before meaningful information can be obtained from the test. One such example is the penetration test, which reflects the consistency of the bitumen, but any bitumen penetration The relationship between the same performance must be obtained through experience; (3) indicators such as penetration, viscosity, and softening point can only reflect the situation under specific temperature and specific load conditions, and it is difficult to reflect the performance differences of asphalt under other conditions , it is possible to classify different asphalts into the same grade, but in fact, these asphalts may have completely different performance characteristics under different temperature conditions, and may not be suitable for paving roads or local climate, resulting in road surface diseases
However, the SHRP detection index is time-consuming and labor-intensive, and the equipment is expensive, which cannot judge the quality of asphalt in a timely and effective manner.

Method used

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  • A method of identifying bitumen brands by combining infrared spectroscopy with high-temperature simulated distillation technology
  • A method of identifying bitumen brands by combining infrared spectroscopy with high-temperature simulated distillation technology
  • A method of identifying bitumen brands by combining infrared spectroscopy with high-temperature simulated distillation technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Taking Kelian-90# asphalt as an example, the specific test steps are as follows:

[0074] 1. Install the ATR accessory on the spectrometer, and set the spectral scanning range to 650~4000cm -1 , the number of scans is 32 times, and the scan interval is 2cm -1 . Collect the background spectrum first, then collect the Kelian-90# asphalt spectrum, see figure 1 a.

[0075] 2. Weigh 0.0396g of Kelian-90# asphalt, add 2.0002gCS 2 dissolve. Run the method, test asphalt. Obtaining a Gas Chromatogram of Bitumen figure 2 a.

[0076] 3. Call the high-temperature simulated distillation software, subtract the baseline, and establish a correction table of retention time to boiling point; call the reference oil test data to determine the response factor of the instrument; analyze the chromatographic data of Kelian-90# asphalt to obtain the initial distillation of the asphalt Point and boiling point distribution curves, see Table 1.

[0077] Table 1 Kelian-90# asphalt boiling...

Embodiment 2

[0080] Taking SK-90# asphalt as an example, the steps are as follows:

[0081] 1. Install the ATR accessory on the spectrometer, and set the spectral scanning range to 650~4000cm -1 , the number of scans is 32 times, and the scan interval is 2cm -1 . Collect the background spectrum first, then collect the SK-90# asphalt spectrum, see figure 1 b.

[0082] 2. Weigh SK-90# asphalt 0.040g plus 2.0125gCS 2 dissolve. Run the method, test asphalt. Obtaining a Gas Chromatogram of Bitumen figure 2 b.

[0083] 3. Call the high-temperature simulated distillation software, subtract the baseline, and establish a correction table of retention time to boiling point; call the reference oil test data to determine the response factor of the instrument; analyze the chromatographic data of SK-90# asphalt to obtain the initial boiling point of the asphalt And boiling point distribution curve, see Table 2.

[0084] Table 2 SK90-# asphalt boiling range cutting interval results

[0085] ...

Embodiment 3

[0087] Taking West Petrochemical-90# asphalt as an example, the specific test steps are as follows:

[0088] 1. Install the ATR accessory on the spectrometer, and set the spectral scanning range to 650~4000cm -1 , the number of scans is 32 times, and the scan interval is 2cm -1 . Collect the background spectrum first, and then collect the Kexi Petrochemical-90# asphalt spectrum, see figure 1 c.

[0089] 2. Weigh West Petrochemical-90# asphalt 0.0403, add 2.012gCS 2 dissolve. Run the method, test asphalt. To obtain a gas chromatogram of bitumen, see figure 2 c.

[0090] 3. Call the high-temperature simulated distillation software, deduct the baseline, and establish a correction table of retention time to boiling point; call the reference oil test data to determine the response factor of the instrument; analyze the color chromatography data of West Petrochemical-90# asphalt, and obtain the initial distillation of the asphalt Point and boiling point distribution curves, se...

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Abstract

The invention relates to a method for identifying asphalt brands using infrared spectroscopy combined with high-temperature simulated distillation technology. The method comprises the following steps: (1) using an ATR attachment to obtain the infrared spectra of each brand of asphalt collected in the market; The infrared spectrograms of brand asphalt were smoothed according to conventional methods to determine the characteristic absorption peaks of standard asphalt; (3) Gas chromatograms of various brands of asphalt commercially available were collected with a gas chromatograph; (4) Commercially available brands of asphalt were processed with high-temperature simulated distillation software The data in the gas chromatogram of the standard sample; (5) carry out the infrared spectrum test on the unknown asphalt, and obtain the characteristic absorption peak of the unknown asphalt; (6) conduct the gas chromatography test on the unknown asphalt, and obtain the gas chromatogram of the unknown asphalt; The data in the figure is processed to obtain the boiling range of the unknown asphalt; (8) compare the unknown asphalt with the standard asphalt, and finally determine the brand of the unknown asphalt. The invention has short testing time and accurate results.

Description

technical field [0001] The invention relates to the field of road engineering applications, in particular to a method for identifying asphalt brands by combining infrared spectroscopy with high-temperature simulated distillation technology. Background technique [0002] With the rapid development of my country's national economy, the mileage of highway construction is rapidly increasing. As of 2010, my country's expressways exceeded 75,000 kilometers. In the national "Twelfth Five-Year Plan", the total mileage of highways will reach 5.5 to 6 million kilometers. Asphalt pavement is widely used all over the world due to its advantages of low noise, good flatness, and easy maintenance. More than 90% of the roads use asphalt pavement. Asphalt is the cementing material in road materials, and its quality directly affects the road surface. Therefore, the evaluation of asphalt quality has been the focus of research in various countries for many years. The survey shows that there a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/3577G01N30/02
Inventor 李晓民赵璠新赵静卓张国宏魏定邦李刊丁民郭怀存杨小森冯中良张兴军陈天峰李丽
Owner GANSU CHANGLONG HIGHWAY MAINTENANCE TECH RES INST CO LTD