Method for identifying asphalt brands through infrared spectrum combined with high-temperature simulation and distillation technology

Abstract

The invention relates to a method for identifying asphalt brands through an infrared spectrum combined with a high-temperature simulation and distillation technology. The method comprises the following steps: (1) using an ATR (attenuated total reflectance) accessory for respectively obtaining infrared spectrum charts of collected asphalt of each brand sold in a market; (2) respectively performing smooth processing on the infrared spectrum charts of the collected asphalt of each brand sold in the market according to a conventional method, and determining the characteristic absorption peaks of prototype asphalt; (3) using a gas chromatograph for collecting the gas chromatogram of the asphalt of each brand sold in the market; (4) using high-temperature simulation and distillation software for processing data in the gas chromatogram of the asphalt prototype of each sale sold in the market; (5) performing an infrared spectrum test on unknown asphalt, and obtaining the characteristic absorption peak of the unknown asphalt; (6) performing a gas chromatography test on the unknown asphalt, and obtaining the gas chromatogram of the unknown asphalt; (7) processing the data in the gas chromatogram of the unknown asphalt, and obtaining the boiling range of the unknown asphalt; (8) respectively comparing the unknown asphalt with the prototype asphalt, and finally determining the brand of the unknown asphalt. The method disclosed by the invention has the advantages of short test 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...

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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.

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