Short-term aging simulation method of asphalt components based on thermal analysis-infrared
A technology of short-term aging and simulation method, which is applied in the direction of analyzing materials, weighing by removing certain components, and analyzing materials by optical means.
Active Publication Date: 2021-01-05
NANJING FORESTRY UNIV
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[0010] The purpose of the present invention is to provide a method for simulating the short-term aging of each component of road asphalt. The method uses thermal analysis-infrared spectrum combined technology to conduct real-time analysis of the thermal weight loss process of the four components of asphalt and their volatile components. Detection, to solve the problem that asphalt with complex components is regarded as a uniform and single whole, and it is difficult to reveal the short-term aging mechanism of asphalt at the component level by using conventional macro-short-term aging tests. It provides a new method and technology for the study of asphalt aging
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[0017] The present invention provides a short-term aging simulation method for various components of asphalt based on thermal analysis-infrared combination, and the specific implementation steps are as follows:
[0018] (1) Select the asphalt sample, prepare the four components of asphalt by solvent precipitation and chromatographic column method, that is, saturate, aromatic, colloid and asphaltene, calculate the content of each component in the asphalt, and according to the current "high Performance Specifications for Design of Asphalt Mixtures determines that the short-term aging simulation test temperature of each component is 135°C and the time is 4 hours;
[0019] (2) Adjust the thermogravimetric (TG) / differential scanning calorimeter (DSC) thermal analysis system, set the temperature baseline, raise the temperature to 135°C at a rate of 40°C / min, and maintain the temperature for 4 hours, during which the temperature is increased at 60ml / min The flow of air is continuousl...
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The invention discloses a short-term ageing simulation method for various asphalt components based on a thermal analysis-infrared combination technology and belongs to the technical field of road asphalt pavement durability. The problems that asphalt with complex components is regarded as a uniform and single whole and the short-term ageing mechanism of the asphalt is difficultly disclosed by stretching into the component level in the conventional macroscopic short-term ageing test at present are solved. The method comprises the following steps: sequentially preparing four components such as asphaltene, saturated fragrance, aromatics and colloid by adopting solvent precipitation and column chromatography methods; adding four component samples into a thermal analyzer crucible, regulating the program of the thermal analysis instrument, maintaining the samples at a constant temperature of 135 DEG C, and continuously introducing air; and detecting and recognizing gas volatiles in the process of ageing the four components. According to the combination technology, the mass change conditions and thermal effect changes of the four components in the thermal decomposition process can be quantitatively judged, the gas volatile components in the ageing process can be traced and checked in real time, and in-depth study of the short-term ageing characteristics of the various asphalt components and the short-term asphalt ageing mechanism is realized.
Description
technical field [0001] The invention relates to a short-term aging simulation method for various components of road asphalt based on thermal analysis-infrared combined technology, and belongs to the technical field of asphalt aging. Background technique [0002] Before the asphalt pavement is opened to traffic, the mixture needs to be hot-mixed and paved. The high temperature causes the asphalt binder in the asphalt pavement to undergo a certain degree of short-term aging. The short-term aging of asphalt is due to the physical and chemical effects of volatilization, oxidation, decomposition, and polymerization of light components of asphalt in a high-temperature and aerobic environment, which lead to changes in the internal molecular structure and chemical components of asphalt, which in turn promotes the physical and chemical properties of asphalt. process of deterioration. After the asphalt ages, the stiffness increases and the viscosity decreases, resulting in poor low-t...
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IPC IPC(8): G01N5/04G01N25/20G01N21/3504
CPCG01N5/04G01N21/3504G01N25/20G01N2021/3595
Inventor 许涛胡智慧盛晓慧王沫
Owner NANJING FORESTRY UNIV