Short-term ageing simulation method for various asphalt components based on thermal analysis-infrared combination
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, and can solve the problems that it is difficult to reveal the short-term aging mechanism of asphalt at the component level.
Active Publication Date: 2017-12-01
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 each component of asphalt based on thermal analysis-infrared combined use. The specific implementation steps are as follows:
[0018] (1) Select the asphalt sample, use solvent precipitation and column method to prepare the four components of asphalt, namely saturated component, aromatic component, pectin and asphaltene, calculate the content of each component in the asphalt, and according to the current "High "Performance Asphalt Mix Design Specification" determines that the short-term aging simulation test temperature of each component is 135℃ and the time is 4 hours;
[0019] (2) Adjust the thermal analysis system of thermal weight loss (TG) / differential scanning calorimeter (DSC), set the temperature baseline, heat up to 135°C at a rate of 40°C / min, and maintain the temperature for 4 hours, during which the temperature is 60ml / min Continue to ventilate the air at the flow rate, place the alumina cruc...
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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 is a short-term aging simulation method for each component of road asphalt based on a 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, paving and other processes. The high temperature causes a certain degree of short-term aging of the asphalt binder in the asphalt pavement. The short-term aging of asphalt is due to the physical and chemical effects of light components volatilization, oxidation, decomposition, polymerization, etc. in the high temperature and aerobic environment, resulting in changes in the internal molecular structure and chemical components of the asphalt, which in turn promotes the physical and chemical properties of the asphalt The process of deterioration. After the asphalt is aged, the stiffness increases and the viscosity decreases, resulting in poor low-tem...
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Login to View More 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