Combustion dynamic parameter-based asphalt component thermal stability evaluation method

Abstract

The invention relates to a novel method for evaluating asphalt four-component combustion dynamics based on a plurality of heating rates, belongs to the technical field of asphalt materials, and solvesthe problems that the temperature rise rate variability is difficult to simulate in actual fire disaster on the basis of a single heating rate, the reliability in calculation of the combustion dynamics parameters is poor, the thermal stability of all the components of the asphalt is difficult to objectively evaluate, and the asphalt combustion dynamics characteristic cannot be deeply evaluated. The method comprises the following steps of firstly, separating four components from asphalt, and carrying out industrial and element analysis respectively; carrying out thermo-gravimetric analysis inthe air, raising the temperature to 800 DEG C from the room temperature at three temperature rising rates, and obtaining a TG-DTG curve; dividing different combustion stages, and calculating dynamic parameters of different combustion stages by adopting a differential method and an integral method, and carrying out mutual checking; and finally, observing the microscopic morphology of the surface ofthe combustion residue, testing element components and contents, comparing the dynamic parameters of different combustion stages of the asphalt components, evaluating the four-component thermal stability of the asphalt, and disclosing the asphalt combustion characteristic from the component level.

Description

technical field [0001] The invention relates to a four-component asphalt thermal stability evaluation method based on combustion kinetic parameters at multiple heating rates, and belongs to the technical field of asphalt materials. Background technique [0002] Thermal analysis is a technique for measuring the relationship between the physical properties of a substance and the temperature at a programmed temperature. It is mainly used to study physical changes of materials, such as crystal transformation, melting, sublimation, etc., and chemical changes, such as dehydration, decomposition, redox, etc. Thermal analysis provides not only thermodynamic parameters, but also combustion kinetic parameters. Therefore, thermal analysis is of great significance in material research and selection, as well as theoretical research in thermodynamics and kinetics. [0003] Thermal analysis refers to the method of analyzing the relationship between thermodynamic parameters or physical pa...

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Problems solved by technology

[0012] In view of the fact that the current asphalt four-component thermal stability evaluation method is based on a single heating rate, it is difficult to simulate the variability of the heating rate during an actual fire, the reliability of the calculated combustion kinetic parameters of each component of asphalt is poor, and it is difficult to objectively evaluate the thermal stability of each component of asphalt. The inability to deeply evaluate the combustion dynamics of asphalt from the component level