Prediction method of asphalt aging performance based on isothermal thermal analysis kinetics

Abstract

The invention is an asphalt aging performance prediction method based on isothermal thermal analysis kinetics, which belongs to the technical field of road asphalt pavement durability, and solves the problem of inability to accurately predict the aging process of asphalt by estimating the degradation degree of asphalt road performance by attenuation of a certain macroscopic performance index of asphalt. 1. It is difficult to provide more practical prediction of asphalt aging performance for pavement management and maintenance work. The present invention first selects asphalt samples, uses a thermal analyzer to test, simulates asphalt thermo-oxidative aging, and obtains asphalt TG, DTG data and char formation rate; secondly, according to the chemical structure, functional group and thermal stability changes of the asphalt aging process, it is preferred to compare with asphalt Based on the reaction mechanism function corresponding to the aging process, an asphalt isothermal analysis kinetic model is established; finally, the aging-time equivalence principle is used to analyze the asphalt aging process and time equivalence, and the constant temperature aging is calculated by the Arrhenius equation The displacement factor predicts the aging performance of asphalt and provides a basis for decision-making of asphalt pavement maintenance scheme.

Description

technical field [0001] The invention relates to an asphalt aging performance prediction method based on isothermal thermal analysis kinetics, and belongs to the technical field of asphalt thermal performance. Background technique [0002] With the development of our country's economy, the traffic demand is increasing, and the highway traffic industry in our country is developing rapidly. As one of the main forms of pavement, asphalt pavement has drawn the attention of road workers to its durability. The aging of asphalt will make the asphalt hard and brittle and reduce its flexibility, which will affect the adhesion and low temperature ductility of asphalt mixture. In terms of road performance, it is prone to cracks. The aging performance of asphalt greatly affects the service life of the road. Using a certain method to predict the aging degree of asphalt pavement is conducive to better decision-making and formulation of maintenance programs for asphalt pavement, so that t...

AI Technical Summary

Problems solved by technology

[0011] In view of the current use of the attenuation of a certain macroscopic performance index of asphalt to infer the deterioration degree of asphalt pavement performance, it is impossible to accurately predict the aging process of asphalt, and it is difficult to provide more practical prediction of asphalt aging performance for pavement management and maintenance work