Asphalt aging performance prediction method based on isothermal thermal analysis kinetics

Abstract

The invention discloses an asphalt aging performance prediction method based on isothermal thermal analysis kinetics, belongs to the technical field of road asphalt pavement durability, and solves problems that an asphalt aging process cannot be predicted accurately and more practical asphalt aging performance prediction cannot be provided for pavement management and maintenance work when attenuation of a macroscopic performance index of the asphalt is adopted to speculate a pavement performance degradation degree at present. The asphalt aging performance prediction method provided by the invention comprises the following steps: firstly, selecting an asphalt sample, testing with a thermal analyzer, simulating thermal-oxidative aging of the asphalt to obtain TG and DTG data and a char yieldof the asphalt; secondly, selecting a reaction mechanism function corresponding to the asphalt aging process according to a chemical structure, a functional group and thermal stability change of theasphalt aging process to establish an isothermal thermal analysis kinetics model of the asphalt; finally, using an aging-time equivalence principle to analyze equivalence of the asphalt aging processand time, calculating an isothermal aging shift factor by an Arrhenius equation to predict the asphalt aging performance, thereby providing a basis for decision-making of an 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...