Asphalt aging performance prediction method based on isothermal thermal analysis kinetics

A technology of aging performance and prediction method, which is applied in the field of asphalt thermal performance, can solve the problems of asphalt pavement performance degradation, difficulty in providing road surface management and maintenance work, and inability to accurately predict asphalt aging process, so as to prolong the service life and achieve sustainable development Effect

Active Publication Date: 2018-01-12
NANJING FORESTRY UNIV
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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

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Embodiment Construction

[0015] The present invention provides an asphalt aging performance prediction method based on isothermal thermal analysis kinetics, and the specific implementation steps are as follows:

[0016] (1) Select the asphalt sample, according to the relevant regulations on the short-term aging test of asphalt mixture in the current "Code for Design of High Performance Asphalt Mixture", determine the temperature of the asphalt thermo-oxidative aging simulation test as 135°C, and keep the constant temperature for 4 hours;

[0017] (2) Adjust the thermogravimetric (TG) analyzer, 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 air is continuously ventilated at a flow rate of 60ml / min, and the alumina crucible is placed On the thermal analysis stand, follow this procedure to test the temperature program of the thermal analyzer;

[0018] (3) Take 10 mg of asphalt sample, put it into an alumina cr...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/00
Inventor 许涛胡智慧盛晓慧王沫
Owner NANJING FORESTRY UNIV
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