Modifying method for improving shape memory property of asphalt

A kind of asphalt and memory technology, applied in the field of asphalt pavement materials, can solve the problems of poor shape memory performance of asphalt, slow self-repair rate, long load interval, etc., to achieve the effect of prolonging service life, reducing normal traffic interference, and saving operating costs

Inactive Publication Date: 2017-11-17
NANJING FORESTRY UNIV
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AI Technical Summary

Problems solved by technology

[0011] In order to solve the current problems of poor shape memory performance of asphalt, long load intervals required for self-repair, slow self-repair rate, low efficiency, poor effect, and only one-time repair of micro-cracks, etc.

Method used

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Embodiment Construction

[0014] The invention provides a modification method for improving the shape memory performance of asphalt, and the specific implementation steps are as follows:

[0015] (1) Prefer the shape memory polymer whose phase transition temperature matches the temperature field of the asphalt pavement, heat the asphalt to 150°C, add a certain amount of shape memory polymer modifier to the asphalt, and stir continuously with a glass rod for 20 minutes, so that Mix basically evenly;

[0016] (2) Use an asphalt high-speed shearing machine to cut for 1 hour at a speed of 5000 rpm, then stir with a glass rod to remove the air bubbles in the modified asphalt, and place it in an oven at 150 ° C for 30 minutes to obtain a shape memory polymer. Physically modified asphalt;

[0017] (3) Using differential scanning calorimeter, Fourier transform infrared spectrometer, scanning electron microscope, energy dispersive spectrometer, and transmission electron microscope to analyze the phase transiti...

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Abstract

The invention relates to a modifying method for improving the shape memory property of asphalt and belongs to the technical field of asphalt pavement materials. By adoption of the modifying method, the problems that the shape memory property is poor, the self repairing needs long load interval, low in rate, low in efficiency and poor in effect, and the microcracks only can be repaired once in the existing asphalt are solved, and the durability of the asphalt pavement is improved. The modifying method comprises the following steps: firstly preferring shape memory polymers with matching of revertible-phase phase transformation temperature and pavement temperature field, and adopting a high-speed shearing machine to prepare modified asphalt with the shape memory property; then analyzing the influence of the shape memory polymers on the properties of the asphalt components by utilizing an X-ray diffraction and transmission electron microscope and a dynamic shearing rheometer and the like; and finally testing the shape memory property of the asphalt doped with the shape memory polymers, and by comprehensive consideration of all test results, determining the types of the shape memory polymers and the optimum dosage thereof so as to further improve the shape memory property and the self-repairing efficiency of the asphalt, improve the self-repairing capability of the asphalt pavement and prolong the service life of the pavement pavement.

Description

technical field [0001] The invention relates to a modification method for improving asphalt shape memory performance for self-repairing asphalt, and belongs to the technical field of asphalt pavement materials. Background technique [0002] In recent years, China's highways have developed rapidly, and asphalt mixture pavement has become the mainstream of road pavement due to its advantages such as smooth surface, low vibration, low noise, wear resistance, short construction period, easy maintenance and recyclability. First of all, because the asphalt pavement has been exposed to the natural environment and the driving load in the early stage of use, it is prone to damage, and fatigue cracking is one of the early damage forms of the asphalt pavement. Coupled with the repeated effects of traffic loads and the environment, the microcracks in the asphalt continue to expand and develop, become denser, and penetrate through the Unicom to form macrocracks, which eventually lead to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08L101/00G01N11/00
CPCG01N11/00C08L95/00C08L101/00
Inventor 许涛王沫盛晓慧胡智慧
Owner NANJING FORESTRY UNIV
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