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A kind of self-healing asphalt material and its preparation method and application

A kind of asphalt material, self-healing technology, applied in the direction of building insulation materials, building components, buildings, etc., can solve the problems of self-repair, large diameter of metal conductive phase, unfavorable engineering needs, etc., to increase self-healing Combined performance, improvement of road performance, reduction of modification cost

Active Publication Date: 2022-07-19
SHANDONG UNIV
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Problems solved by technology

[0004] At present, the treatment measures for cracks and other diseases on the old road surface mainly include crack sealing method, repair agent spraying method and other methods, but these maintenance and repair methods are not only cumbersome but also costly, which is not conducive to the needs of actual projects
Although in the past, researchers proposed the concept of self-healing asphalt by combining the doping of metal conductive phase and the form of electromagnetic heating, but due to the large diameter of the metal conductive phase, the local heating temperature will be too high in the actual application process, resulting in asphalt aging. Insufficient heating of the remaining parts cannot achieve the ideal self-healing purpose

Method used

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  • A kind of self-healing asphalt material and its preparation method and application
  • A kind of self-healing asphalt material and its preparation method and application

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preparation example Construction

[0038] In one embodiment of the present invention, a method for preparing the above self-healing asphalt material is provided, and the preparation method includes the following steps:

[0039] (a 1 ) adding carbon nanotubes and graphene into the molten pitch, stirring manually, until carbon nanotubes and graphene completely enter the matrix;

[0040] (a 2 ) adopts the method of high-speed shearing to disperse carbon nanotubes and graphene, so that carbon nanotubes and graphene are fully dispersed in the pitch;

[0041] (a 3 ) adding molten rubber to the mixture obtained in step (2), stirring mechanically, and heating at constant temperature during the mixing process, that is, the self-healing asphalt material is prepared.

[0042] Alternatively, the preparation method comprises the following steps:

[0043] (b 1) disperse carbon nanotubes and graphene in molten rubber, and obtain carbon nanotube / graphene / rubber composite material by extruding;

[0044] (b 2 ) adopts the...

Embodiment 1

[0054] (1) take 1g CNT and 1g graphene and add in 190g molten matrix pitch, carry out manual stirring with glass rod, until carbon nanotube completely enters pitch matrix;

[0055] (2) further adopt the method of high-speed shearing to disperse CNT and graphene, and carry out high-speed shearing for 50 minutes at a speed of 5000rpm;

[0056] (3) Finally, 8 g of molten rubber powder was added to the mixture, and mixed with a mechanical stirrer at a speed of 1500 rpm for 80 minutes. During the mixing process, the temperature was set to 160 ± 1 °C and the temperature was kept constant by putting on an electric heating mantle. A self-healing asphalt material based on carbon nanotube / graphene / rubber composite modification was prepared.

[0057] In this example, CNT and graphene are fully dispersed into the matrix asphalt through manual stirring and high shearing, and then molten rubber is added to disperse into the aforementioned mixture. The mass ratio of carbon nanotubes, graphe...

Embodiment 2

[0059] (1) Disperse 2.5g of CNT and 2.5g of graphene in 15g of molten rubber first, and disperse CNT and graphene in the rubber by extrusion to prepare a carbon nanotube / graphene / rubber composite material.

[0060] (2) Disperse the prepared 20g carbon nanotube / graphene / rubber composite material in 180g molten pitch, carry out high-speed shearing at a speed of 6000rpm for 60 minutes, and then use a mechanical stirrer to mix at a speed of 2000rpm for 100 minutes. During the process, the temperature was set at 160±1°C and kept constant by putting on an electric heating mantle. A self-healing asphalt material based on carbon nanotube / graphene / rubber composite modification was prepared.

[0061] In this example, CNT and graphene are fully dispersed into the rubber matrix by extrusion and dispersion, and then the prepared carbon nanotube / graphene / rubber composite material is added into molten asphalt, and dispersed by high-speed shearing, so that the The mass ratio of carbon nanotu...

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Abstract

The invention relates to the technical field of road engineering materials, in particular to a self-healing asphalt material and a preparation method and application thereof. Graphene, 1%-30% rubber powder, 70%-95% base asphalt. The self-healing asphalt material is modified by carbon nanotube / graphene / rubber composite, which not only increases the self-healing performance of the asphalt material, but also makes it possible to repair the micro-cracks in the asphalt material in a short time under the action of microwave or inductance ; The hybridization of carbon nanotubes and graphene has a synergistic effect on the conductivity of the material, and the thermal healing of asphalt can be quickly achieved through electrothermal and magnetic thermal technologies; The base asphalt has the effect of modification and significantly improves the road performance of the asphalt material. The polymer rubber powder used in the present invention is all taken from waste rubber tires, which can alleviate the problem of environmental pollution caused by waste tires, so it has more application prospects.

Description

technical field [0001] The invention relates to the technical field of road engineering materials, in particular to a self-healing asphalt material and a preparation method and application thereof. Background technique [0002] The information disclosed in this Background section is only for enhancement of understanding of the general background of the invention and should not necessarily be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art. [0003] The transportation system plays a leading and fundamental role in the development of the national economy. The vast majority of highways in our country use asphalt concrete pavement. Under the repeated action of vehicles, the asphalt concrete pavement is gradually cracked and damaged. Therefore, the maintenance and repair of highways, especially highways, is imminent. [0004] At present, the treatment measures for cracks and ot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L95/00C08L21/00C08K3/04
CPCC08L95/00C08L21/00C08K3/041C08K3/042
Inventor 梁明苏林萍仇正梅荣玉辛雪姚占勇蒋红光姚凯张吉哲
Owner SHANDONG UNIV
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