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Long-term self-healing asphalt concrete based on stress-responsive multi-chamber capsules

An asphalt concrete, self-healing technology, applied in the field of materials, can solve the problems of potholes, micro-cracks, and easy aging of asphalt pavement.

Active Publication Date: 2021-06-08
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the effect of traffic load and natural environment, asphalt pavement is easy to age, and micro-cracks will occur under the action of temperature and load, and then develop into cracks, loose, potholes and other macroscopic diseases, which need timely repair and maintenance

Method used

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  • Long-term self-healing asphalt concrete based on stress-responsive multi-chamber capsules
  • Long-term self-healing asphalt concrete based on stress-responsive multi-chamber capsules
  • Long-term self-healing asphalt concrete based on stress-responsive multi-chamber capsules

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dissolve 75g of sodium alginate in 3000ml of water at 50°C to form a sodium alginate solution with a concentration of 2.5%. After the sodium alginate solution is cooled to room temperature, it is mixed with 385g of asphalt regenerant and 9.6g of Tween 80. The cutting rate is 4000 rpm, and the shearing time is 15 minutes; under the action of magnetic stirring at 60 rpm, the mixture of sodium alginate, asphalt regenerant and Tween 80 is dripped at a rate of 60 drops / min 50°C, 500g of 3% calcium chloride solution, after all the mixed solution is dropped into the calcium chloride solution, continue to stir and react at 50°C for 4 hours, wash with distilled water, and dry with forced ventilation for 24 hours to obtain a stress-responsive multi-chamber self-healing capsule , the capsule particle size is 2.1mm, and the regenerant coating rate is 67.2%.

[0024] Repeat the above preparation method, but do not add surfactant Tween 80, the shear rate is 2000 rpm, and the shear ti...

Embodiment 2

[0029] Dissolve 90g of sodium alginate in 3000ml of water at 55°C to form a sodium alginate solution with a concentration of 3%. After the sodium alginate solution is cooled to room temperature, it is mixed with 340g of asphalt regenerant and 8.8g of Tween 80. The cutting rate is 5500 rpm, and the shearing time is 10 minutes; under the action of magnetic stirring at 100 rpm, the mixture of sodium alginate, asphalt regenerant and Tween 80 is dripped at a rate of 80 drops / min 55°C, 600g of 3% calcium chloride solution, after all the mixed solution was dropped into the calcium chloride solution, continue to stir and react at 55°C for 3h, wash with distilled water, and dry with forced ventilation for 24h to obtain a stress-responsive multi-chamber capsule.

[0030] Using SMA-13 ​​gradation, the mass percentage of each raw material is: 86.3% of coarse and fine aggregate, 8.7% of mineral powder, 5.6% of asphalt, and 0.6% of stress-responsive multi-chamber capsule (the regenerant coat...

Embodiment 3

[0032] Dissolve 90g of sodium alginate in 3000ml of water at 50°C to form a sodium alginate solution with a concentration of 3%. After the sodium alginate solution is cooled to room temperature, it is mixed with 1030g of asphalt regenerant and 25.8g of Tween 80. The cutting rate is 5000 rpm, and the shearing time is 10 minutes; under the action of magnetic stirring at 80 rpm, the mixture of sodium alginate, asphalt regenerant and Tween 80 is dripped at a rate of 100 drops / min. 50°C, 700g of 2.5% calcium chloride solution, after all the mixed solution was dropped into the calcium chloride solution, continue to stir and react at 50°C for 4h, wash with distilled water, and dry with forced ventilation for 24h to obtain a stress-responsive multi-chamber capsule.

[0033]Using Superpave-12.5 gradation, the mass percentages of each raw material are: coarse and fine aggregate 88.2%, mineral powder 6.9%, asphalt 4.9%, stress-responsive multi-chamber capsule 0.4% (capsule regeneration ag...

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Abstract

The invention discloses a long-acting self-repairing asphalt concrete based on a stress-responsive multi-chamber capsule. Prepared by asphalt mixture mixed with 0.4-0.6wt% stress-responsive multi-chamber self-repairing capsule; dissolving sodium alginate in water to prepare sodium alginate solution; after cooling to room temperature, mix with asphalt regeneration agent and surfactant Tween 80 shear mixing, the shear rate is 4000-5500 rpm, the shear time is 10-15 minutes; under the action of magnetic stirring at 60-100 rpm, the obtained liquid is mixed at 60-100 drops / min Drop it into the calcium chloride solution at 50-55°C at a high rate; continue to react for 3-4 hours after dropping, wash with distilled water and dry to obtain. The invention is an elastic capsule containing many cavities, the asphalt regeneration agent is distributed in these cavities and can be released automatically under the action of cyclic load, so as to automatically soften the aged asphalt and repair the microcracks in the asphalt concrete.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a long-acting self-repairing asphalt concrete. Background technique [0002] Asphalt pavement has the advantages of flat and seamless surface, small driving vibration, low noise, fast open traffic after paving, and convenient maintenance. It has been more and more widely used in high-grade highways and municipal roads. At present, my country has paved more than 1 million kilometers of asphalt roads. However, due to traffic loads and the natural environment, asphalt pavement is prone to aging, and micro-cracks will occur under the action of temperature and load, and then develop into macroscopic diseases such as cracks, looseness, and potholes, which require timely maintenance. It is an advanced asphalt pavement maintenance concept to repair the asphalt pavement before macroscopic diseases appear. The invention utilizes the stress-responsive multi-chamber capsule to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B26/26C04B24/38C04B111/34
CPCC04B26/26C04B40/0039C04B2111/343C04B18/141C04B14/00C04B14/48C04B20/0008C04B24/38C04B2103/0068C04B24/283C04B22/124
Inventor 刘全涛包士文吴少鹏张雷谢君陈美祝
Owner WUHAN UNIV OF TECH
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