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Preparation method of shrinkage compensation type asphalt self-healing capsule

A kind of asphalt self-healing and capsule technology, applied in the field of materials, can solve the problems of difficult to meet the actual application requirements, low coating rate of asphalt rejuvenator, loss of asphalt rejuvenator, etc., to improve self-healing performance and save maintenance costs , the effect of reducing loss

Inactive Publication Date: 2021-02-26
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, calcium alginate asphalt self-healing capsules will produce syneresis during the drying process, resulting in serious loss of asphalt rejuvenator, low coating rate of asphalt rejuvenator, and low strength of calcium alginate asphalt self-healing capsules. It is easy to release the asphalt rejuvenator prematurely under the action, which is difficult to meet the actual application requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Four kinds of rapid hardening cement / calcium alginate composite wall materials asphalt self-healing capsules were prepared. First prepare four cups of 400ml, 2.0wt% industrial-grade sodium alginate solution, then add 0g, 4g, 6g, and 8g of rapid-hardening cement respectively, and the fineness of the rapid-hardening cement is 325 meshes. Minutes, the shear rate is 4000 rpm. Then add 40ml of bitumen regenerant and 1ml Tween 80 (surfactant) to the mixture, and then shear at a high speed for 10 minutes under a shearing machine at a shear rate of 4000 rpm. The numbers of the obtained mixed solution are A1, A2, A3, A4 in sequence. At the same time, a calcium chloride solution with a concentration of 2.5 wt% was prepared, and the sheared blend solution was dropped into the calcium chloride solution drop by drop, and reacted for 6 hours to form four different wet capsules. Finally, it was ventilated at room temperature for 72 hours, and four different capsules were obtained af...

Embodiment 2

[0029] Two shrinkage-compensating rapid-hardening cement / calcium alginate composite wall materials asphalt self-healing capsules were prepared. First prepare a cup of 400g, 2.0wt% sodium alginate solution, add 16g of rapid hardening cement (accounting for 200% of the mass of sodium alginate solute), and record the mixed solution as A1. Then prepare a cup of 400g, 1.0wt% sodium alginate solution, 2g rapid hardening cement (accounting for 25% of the solute mass of sodium alginate), and this mixed solution is recorded as B1. Under the shearing machine, shear at high speed for 10 minutes respectively, and the shear rate is 4000 rpm. Then add 40ml of sunflower oil (asphalt regenerant) and 1ml of Tween 80 (surfactant) to the mixture, and then shear at high speed for 10 minutes under the shearing machine, and the shear rate is 4000 rpm. The emulsions made by A1 and B1 were dropped into calcium chloride solution with a concentration of 2wt%, and it was found that the emulsion made by...

Embodiment 3

[0031] To prepare two kinds of calcium alginate capsules, first prepare 400ml of 2.0wt% sodium alginate solution respectively, then add 0g and 8g of rapid hardening cement respectively, and shear at high speed under a shear for 10 minutes at a shear rate of 3500 rpm / minute. Then add 40ml of sunflower oil (regenerator) and 1ml Tween 80 (surfactant) to the mixture, and then shear at high speed for 10 minutes under a shearing machine at a shear rate of 4000 rpm. The above two mixed solutions were dripped into calcium chloride solution with a concentration of 2wt% to prepare capsules A (common capsule) and B (shrinkage compensation capsule), and after 72 hours of natural ventilation and drying, the two capsules were mixed with asphalt respectively. In the mixture (the dosage is 0.5wt%), carry out the fatigue load test (to induce the release of the asphalt regenerant) to the prepared asphalt mixture girder specimen. The fatigue load test conditions are: the temperature is 20°C, th...

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Abstract

The invention discloses a preparation method of a shrinkage compensation type asphalt self-healing capsule. The method includes: preparing an industrial-grade sodium alginate solution; adding quick-hardening cement, and carrying out high-speed shearing dispersion to obtain a mixed solution of sodium alginate and quick-hardening cement; adding an asphalt regenerant and a surfactant into the obtained mixed solution, and uniformly shearing and dispersing at a high speed to obtain a blended solution; dropwise adding the obtained blended solution into a calcium chloride solution, and stirring for reaction to form a wet capsule; and filtering out the wet capsule, and cleaning and drying the wet capsule to obtain the shrinkage compensation type asphalt self-healing capsule. Due to the addition ofthe quick-hardening cement, the problems of volume shrinkage of the calcium alginate asphalt self-healing capsule in the dehydration drying process and asphalt regenerant loss caused by the volume shrinkage can be effectively reduced, so that the content of the regenerant is increased; meanwhile, the quick-hardening cement has an obvious reinforcing effect on the wall of the calcium alginate capsule, so that the calcium alginate asphalt self-healing capsule can be prevented from releasing the asphalt repairing agent too early.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of shrinkage compensation type asphalt self-healing capsules. Background technique [0002] Adding capsules coated with asphalt rejuvenator to asphalt concrete to improve the healing performance of the pavement and prolong the service life of the pavement has become the concept of asphalt pavement maintenance advocated by researchers at home and abroad. The calcium alginate self-healing capsules coated with asphalt rejuvenator have the characteristics of elasticity and load-controlled release. Under the action of cyclic load, the asphalt rejuvenator in the chamber can be gradually released due to elastic shrinkage, which is expected to solve the aging and cracking problems of asphalt pavement at the same time. However, calcium alginate asphalt self-healing capsules will produce syneresis during the drying process, resulting in serious loss of as...

Claims

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Application Information

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IPC IPC(8): C04B24/38
CPCC04B40/0046C04B24/38C04B7/00C04B2103/0068C04B24/32C04B22/124
Inventor 刘全涛饶文浩张登峰吴少鹏於鑫谢君陈美祝
Owner WUHAN UNIV OF TECH
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