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Single-component healing capsule and self-healing concrete

A one-component, concrete technology, applied in the field of engineering materials, can solve the problems of difficult penetration of the healing agent, low self-healing efficiency, high viscosity, etc., and achieve the effects of good fluidity, high healing efficiency, and low viscosity

Inactive Publication Date: 2017-05-31
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The two-component healing agent means that the adhesive needs to contact the second component in the concrete to react. Because the curing reaction of the two-component healing agent requires high mixing uniformity, in the case of uneven mixing of the two components , curing is very difficult, and the healing effect cannot be achieved, such as two-component healing agents such as epoxy resin and methyl methacrylate, etc.
[0005] One-component healing agents avoid the problem of uneven mixing of two-component healing agents, and most of them can be cured only by contacting moisture or air, such as cyanoacrylate, neoprene single-component healing agents, etc., but currently used The one-component healing agent cures quickly, and once the capsule cracks, the healing agent contained in it is prone to failure; or the viscosity is high, making it difficult for the healing agent to penetrate into small cracks and pores, and the self-healing efficiency is low

Method used

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  • Single-component healing capsule and self-healing concrete
  • Single-component healing capsule and self-healing concrete
  • Single-component healing capsule and self-healing concrete

Examples

Experimental program
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preparation example Construction

[0030] The present invention has no special limitation on the preparation method of the one-component healing capsule, and the technical solution for the preparation of the one-component healing capsule well-known to those skilled in the art can be adopted. In the present invention, the preparation of the one-component healing capsule preferably includes the following steps:

[0031] Mix polyurethane with diluent to obtain a one-component healing agent;

[0032] Injecting the one-component healing agent into the capsule wall with one end closed to obtain a semi-closed capsule;

[0033] The opening end of the semi-closed capsule is blocked with a plugging material to obtain a one-component healing capsule.

[0034] In the present invention, the closed capsule wall is preferably a single open capsule wall, or a double open capsule wall with a plugging material blocked at one end. In the present invention, there is no special limitation on the injection method of the one-compon...

Embodiment 1

[0044] The structural diagram of the capsule in this embodiment is as follows: figure 1 As shown, the cross-sectional view of the capsule is shown in figure 2 As shown, an open-ended quartz glass tube 2 with an inner diameter of 9 mm, a wall thickness of 1 mm, and a length of 30 mm is used, and one end of the tube is sealed with a plexiglass (acrylic material) sheet 1 with a diameter of 10 mm and a thickness of 2 mm. Then use a syringe to inject optimized polyurethane healing agent (ratio of acetone to polyurethane mass is 0.2), after filling up, use plexiglass sheet 1 to block the other end. The cementing material used for sealing is α-ethyl cyanoacrylate, and it is ensured that there is no excess air in the tube to obtain a one-component healing capsule.

[0045] The viscosity of the healing agent was measured by an Anton Paar MCR302 rheometer parallel plate experiment, the temperature was set at 20°C, and the shear rate was from 1s -1 Increase to 10000s -1 , measure the...

Embodiment 2

[0047] Prepare cement mortar according to the ratio of water: cement: aggregate=1:1:3, first pour the mortar into half of the mold (160mm×40mm×40mm); then put one single-component healing capsule prepared in Example 1 horizontally Parallel to the center of the mold filled with half of the mortar, the capsule is placed in the same direction as the mold; finally fill the mold with mortar, and place the mold on a vibrating table for slight vibration and compaction; the sample is kept at 20°C and a relative humidity of 90 % constant temperature and humidity curing box for curing, demoulding after 12 hours to obtain self-healing concrete.

[0048] Performance testing of self-healing concrete:

[0049] After 14 days of curing, the cracks of the healed sample were produced by the three-point bending test. During the test, the capsule cracking sound could be clearly heard, and the glass capsule did not slip in the concrete, which met the test requirements for the capsule to rupture wi...

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Abstract

The invention provides a single-component healing capsule and self-healing concrete. The single-component healing capsule provided by the invention comprises a capsule wall, a plugging material plugged at the opening of the capsule wall and a single-component healer plugged in the capsule wall, wherein the single-component healer comprises polyurethane and diluter. The single-component healing capsule provided by the invention takes a mixture of polyurethane and diluter as the healer, and the intermolecular action force of the polyurethane is changed through dilution of the diluter, so that the healer has favorable flowability, and the healer can flow evenly in a crack and be solidified and cemented within certain time after the capsule is ruptured. Experimental results indicate that the healer can be uniformly released into the crack after the single-component healing capsule is ruptured; crack healing is realized through cementation with concrete; and the healing efficiency can be up to 32.2% one day after two capsules are ruptured, the healing efficiency can be up to 77.6% two days after two capsules are ruptured, and the healing efficiency can be up to 75.2% three days after two capsules are ruptured.

Description

technical field [0001] The invention relates to the technical field of engineering materials, in particular to a single-component healing capsule and self-healing concrete. Background technique [0002] Concrete is now a widely used building material, but it will be damaged and produce micro-cracks under the action of force or other factors during use. These damages are invisible, but if they cannot be repaired in time, the mechanical properties of concrete will be reduced, and even Macroscopic cracks may be induced, allowing water to infiltrate and lead to corrosion of steel bars, reducing the earthquake resistance and service life of concrete structures. At present, the main method adopted in the anti-seismic design of structures is to increase the size of the structure and increase the amount of steel bars, but this not only increases the cost of the structure, but also is not beautiful; and the manual passive repair of concrete cracks is also very time-consuming, labor-i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/60C04B28/04
CPCC04B28/04C04B41/60C04B2201/50C04B14/068
Inventor 胡相明胡尊翔吴明跃程卫民赵艳云
Owner SHANDONG UNIV OF SCI & TECH
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