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Crack plugging and tracing system, and preparation method and application of microcapsule

A microcapsule and tracer technology, applied in the field of crack repair, can solve problems such as carbonization, affecting the durability and safety of concrete materials, and defects in auxiliary materials, and achieve the effect of prolonging the degradation time and avoiding premature cracking

Pending Publication Date: 2021-04-06
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to creep, environmental humidity changes, and uneven settlement of concrete materials during service, cracks will occur, and moisture and other harmful substances will penetrate into the interior of the concrete material matrix through micro-cracks, which will lead to strength reduction, carbonization, steel corrosion, etc. A series of problems, which in turn seriously affect the durability and safety of concrete materials
Moreover, these cracks will cause crevice corrosion, and the corrosive medium will enter the main material of the tower foot along these cracks to accelerate the corrosion of the steel structure
[0004] Existing ultrasonic surface Lamb wave detection is often effective only when the corrosion pit of the main material is deep or the auxiliary material has a large area of ​​defects.
The detection of substation inspection robots requires high contrast

Method used

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  • Crack plugging and tracing system, and preparation method and application of microcapsule
  • Crack plugging and tracing system, and preparation method and application of microcapsule
  • Crack plugging and tracing system, and preparation method and application of microcapsule

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] (1) The raw material composition of microcapsule:

[0058] The core material of the first reaction microcapsule is epoxy resin with an epoxy value of 0.45, and the wall material is polyethylene.

[0059] The core material of the second reaction microcapsule is 1,2-propylenediamine, sodium silicate, DMP-30 and nonylphenol, and the wall material is polyethylene. Among them, the mass ratio of 1,2-propylenediamine and sodium silicate amine is 5:1, and the mass ratio of DMP-30 and nonylphenol is 2:1.

[0060] The core material of the tracer microcapsule is cyclohexanedicarboxylic acid, sodium α-alkenyl sulfonate, crotonic acid, ethanol solution and azobisisobutyronitrile, and the wall material is polyethylene. The preparation method of the core material of tracer microcapsule is as follows:

[0061] Add cyclohexanedicarboxylic acid, sodium α-alkenyl sulfonate, crotonic acid, ethanol solution and azobisisobutyronitrile in a mass ratio of 0.4:10:13:20:0.002 into a high-press...

Embodiment 2

[0078] Taking the first reaction microcapsules as an example, under the premise that other conditions are the same, only the dry hot air blowing condition of step (2) in embodiment 1 is changed, and 9 groups of experiments are designed to observe the effect of the dry hot air blowing condition on the formation of microcapsules. Impact. The conditions of the test and the molding conditions of the microcapsules are shown in Table 2 below. According to the data analysis, under the condition that the temperature of the lower mold is 15°C, the temperature of the hot air is 80°C, and the blowing time is 1s, the molding condition of the microcapsules is the best.

[0079] Table 2

[0080]

Embodiment 3

[0082] The first reaction microcapsules, the second reaction microcapsules and the tracer microcapsules prepared in Example 1 are poured into the tower foundation concrete that has been stirred evenly and not solidified with a pouring device in a ratio of 1:1:1 by weight. Material, and then clad on the main material of tower base tower foot. Make sure that the three kinds of microcapsules are mixed into the concrete material of the base tower foot, and the distribution area of ​​the three kinds of microcapsules in the concrete material is within 5mm-10mm from the main material of the tower foot, and more than 15mm away from the outer surface of the concrete material. Use vibrating equipment to vibrate the concrete pool at the base of the tower. After the concrete material is solidified, use a black light (320-420nm) and a defect photographing device (including a photographing device with an ultraviolet sensitive screen) to trace and detect the coating position of the tower foo...

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Abstract

The invention belongs to the technical field of crack repairing. The invention provides a crack plugging and tracing system, and a preparation method and application of microcapsules. The first reaction microcapsules and the second reaction microcapsules are released and react after being broken under the stress generated by the cracks, and reactants are filled in the local cracks to block the diffusion of the cracks. Core materials of the tracing microcapsules have certain salt content resistance and ultraviolet decomposition capacity, fluorescence tracing can be conducted on the expansion track of the cracks under an ultraviolet lamp so that the corrosion condition can be known in time, solutions can be taken, and repairing and nondestructive testing of the tower footing concrete cracks can be conducted. The microcapsule prepared through the preparation method is good in forming effect, high in uniformity, high in weather resistance, more concentrated in particle distribution and better in strength, only cracks are generated under the action of strong stress generated by the cracks, the repairing effect is achieved, and the microcapsule is very suitable for plugging and tracing of corrosion cracks of iron tower concrete structures.

Description

technical field [0001] The application belongs to the technical field of crack repair, and in particular relates to a crack plugging and tracer system, a preparation method and application of microcapsules. Background technique [0002] The lower part of the steel structure of the transmission tower is the junction between the tower and the soil, which is prone to corrosion. Corrosion causes the main material of the tower foot to thin, which is likely to endanger the safety of the entire tower. The conventional anti-corrosion method currently adopted is to cover a layer of concrete material outside the main material. [0003] However, due to creep, environmental humidity changes, and uneven settlement of concrete materials during service, cracks will occur, and moisture and other harmful substances will penetrate into the interior of the concrete material matrix through micro-cracks, which will lead to strength reduction, carbonization, steel corrosion, etc. A series of pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/28C04B24/12C04B24/16G01N21/64B01J13/04
CPCC04B20/1033G01N21/643B01J13/04G01N2021/6439C04B24/281C04B24/121C04B12/04C04B24/02C04B24/04C04B24/16C04B24/129
Inventor 岳楹超董重里聂铭黄丰倪惠浩
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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