Resin colloid repair material and repair method of cracked and damaged reinforced concrete structure

A resin colloid and repair material technology, applied in epoxy resin glue, adhesive, building maintenance and other directions, can solve the problems of insecure repair effect, high cost, structural damage, etc., to improve durability, wide application range, The effect of reducing the concentration

Active Publication Date: 2022-07-01
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are many repair methods for damaged reinforced concrete structures, but these methods cannot effectively repair cracked damaged reinforced concrete structures.
For example, the electrodeposition repair method can use the electric field conditions to make the deposited salt seal the concrete cracks, but the deposited salt has large pores and cannot prevent the external erosive medium from penetrating into the concrete; the main purpose of the electrochemical re-alkali method is to restore the alkalinity of the carbonized concrete, and the method has a single function ;The material replacement method has certain requirements on time and space, and the repair effect cannot be guaranteed, the repair process is complicated and the cost is high; the grouting method often needs to open holes, and the pressure during the grouting process is easy to cause damage to the structure if it is not properly controlled
[0004] It can be seen that there is a lack of efficient repair methods for cracked and damaged reinforced concrete structures at this stage.

Method used

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  • Resin colloid repair material and repair method of cracked and damaged reinforced concrete structure
  • Resin colloid repair material and repair method of cracked and damaged reinforced concrete structure
  • Resin colloid repair material and repair method of cracked and damaged reinforced concrete structure

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preparation example Construction

[0056] The preparation method of the water-based cationic resin is as follows: after stirring and preheating the base resin, adding an alcohol amine, then heating up to carry out a modification reaction to obtain a modified epoxy resin; adding an organic acid after cooling down, and carrying out a protonation reaction to obtain a water-based cationic resin Cationic resin. The preheating temperature is 50-60°C; the temperature of the modification reaction is 70-85°C, and the time is 2-4h; the temperature of the protonation reaction is 55-65°C, and the time is 30-60min; the base resin, alcoholamine, The molar ratio of the organic acid is 1:(0.6-1.5):(0.3-1.4).

[0057] When preparing the water-based cationic resin curing agent, the molar ratio of enamine, base resin and end-capping agent is (2-2.6):(1-1.3):(2-2.6); the temperature of addition reaction is 60-80℃ , the time is 3-5h; the temperature of the end-capping reaction is 60-80 ℃, and the time is 3-5h.

[0058] In the res...

Embodiment 1

[0063] A high-performance resin colloid repair material, the preparation method of which is as follows:

[0064] 1. Synthesis of cationic epoxy resin

[0065] In a four-necked flask equipped with a stirrer, a condenser, a constant pressure funnel, and a thermometer, add bisphenol A epoxy resin E44, stir and preheat at 50-60°C, slowly drop diethanolamine, and heat up to 70- The modified epoxy resin was obtained after reacting at 85°C for 2-4 hours. Then, the temperature is lowered to 60°C, and organic acids (eg, glacial acetic acid, itaconic acid, maleic acid) are added to neutralize and form salts. After 30-60 minutes of reaction, a transparent colloid is obtained, which is a water-based cationic epoxy resin. The molar ratio of bisphenol A epoxy resin E-44, diethanolamine and organic acid is 1:0.6:0.3-1:1.5:1.4.

[0066] 2. Synthesis of cationic epoxy resin curing agent

[0067] Using enamine (such as diethylenetriamine, triethylenetetramine, tetraethylenepentamine) and bis...

Embodiment 2

[0071] A high-performance resin colloid repair material, the preparation method of which is as follows:

[0072] 1. Synthesis of cationic epoxy resin

[0073] In a four-necked flask equipped with a stirrer, a condenser, a constant pressure funnel, and a thermometer, add bisphenol A epoxy resin E51, stir and preheat at 50-60 ° C, slowly drop diethanolamine, and heat up for a period of reaction Modified epoxy resin is obtained after time. Then cool down to 60 ℃, add organic acid to neutralize and form salt (neutralization degree is not higher than 90%), and obtain transparent colloid after 30 minutes of reaction, which is water-based cationic epoxy resin, bisphenol A epoxy resin E51, diethanolamine, The molar ratio of the organic acid is 1:0.6:0.3-1:1.5:1.4.

[0074] 2. Synthesis of cationic epoxy resin curing agent

[0075] Using enamine and E51 as raw materials, the reaction temperature is 60-80 °C, and the reaction time is 3-5 h to synthesize the enamine epoxy resin adduct...

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Abstract

The invention relates to a resin colloid repairing material and a repairing method of a cracked and damaged reinforced concrete structure, and the preparation method of the resin colloid repairing material comprises the following steps: mixing water-based cationic resin, a water-based cationic resin curing agent and water to obtain the resin colloid repairing material, the repairing method comprises the following steps: cleaning cracks in a to-be-repaired area, connecting a negative electrode of a direct-current power supply to steel bars in the to-be-repaired area, enabling the steel bars in the to-be-repaired area to be in contact with a resin colloid repairing material in a liquid storage device, connecting a positive electrode of the direct-current power supply to an anode plate, enabling the anode plate to be in contact with the resin colloid repairing material in the liquid storage device, and repairing the to-be-repaired area. And then electrifying and repairing. Compared with the prior art, the method has the advantages that the cracked and damaged reinforced concrete structure can be repaired in a lossless manner, and defects and cracks in the concrete can be filled and bonded while a resin protective film is generated on the surface of the reinforcing steel bar, so that the durability of the cracked and damaged reinforced concrete structure is improved.

Description

technical field [0001] The invention belongs to the technical field of repairing reinforced concrete structures damaged by cracking, and relates to a resin colloid repair material and an electrochemical repairing method for reinforced concrete structures damaged by rust expansion and cracking. Background technique [0002] As the world's third largest superpower in terms of land area, China has a land area of ​​more than 9.6 million square kilometers, which means that structures and building structures composed of reinforced concrete will serve in various unfavorable environments, accelerating the cracking and damage of reinforced concrete structures. The durability of the corresponding buildings or structures is reduced, and the service life is shortened. [0003] At present, there are many repair methods for deteriorating damaged reinforced concrete structures, but these methods cannot effectively repair cracked and damaged reinforced concrete structures. For example, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J163/02C08G59/14C08G59/50C25D13/06E04G23/02
CPCC09J163/00C08G59/1477C08G59/5006C25D13/04E04G23/0203E04G23/0218
Inventor 王月明王长丹周顺华王炳龙陈凯祥
Owner TONGJI UNIV
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