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Chlorine salt corrosion resistant system with chemical microcapsule for underground structure concrete

An underground structure and concrete technology, applied in the field of concrete engineering, can solve the problems such as the inability to effectively control the diffusion of chloride salts for a long time, the construction of anti-corrosion coatings is difficult, and the inability to prevent the diffusion of chloride salts, etc. Improved safety, durability, and extended service life

Active Publication Date: 2013-03-27
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] 1) Although some problems can be solved by improving the design grade of concrete and improving the protective ability of concrete and its steel bars, practice has proved that it is still unable to effectively control the diffusion of chloride salts for a long time
[0017] 2) The construction is difficult when using anti-corrosion coating, and the coating is easy to fall off
[0018] 3) The further diffusion of chlorine salts cannot be prevented in the later stage

Method used

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  • Chlorine salt corrosion resistant system with chemical microcapsule for underground structure concrete
  • Chlorine salt corrosion resistant system with chemical microcapsule for underground structure concrete
  • Chlorine salt corrosion resistant system with chemical microcapsule for underground structure concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Preparation of chemical microcapsules: AgNO with a concentration of 219g / 100mL 3 aqueous solution, the AgNO 3 The aqueous solution is wrapped in chemical microcapsules made of polyurea formaldehyde.

[0059] Prepare chemical microcapsules by traditional in-situ polymerization method: Weigh 50 grams of urea and 90 grams of formaldehyde to make a mixed solution, adjust the pH to 8-9 with dilute NaOH solution, and then conduct a heating reaction in a water bath for a period of time until it is completely dissolved to obtain prepolymerization body. Emulsify the silver nitrate solution in SDBS (sodium dodecylbenzenesulfonate) solution for a period of time, then add it to the prepolymer solution and adjust the pH to 2-2.5 with a dilute acid solution, and at the same time raise the temperature to 55°C and stir the reaction 2 Hours, then raise the temperature to 65°C for reaction, then wash with acetone and distilled water, filter with suction, and dry to obtain chemical micr...

Embodiment 2

[0064] With reference to the method in embodiment 1, respectively to AgF aqueous solution, Hg 2 (NO3) 2 Aqueous solution, Pb(NO 3 ) 2 Aqueous solution, TiNO 3 The aqueous solution was tested, and the specific experimental conditions are shown in Table 1. Each microcapsule is prepared by traditional in-situ polymerization method.

[0065] Table 1

[0066]

AgF aqueous solution

Pb(NO 3 ) 2 aqueous solution

Hg 2 (NO3) 2 aqueous solution

TiNO 3 aqueous solution

configuration concentration

180g / 100mL

56g / 100mL

6g / 100mL

5g / 100mL

chemical microencapsulation material

polyvinyl alcohol

Urea-formaldehyde resin

polyurethane rubber

polyurea

Chemical microcapsule diameter

100μm

950μm

300μm

200μm

Chemical Microcapsule Wall Thickness

0.3μm

5μm

1μm

3μm

volume of microcapsules

5%

15%

5%

5%

[0067] The resulting AgF aqueous solution,...

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Abstract

The invention relates to the field of concrete engineering, and especially relates to a chlorine salt corrosion resistant system with chemical microcapsule for underground structure concrete. The invention relates to the field of concrete engineering, and especially relates to a chlorine salt corrosion resistant system with chemical microcapsule for underground structure concrete. Compared with an existing chloride corrosion resistance method, the chloride corrosion resistance system provided by the invention has the following advantages: the system can realize intelligent control of chloride concentration by concrete, reduce chlorine salt corrosion, and produce precipitate to block a channel corroded by chlorine salt while reducing the chloride ion concentration; the microcapsules can protect the internal repair agent from outside influence, so as to realize long-time effectiveness of chlorine salt corrosion resistance of the repair agent; and compared with an anticorrosive coating, the chlorine salt corrosion resistant system can realize large-scale multiple rehabilitation due to a large amount of chemical microcapsules evenly distributed in the concrete matrix.

Description

technical field [0001] The invention relates to the field of concrete engineering, in particular to an underground structure concrete chemical microcapsule anti-chloride salt corrosion system. Background technique [0002] Underground structures (such as urban rail transit tunnel structures) have a design life of 100 years, where the rock and soil conditions are complex, the surrounding environment is sensitive, the train running density is extremely high, and the service conditions are harsh. Once damaged, it is difficult or irreplaceable, and will induce underground engineering disasters. Reinforcement corrosion is the dominant factor affecting the durability of reinforced concrete structures, as recorded in Wang Chunfu, Wang Yuling, Reinforced Concrete Chloride Ion Corrosion Mechanism and Protective Measures [J], Commodity Concrete, 2010, 3: 56-58, among many corrosion factors Among them, chloride salt is the most important factor causing corrosion damage to a wide range...

Claims

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Application Information

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IPC IPC(8): C04B22/12C04B103/61
Inventor 闫治国周帅朱合华陈庆
Owner TONGJI UNIV
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