Concrete autolysis chemical sulfate corrosion resistance system in water environment

A sulfate-resistant concrete technology, applied in the field of concrete engineering, can solve problems such as limited repair effect, failure to prevent sulfate diffusion, and difficulty in anti-corrosion coating construction, and achieve the effect of slow release of sulfate-resistant corrosion effects

Active Publication Date: 2016-06-08
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] (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 sulfate corrosion for a long time
Moreover, the corrosion resistance index of sulfate-resistant cement stipulates that SO 4 2- The concentration is 2500mg / L, but in fact SO 4 2- The concentration of sulphate-resistant cement often exceeds this index, and ordinary sulfate-resistant cement cannot meet the actual engineering needs;
[0021] (2) The construction is difficult when the anti-corrosion coating is used, and the coating is easy to fall off;
[0022] (3) The further diffusion of sulfate cannot be prevented in the later stage
The repair effect of the microcapsules is limited by the crack development orientation of the concrete structure; at the same time, due to the stress-sensitive characteristics of the capsule wall, it is often damaged during the mixing and pouring of the concrete matrix, resulting in failure; in addition, due to its own characteristics, the microcapsules are The role of the agent is often in a short period of time after the capsule is damaged, which cannot meet the long-term requirements of sulfate corrosion resistance

Method used

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  • Concrete autolysis chemical sulfate corrosion resistance system in water environment
  • Concrete autolysis chemical sulfate corrosion resistance system in water environment
  • Concrete autolysis chemical sulfate corrosion resistance system in water environment

Examples

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Embodiment 1

[0081] A concrete self-dissolving chemical anti-sulfate corrosion system in a water environment, including a concrete matrix and porous silica microspheres in the concrete matrix. Dissolvable protective film. The porous silica microspheres are spherical, with a particle size of 1.5-2 μm and a specific surface area of ​​about 60.06m2 / g, the average pore diameter is 32.17nm. Restorative agent is Ba(NO 3 ) 2 , The material of the self-dissolving protective film is polyvinylpyrrolidone K30 with a molecular weight of 40,000. The porous silica microsphere accounts for 10% by mass of the cementitious material in the concrete matrix.

[0082] The preparation method of the concrete self-dissolving chemical sulfate corrosion resistance system under the water environment is as follows:

[0083] (1) Preparation of silica microspheres

[0084] Mix 100ml isopropanol (analytical pure) and 90ml deionized water evenly, add 1g hexadecylamine (analytical pure), ultrasonically mix, then add...

Embodiment 2

[0095] This example is basically the same as Example 1, except that the porous silica microspheres in this example have not undergone the step of pore expansion.

Embodiment 3

[0097] A concrete self-dissolving chemical anti-sulfate corrosion system in a water environment, including a concrete matrix and porous silica microspheres in the concrete matrix. Dissolvable protective film. The porous silica microspheres are spherical, with a particle size of 0.5-1 μm and a specific surface area of ​​about 80m 2 / g, the average pore diameter is 20nm. The repair agent is Pb(NO 3 ) 2 , The material of the self-dissolving protective film is polyvinylpyrrolidone K90. The porous silica microsphere accounts for 15% by mass of the cementitious material in the concrete matrix. The concrete self-dissolving chemical sulfate corrosion resistance system prepared in this example can be effective for a long time, and can improve the sulfate corrosion resistance of concrete structures on a large scale, and establish an underground structural concrete that is intelligently resistant to sulfate corrosion system, improve the safety and durability of underground structure...

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Abstract

The invention relates to a concrete autolysis chemical sulfate corrosion resistance system in a water environment. The system comprises a concrete base and porous silicon dioxide microspheres arranged in the concrete base, wherein a sulfate-corrosion-resistant repair agent is carried on the porous silicon dioxide microspheres, and an autolysis protective film is coated on the surface. Compared with the prior art, the sulfate corrosion resistance system can be effective for a long time, can enhance the sulfate corrosion resistance of the concrete structure within a wide range, establishes an intelligent sulfate-corrosion-resistant substructure concrete system, enhances the safety and durability of the substructure, and prolongs the service life of the substructure.

Description

technical field [0001] The invention relates to the field of concrete engineering, in particular to a concrete self-dissolving chemical sulfate corrosion resistance system in a water environment. Background technique [0002] Concrete sulphate attack is a kind of erosive medium damage that is more harmful, and it is also one of the important factors affecting the durability of concrete. At the same time, it is also the most complicated and harmful environmental water erosion. In coastal and inland saline lake areas, especially in areas with acidic groundwater and soil with high drilling soil, most of them contain sulfates, and the concrete components themselves may also contain sulfates, which will corrode concrete under various conditions The effect of concrete will cause expansion, cracking, spalling and other phenomena, and the loss of strength and viscosity, and even damage it. In recent years, the problem of sulfate corrosion of concrete structures has been found in ro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B20/12
CPCC04B20/12C04B28/00C04B2111/2015C04B20/107C04B20/1037C04B14/04
Inventor 蒋正武朱旭晶赵楠李文婷闫治国朱合华
Owner TONGJI UNIV
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