Concrete anti-corrosion admixture

Abstract

The invention discloses a concrete anti-corrosion admixture which is prepared by mixing the following raw materials in part by weight: 15 to 30 parts of poly carboxylic acid water reducing agent, 10 to 15 parts of organic amine, 0.1 to 0.15 part of triterpenoid saponins, 0.1 to 0.5 part of migration prevention agent, 2 to 3 parts of organic alkylol amine and 50 to 70 parts of water. The anti-corrosion admixture has no nitrite in the components, has no pollution to the environment and has chloridion content of lower than 0.07 percent. Due to the low chloridion content, the probability of concrete corrosion is reduced. The alkali content of the concrete anti-corrosion admixture is lower than 1.0 percent by weight, so that an alkali aggregate reaction is avoided, adverse effect of post cracking and the like of concrete are reduced, the service life of the concrete is prolonged and the durability is improved. The concrete anti-corrosion admixture is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a concrete rust inhibitor, which belongs to the field of building material science. Background technique [0002] Reinforced concrete structure combines the advantages of steel and concrete, and the cost is low, so it has a wide range of applications in superstructure projects. However, due to the corrosion of steel bars, the durability and safety of buildings are greatly reduced, and the damage of reinforced concrete structures has become a worldwide problem. [0003] In reinforced concrete structures, steel corrosion is one of the main causes of premature failure of reinforced concrete structures. The main cause of corrosion of steel bars is chlorine salt. On the one hand, chlorine salt comes from concrete raw materials, such as mixing water, sea sand, anti-icing salt, salt spray, and chlorine salt (or chloride salt) admixture; on the other hand, it comes from the use environment , Chloride ions can penetrate the concrete t...

AI Technical Summary

Problems solved by technology

The main cause of corrosion of steel bars is chlorine salt. On the one hand, chlorine salt comes from concrete raw materials, such as mixing water, sea sand, anti-icing salt, salt spray, and chlorine salt (or chloride salt) admixture; on the other hand, it comes from the use environment , Chloride ions can penetrate the concrete to reach the surface of the steel bar and destroy the passivation film on the surface of the steel bar. Iron hydrate, with a large volume expansion, generates expansion stress inside the concrete, leading to cracking of the concrete, damage to the bond between the steel bar and the concrete, reduction of the stressed section of the reinforced concrete structure, and reduction of the structural strength, etc., resulting in a reduction in the durability of the structure

As a result, the strength and service life of the concrete are greatly reduced, and eventually the entire building collapses and is scrapped.

[0004] In order to prevent the corrosion of steel bars and prolong the service life of buildings, people began to study steel bar rust inhibitors in the 1980s, mainly nitrite and dichromate and other substances, which have good anti-rust performance, but have relatively low corrosion resistance. Strong toxicity or carcinogenicity, harmful to human body and polluting the environment

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