Anti-erosion agent for concrete, preparation method and application thereof

Abstract

The invention relates to an anti-erosion agent for concrete, a preparation method and an application thereof. The anti-erosion agent comprises the following components in parts by weight: 100 parts of original-state superfine fly ash microsphere, 5-9 parts of water reducer, 30-80 parts of expanding agent, 0.075-0.3 part of air entraining agent, 25-75 parts of bulking agent and 0.37-1.25 parts of retarder. Compared with the prior art, the product of the invention utilizes the original-state superfine fly ash microspheres and has excellent performance, the production process is simple, the application is convenient, the applicability is universal, and the application effect is extremely standout. As for the concrete prepared by adopting the product of the invention, the anti-sulphate-erosion ability thereof can be improved by 5-8 times, the anti-chloridion-penetrating ability can be improved by more than 3 times, and the service life of the concrete structure can be prolonged by 3-4 times under the condition that the service environment of the concrete structure is not changed.

Description

Technical field [0001] The invention relates to building materials, in particular to a concrete anti-corrosion agent and its preparation method and application. Background technique [0002] The chemical attack of concrete includes acid, alkali, salt attack, carbonization and alkali-aggregate reaction. After the concrete is subjected to chemical attack, its mechanical properties are greatly reduced, and it is more likely to cause expansion and cracking, structural looseness, steel bar corrosion and other phenomena, resulting in the entire reinforced concrete structure Crash and structural failure, which not only affects the safety of concrete structures, but also causes great economic losses and waste of resources. For a long time, people have adopted various measures to solve the anti-corrosion problem of concrete, such as increasing the amount of cement, improving the gradation of aggregates, adding water-reducing agents, etc., but the results are limited and the cost increases...

AI Technical Summary

Problems solved by technology

[0002] The chemical corrosion of concrete includes acid, alkali, salt corrosion, carbonation and alkali-aggregate reaction, etc. After the concrete is subjected to chemical corrosion, its mechanical properties are greatly reduced, and it is more likely to cause expansion cracking, structural looseness, steel corrosion and other phenomena, resulting in the entire reinforced concrete structure. collapse and structural failure, which not only affects the safety of concrete structures, but also causes great economic losses and waste of resources

For a long time, people have adopted various measures to solve the anti-corrosion problem of concrete, such as increasing the amount of cement, improving the aggregate gradation, adding water reducing agents, etc., but the results are limited and the cost has increased a lot

[0003] In the past few years, people have also used a large amount of fly ash and slag powder to make up for some defects in concrete. However, due to the common problems of low early strength and easy cracking in large-volume fly ash and slag powder concrete, they are not widely used in engineering applications. encountered great resistance, and it is still difficult to have high-quality fly ash and slag powder resources in some areas of our country

[0004] After the concrete expansion agent was successfully developed, people began to generally adopt the measures of single-mixing expansion agent or compound addition of expansion agent and water reducing agent to improve the impermeability and compactness of concrete. , such measures are not very practical