Concrete chemical-selfreparing microcapsule and preparation method thereof

Abstract

The invention discloses a concrete chemical-selfreparing microcapsule and a preparation method thereof. The concrete chemical-selfreparing microcapsule comprises a capsule core and a coating, the capsule core comprises a water soluble alkali and a forming agent, the coating comprises an organic material sensitive to low alkali environment, the water soluble alkali is one or a plurality of substances from calcium hydroxide, sodium hydroxide and potassium hydroxide. The concrete chemical-selfreparing microcapsule has good stability, by changing of the mass ratio of the capsule core material and the coating material, the release rate of the corrosion inhibitor can be controllably optimized, the water soluble alkali is used for enhancing PH to achieve the purposes of steel bar corrosion inhibition and delaying of the concrete carbonation, and the used materials are green and environmentally friendly, so that the concrete chemical-selfreparing microcapsule has the effects of controllable optimization, long effective period, good sustained-release effect and green and environmental protection effect.

Description

[technical field] [0001] The invention relates to a concrete corrosion inhibitor capsule, in particular to a concrete chemical self-repairing microcapsule and a preparation method thereof. [Background technique] [0002] As a representative of traditional building materials, reinforced concrete has the characteristics of high compressive strength, high durability, and low cost. It is widely used in industrial and civil buildings, bridges, road engineering, underground engineering, water conservancy and hydropower engineering, ports and marine engineering, etc. Structures are now infiltrating into long-span structures, towering structures, giant structures and special structures, and are the most widely used building materials. In the in-service concrete structure, with long-term use and the influence of the surrounding complex environment, especially in the coastal environment, the steel bars embedded in the concrete will inevitably corrode, resulting in a significant reduct...

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Problems solved by technology

[0004] Some scholars proposed to add corrosion inhibitors during the preparation of reinforced concrete, among which nitrite is a typical representative, but using this method, the large loss of corrosion inhibitors in the early stage makes its effect on steel corrosion inhibition very small

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