Concrete corrosion inhibitor

Abstract

The invention discloses a concrete corrosion inhibitor, and belongs to the field of building materials. The concrete corrosion inhibitor is prepared from the following components in percentage by mass: 30 to 45 percent of a nitrite, 30 to 45 percent of benzotriazole, 3 to 5 percent of tetrakis hydroxymethyl phosphonium sulfate, 5 to 10 percent of polycarboxylate superplasticizer, 0.02 to 0.05 percent of an air entraining agent, 2 to 6 percent of pentasodium phosphate and the balance of sodium monofluorophosphate. The preparation method of the concrete corrosion inhibitor comprises the following steps: mixing sodium nitrite, benzotriazole and water, heating to 25-35 DEG C, adding the air entraining agent and pentasodium phosphate, uniformly stirring, keeping the temperature for 1-3 hours, cooling to room temperature, adding tetrakis (hydroxymethyl) phosphonium sulfate, the polycarboxylate superplasticizer and sodium monofluorophosphate, stirring, dissolving, and standing a solution for15-40 minutes to obtain the concrete corrosion inhibitor. The concrete corrosion inhibitor prepared by the invention can effectively improve the workability of concrete, slow down slump loss and enhance the corrosion inhibition performance, has long corrosion inhibition duration, and is suitable for coastal ports, salt pans and salinized soil areas.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a concrete rust inhibitor. Background technique [0002] Coastal ports, salt pans and saline soil areas usually contain a large amount of sulfate and chloride salts, which have a serious corrosion effect on concrete and steel bars, causing serious damage to reinforced concrete structures in this area, and the expected life of the structure cannot be reached. Therefore, the durability of reinforced concrete structures in the above-mentioned erosion areas has become a worldwide concern. [0003] Existing traditional methods use sulfate-resistant cement, or mix a certain amount of mineral admixtures in concrete. Sulfate-resistant cement, however, is in limited supply and expensive. More importantly, sulfate-resistant cement has poor ability to prevent corrosion of steel bars caused by chloride salts, which seriously affects the durability of reinforced concrete structures in erod...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a concrete rust inhibitor to solve the technical problems that the rust inhibitor has poor workability to concrete and the slump loss of concrete is fast after the rust inhibitor is added in the prior art.