a concrete retarder

Abstract

The invention discloses concrete retarder. The concrete retarder comprises, by weight, 2-4 parts of sodium borate, 3-7 parts of monopotassium phosphate, 4-8 parts of calcium sulfate, 6-8 parts of etidronic acid, 3-5 parts of ethylene diamine tetraacetic acid, 1-4 parts of sorbitol, 25-30 parts of bentonite, 10-15 parts of vermiculite powder, 4-6 parts of a water reducing agent, 1-3 parts of a dispersing agent and 0.4-0,8 part of a surface active agent. The concrete retarder has the advantages of good retarding effect, high strength, free of pollution and the like, and is a concrete additive which is quite promising.

Description

technical field [0001] The invention relates to a concrete retarder, which belongs to the technical field of concrete admixtures. Background technique [0002] Concrete admixture is a commonly used reagent in the concrete preparation process. It not only has a small dosage, but also can improve the performance of concrete to meet actual needs. At the same time, it can also save cement, reduce energy consumption and reduce pollutant emissions. Common admixtures are: early strength agent, water reducing agent, air-entraining agent, retarder, etc. Among them, retarder is a kind of heat release rate that can delay and reduce cement hydration, thereby prolonging the time for concrete to fully set, making fresh concrete maintain plasticity for a long time, convenient for pouring, and improving construction efficiency. An admixture that does not adversely affect the performance of the item. Therefore, retarders play an important role in the field of concrete. [0003] At present...

AI Technical Summary

Problems solved by technology

Although it can obtain a strong retarding effect, it is still unsatisfactory in terms of concrete application, especially in terms of concrete strength.

In addition, the use of nitrate is prone to produce NO 2 Pollutants such as air pollution

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