Hydrated calcium aluminate nano crystal nucleus early strength agent and preparation method thereof

Abstract

The invention relates to a hydrated calcium aluminate nano crystal nucleus early strength agent and a preparation method thereof. The hydrated calcium aluminate nano crystal nucleus early strength agent is prepared from the following ingredients of tricalcium aluminate, dihydrate gypsum, a dispersion stabilizer and deionized water, wherein a molar ratio of the tricalcium aluminate to the dihydrategypsum is 1 to (1 to 3); the dispersion stabilizer is a mixed solution which is prepared by dissolving a polycarboxylate superplasticizer, triethanolamine and tri-isopropanolamine into water according to the mass ratio as (10 to 30) to 1 to (1 to 3), and the mass concentration of the mixed solution is 10%. The hydrated calcium aluminate nano crystal nucleus early strength agent disclosed by the invention can obviously improve early strength of cement mortar; the hydrated calcium aluminate nano crystal nucleus early strength agent is doped into ordinary Portland cement mortar according to thedoping amount as 1.0 to 2.0%, 1d strength can be improved by 85% or more; the hydrated calcium aluminate nano crystal nucleus early strength agent can be widely applied to concrete prefabricated parts, so that maintenance time with molds is shortened, the turnover rate of the molds is improved, and the production efficiency is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a calcium aluminate hydrate nano crystal nucleus early strength agent and a preparation method thereof. Background technique [0002] Concrete early strength agent is a kind of concrete admixture, it can promote the early hydration of cement, improve the early strength of concrete, early strength agent can be divided into organic type, inorganic type and compound type according to the composition. Traditional early strength agents are mostly inorganic, such as chloride salts, sulfates and nitrites. Their applications are not ideal, such as poor low temperature adaptability, reduced later strength, reduced impermeability and durability, etc.; and then developed Organic accelerators such as alcohol amines, calcium formate and compound accelerators also have many shortcomings. For example, alcohol amines are very sensitive to the dosage, which leads to the inability to a...

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Problems solved by technology

Traditional early strength agents are mostly inorganic, such as chloride salts, sulfates and nitrites. Their applications are not ideal, such as poor low temperature adaptability, reduced later strength, reduced impermeability and durability, etc.; and then developed Organic accelerators such as alcohol amines, calcium formate and compound accelerators also have many shortcomings. For example, alcohol amines are very sensitive to the dosage, which leads to the inability to accurately control the setting time and affect the early workability of concrete. The strengthening agent is compounded with a variety of early strength agents, which requires high control and operability of the mixing ratio. There may be interactions and influences between individual components or between components and other admixtures, and the expected effect cannot be achieved. Even make the admixture ineffective

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