Preparation method of high-strength concrete accelerator

Abstract

The invention discloses a preparation method of a high-strength concrete accelerator, which relates to a preparation method of a concrete admixture, in particular to the preparation method of the high-strength concrete accelerator. The method comprises the following steps of taking aluminum sulfate as a base stock of an alkali-free accelerator, and on the basis, adding adjuvants such as sodium fluoride, sodium silicate, xylene, naphthalenesulfonic acid-formaldehyde condensate, triethanolamine, calcium formate, hydroxyethyl carboxymethyl cellulose so as to play a part in increasing concrete strength, accelerating reaction rate and the like. When reaction is performed to a certain extent, phosphoric acid and methacrylic acid are added finally, an added acid solution plays a certain assistantpart to effectively adjust the pH value of a reaction system, so that a final product can effectively play a part in quick setting while not corroding steel materials in a concrete system to influence the strength of concrete in later stage. The preparation method is simple and good in effect.

Description

technical field [0001] The invention relates to a preparation method of a concrete admixture, in particular to a preparation method of a high-strength concrete quick-setting agent. Background technique [0002] The use of accelerators can effectively reduce the setting time of cement, thereby reducing the construction period and speeding up the progress of the project. Since the first invention of accelerators in the 1930s, the development and application of accelerators have been rapid. However, the development of accelerators in China is relatively slow. The accelerators in my country are mainly represented by "Red Star-I" and "Type 728". Coagulant-based. [0003] Chinese Invention Patent No. CN1407954A discloses the preparation of a quick-setting agent, which dissolves aluminum sulfate in water to generate aluminum hydroxide and then adds it to amine-containing water, and prepares the quick-setting agent with carboxylic acid, phosphoric acid and salt as stabilizers . A...

AI Technical Summary

Problems solved by technology

Although this quick-setting agent has a short quick-setting time, it can make the concrete have good strength and can resist temperature changes, but in the actual production and preparation process, aluminum hydroxide is formed in the middle, and the formation of alkaline substances in the system It will cause the PH value of the system to be difficult to control, so that the final effect of the product cannot be guaranteed

[0004] The patent CN201110112424 of China Building Materials Research Institute discloses a non-alkali liquid quick-setting agent prepared with aluminum sulfate as the base material and organic amines as the viscosity modifier. This quick-setting agent can effectively reduce the setting time of concrete and also It can increase the thickness of the sprayed layer, but through actual testing, it is found that the concrete using this accelerator will cause serious strength loss in the later period of use

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