Alkali-free liquid accelerator and preparation method thereof

Abstract

The invention discloses an alkali-free liquid accelerator and a preparation method thereof. The alkali-free liquid accelerator is prepared from, by weight, 45%-55% of aluminum sulfate, 1%-5% of aluminum hydroxide, 1%-5% of phosphoric acid, 1%-3% of diethanol amine, 1%-3% of glycollic acid, 0.5%-2% of sepiolite mineral powder, 0.5%-2% of bisphenol condensation compound and the balance deionized water. The preparation method of the alkali-free liquid accelerator comprises the steps that the aluminum hydroxide and the aluminum sulfate are successively dissolved, the bisphenol condensation compound and the sepiolite mineral powder are added to complete viscosity improvement, and finally residual components are added to complete organic compounding. The bisphenol condensation compound and the sepiolite mineral powder are added into the alkali-free liquid accelerator, its tiny granules and thin and short fibers are evenly dispersed in the solution to form a crosslinking net-like structure, the crystallizing resistance of sulfate radicals and aluminum ions is greatly improved, water molecules and aluminum sulfate difficultly produce crystallization and sedimentation and good solubilizingand stabilizing effects are achieved. The concrete setting time is effectively shortened by the glycollic acid and the diethanol amine, and the early strength of concrete is improved.

Description

technical field [0001] The invention belongs to the technical field of concrete preparation, in particular to an alkali-free liquid quick-setting agent and a preparation method thereof. Background technique [0002] Alkali-free liquid accelerator is the latest generation product of accelerator development. Compared with traditional powder accelerator and alkali accelerator, alkali-free liquid accelerator almost completely eliminates the alkaline substances in it, avoiding It prevents the damage of concrete by alkali aggregate reaction, and has a high later strength retention rate; on the other hand, it contains almost no chloride ions, which eliminates the possibility of steel corrosion and improves the durability of reinforced concrete structures. [0003] However, there is also a technical bottleneck in the development of non-alkali liquid accelerators. Most non-alkali liquid accelerators are mainly composed of aluminum sulfate or polyaluminum sulfate systems. At room tem...

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Problems solved by technology

[0006] In order to solve the problem of poor stability of common alkali-free liquid accelerators and achieve good concrete quick-setting effects and early strength requirements, the invention provides an alkali-free liquid accelerator and its preparation method, specifically through the following techniques accomplish

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