Liquid alkali-free accelerator and room-temperature synthesis process thereof

Abstract

The invention discloses a liquid alkali-free accelerator and a room-temperature synthesis process thereof. The accelerator includes, by weight, 48 to 50 parts of aluminum sulfate, 4.5 to 5.5 parts ofmagnesium fluosilicate, 1.5 to 2.5 parts of ferrous sulfate, 3.5 to 5.5 parts of urea, 2 to 3 parts of organosilicon sol, 4.5 to 5.5 parts of glycerol, 1 to 2 parts of AMP-95 (amine neutralizer) and 24.5 to 35.5 parts of water. The problem that a solution is too thick is solved by reducing the proportion of the aluminum sulfate and the magnesium fluosilicate in the whole system. The pH value of the accelerator is adjusted by using the AMP-95 (amine neutralizer), so that the pH value of the accelerator can be effectively increased while the setting time of the accelerator is not influenced, andalkali metal ions are not introduced. The use of the glycerol can effectively shorten the final setting time, so that the final setting time is closer to the initial setting time. Moreover, no inorganic acid is introduced in the accelerator, so that the corrosion of the accelerator to spraying equipment is very small. The accelerator has the advantages of low corrosivity, low cost, small consistency, good comprehensive performance and the like.

Description

Technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a liquid alkali-free accelerator and its normal temperature synthesis process. Background technique [0002] Alkali-free quick-setting admixture is an admixture used to improve the performance of concrete. Taking several currently disclosed formulas and preparation methods as examples, the patent is titled "A highly adaptable liquid alkali-free quick-setting admixture and its preparation at room temperature Method", the patent application number is 201910090482.7, because the temperature of the solution is increased instantaneously by using inorganic acid and aluminum hydroxide to react, so a large amount of inorganic acid will be introduced, so that the amount of inorganic acid in the system is too much and the pH is too low , The prepared alkali-free quick-setting admixture is more corrosive and will cause greater harm to spray equipment; [0003] In the patent name "A li...

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Problems solved by technology

[0002] Alkali-free accelerator is an admixture used to improve the performance of concrete. Taking several formulas and preparation methods disclosed at present as examples, the patent titled "A Highly Adaptable Liquid Alkali-Free Accelerator and Its Preparation at Normal Temperature Method", the patent application number is 201910090482.7, because the temperature of the solution is raised instantaneously by using the reaction of inorganic acid and aluminum hydroxide, so a large amount of inorganic acid will be introduced, so that the amount of inorganic acid in the system is too much and the pH is too low , the prepared alkali-free accelerator is highly corrosive and will cause great harm to the injection equipment;

[0003] In the patent name "A Liquid Alkali-free Accelerator and Its Preparation Method", the patent application number is 201810174062.2, because the use of sodium metaaluminate to neutralize the pH value of the solution effectively reduces the corrosion of the alkali-free accelerator. However, due to the use of more defoamers, triethanolamine and ethylenediaminetetraacetic acid, the cost of the prepared alkali-free quick-setting agent will be high;

[0004] In the patent titled "An Environmentally Friendly Alkali-Free Accelerator and Its Preparation Method", the patent application number is 201710579702.3. In the proportion of each raw material, the proportion of aluminum sulfate and fluorosilicate is too large, which will lead to The consistency of the prepared alkali-free accelerator is too large, especially after entering winter, it will affect the workability of the solution if it is too thick, and the injection equipment with low power may even fail to pump the accelerator

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