Chlorine-free and alkali-free liquid setting accelerator and preparation method thereof

Abstract

The invention belongs to the technical field of preparation of additives, and in particular relates to a chlorine-free and alkali-free liquid setting accelerator and a preparation method thereof. The preparation method comprises the steps of adding aluminum sulfate and aluminum hydroxide into deionized water, and heating to obtain mother liquor of aluminate; then, adding magnesium fluosilicate and disodium ethylenediamine tetraacetate into the deionized water, and heating to obtain a magnesium fluosilicate solution; mixing the magnesium fluosilicate solution with the mother liquor of aluminate, then adding organic amine, organic acid and a stabilizer, and stirring to obtain the chlorine-free and alkali-free liquid setting accelerator. The setting accelerator prepared by the method has the characteristics of being small in mixing amount and good in setting acceleration effect; furthermore, after the setting accelerator is used, the mechanical properties of the concrete are improved, and the compressive strength of the concrete is increased; therefore, the chlorine-free and alkali-free liquid setting accelerator is an ideal concrete additive.

Description

technical field

[0001] The invention belongs to the technical field of preparation of admixtures, and in particular relates to a chlorine-free and alkali-free liquid quick-setting agent and a preparation method thereof. Background technique

[0002] Accelerators are often added to concrete during rapid construction, geotechnical engineering and underground tunnel construction. The purpose of adding quick-setting agent is to accelerate the setting speed of concrete, accelerate the strength development process of concrete and reduce the risk of peeling off the base layer due to the self-weight of the newly constructed concrete in the plastic stage, so as to realize the façade, roof, vault, etc. Rapid, large-thickness construction of structures.

[0003] Traditional concrete accelerators can be divided into two types: alkaline powder and alkaline liquid accelerators. From the point of view of use, there are mainly the following problems: ① High alkali content, on the one hand...

Examples

example 1

[0021] Add 30g of aluminum sulfate and 10g of aluminum hydroxide into 15mL of deionized water, heat to 80°C, stir and react at 300r / min for 1h to obtain aluminate mother liquor, then take 4g of magnesium fluorosilicate and 2g of disodium edetate , add 10mL deionized water, heat to 50°C, stir at 300r / min until the solid is completely dissolved to obtain a magnesium fluorosilicate solution, and then add the magnesium fluorosilicate solution dropwise to the aluminate mother liquor at 1mL / min to obtain Stir at 300r / min until the addition is complete, keep the temperature at 60°C, then add 1g diethanolamine and 1g citric acid, continue stirring at 60°C for 30min, add 0.5g phosphoric acid after cooling to room temperature, and stir at 200r / min for 10min, Chlorine-free and alkali-free liquid quick-setting agent.

example 2

[0023] Add 35g of aluminum sulfate and 13g of aluminum hydroxide into 23mL of deionized water, heat to 85°C, stir and react at 350r / min for 1h to obtain aluminate mother liquor, then take 5g of magnesium fluorosilicate and 4g of disodium edetate , add 15mL deionized water, heat to 55°C, stir at 350r / min until the solid is completely dissolved to obtain a magnesium fluorosilicate solution, and then add the magnesium fluorosilicate solution dropwise to the aluminate mother liquor at 1mL / min to obtain Stir at 350r / min until the dropwise addition is complete, keep the temperature at 70°C, add 3g of triethanolamine, 2g of tartaric acid, continue stirring at 70°C for 35min, add 1.3g of phosphoric acid after cooling to room temperature, and stir at 250r / min for 15min to obtain Chlorine-free and alkali-free liquid accelerator.

example 3

[0025] Add 40g of aluminum sulfate and 15g of aluminum hydroxide into 30mL of deionized water, heat to 90°C, stir and react at 400r / min for 2h to obtain aluminate mother liquor, then take 6g of magnesium fluorosilicate and 5g of disodium edetate , add 20mL deionized water, heat to 60°C, and stir at 400r / min until the solid is completely dissolved to obtain a magnesium fluorosilicate solution, and then add the magnesium fluorosilicate solution dropwise to the aluminate mother liquor at 2mL / min to obtain Stir at 400r / min until the dropwise addition is complete, keep the temperature at 80°C, then add 4g propanolamine and 3g lactic acid, continue stirring at 80°C for 40min, add 2.0g phosphoric acid after cooling to room temperature, and stir at 300r / min for 20min, Chlorine-free and alkali-free liquid quick-setting agent.

technical field

[0001] The invention belongs to the technical field of preparation of admixtures, and in particular relates to a chlorine-free and alkali-free liquid quick-setting agent and a preparation method thereof. Background technique

[0002] Accelerators are often added to concrete during rapid construction, geotechnical engineering and underground tunnel construction. The purpose of adding quick-setting agent is to accelerate the setting speed of concrete, accelerate the strength development process of concrete and reduce the risk of peeling off the base layer due to the self-weight of the newly constructed concrete in the plastic stage, so as to realize the façade, roof, vault, etc. Rapid, large-thickness construction of structures.

[0003] Traditional concrete accelerators can be divided into two types: alkaline powder and alkaline liquid accelerators. From the point of view of use, there are mainly the following problems: ① High alkali content, on the one hand...

Examples

example 1

[0021] Add 30g of aluminum sulfate and 10g of aluminum hydroxide into 15mL of deionized water, heat to 80°C, stir and react at 300r / min for 1h to obtain aluminate mother liquor, then take 4g of magnesium fluorosilicate and 2g of disodium edetate , add 10mL deionized water, heat to 50°C, stir at 300r / min until the solid is completely dissolved to obtain a magnesium fluorosilicate solution, and then add the magnesium fluorosilicate solution dropwise to the aluminate mother liquor at 1mL / min to obtain Stir at 300r / min until the addition is complete, keep the temperature at 60°C, then add 1g diethanolamine and 1g citric acid, continue stirring at 60°C for 30min, add 0.5g phosphoric acid after cooling to room temperature, and stir at 200r / min for 10min, Chlorine-free and alkali-free liquid quick-setting agent.

example 2

[0023] Add 35g of aluminum sulfate and 13g of aluminum hydroxide into 23mL of deionized water, heat to 85°C, stir and react at 350r / min for 1h to obtain aluminate mother liquor, then take 5g of magnesium fluorosilicate and 4g of disodium edetate , add 15mL deionized water, heat to 55°C, stir at 350r / min until the solid is completely dissolved to obtain a magnesium fluorosilicate solution, and then add the magnesium fluorosilicate solution dropwise to the aluminate mother liquor at 1mL / min to obtain Stir at 350r / min until the dropwise addition is complete, keep the temperature at 70°C, add 3g of triethanolamine, 2g of tartaric acid, continue stirring at 70°C for 35min, add 1.3g of phosphoric acid after cooling to room temperature, and stir at 250r / min for 15min to obtain Chlorine-free and alkali-free liquid accelerator.

example 3

[0025] Add 40g of aluminum sulfate and 15g of aluminum hydroxide into 30mL of deionized water, heat to 90°C, stir and react at 400r / min for 2h to obtain aluminate mother liquor, then take 6g of magnesium fluorosilicate and 5g of disodium edetate , add 20mL deionized water, heat to 60°C, and stir at 400r / min until the solid is completely dissolved to obtain a magnesium fluorosilicate solution, and then add the magnesium fluorosilicate solution dropwise to the aluminate mother liquor at 2mL / min to obtain Stir at 400r / min until the dropwise addition is complete, keep the temperature at 80°C, then add 4g propanolamine and 3g lactic acid, continue stirring at 80°C for 40min, add 2.0g phosphoric acid after cooling to room temperature, and stir at 300r / min for 20min, Chlorine-free and alkali-free liquid quick-setting agent.

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