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A liquid alkali-free quick-setting agent widely suitable for various types of cement

A technology of accelerator and cement, which is applied in the field of engineering construction, can solve the problems of poor adaptability of alkali-free accelerator to cement, achieve good storage stability, good construction environment, and improve applicability

Active Publication Date: 2021-01-15
RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the above-mentioned non-alkali quick-setting agent has poor adaptability to cement, one of the purposes of the present invention is to provide a liquid non-alkali quick-setting agent that is widely applicable to various types of cement and has wide adaptability to various cements. , can be more widely used in various projects, and improve the ratio of the 1-day compressive strength of shotcrete to the 28-day compressive strength

Method used

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  • A liquid alkali-free quick-setting agent widely suitable for various types of cement
  • A liquid alkali-free quick-setting agent widely suitable for various types of cement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In a 250mL three-neck flask equipped with an electric stirrer and a thermometer, add 40g of amorphous aluminum hydroxide and 90g of hydrofluoric acid with a concentration of 40%, and stir until the solution is transparent to obtain an aluminum fluoride solution, which is discharged for later use.

[0038] In a 1000ml three-necked flask equipped with an electric stirrer and a thermometer, add 380g of deionized water, 400g of polyaluminum sulfate, 10g of magnesium fluorosilicate, 30g of triethanolamine, 45g of magnesium sulfate, 0.5g of phosphoric acid, 1g of ammonium monohydrogen phosphate, 1g of silicone defoamer, stir and heat to 80°C, keep warm for 2-3h, until it is completely dissolved and becomes a transparent solution, cool to below 40°C, add aluminum fluoride solution and stir evenly to obtain a liquid alkali-free accelerator.

[0039] The liquid alkali-free accelerator has a pH value of 1-4 and an alkali equivalent of ≤1%. The appearance is a transparent liquid, ...

Embodiment 2

[0041] In a 250ml three-necked flask equipped with an electric stirrer and a thermometer, add 40g of amorphous aluminum hydroxide and 90g of hydrofluoric acid with a concentration of 40%, and stir until the solution is transparent to obtain an aluminum fluoride solution, which is discharged for later use.

[0042] Add 380g of deionized water, 400g of polyaluminum sulfate, 30g of ferric sulfate, 5g of magnesium fluorosilicate, 5g of zinc fluorosilicate, 20g of triethanolamine, and 10g of triisopropyl in a 1000ml three-necked flask equipped with an electric stirrer and a thermometer. Alcohol amine, 20g urea, 2g lactic acid, 1g ammonium monohydrogen phosphate, 1g polyether defoamer, stir and heat to 80°C, keep warm for 2-3h, make it completely dissolved and become a transparent solution, cool to below 40°C, add fluorine The aluminum solution is stirred evenly to obtain a liquid alkali-free accelerator.

[0043] The liquid alkali-free accelerator has a pH value of 1-4 and an alkal...

Embodiment 3

[0045] In a 250ml three-neck flask equipped with an electric stirrer and a thermometer, add 50g of amorphous aluminum hydroxide and 110g of hydrofluoric acid with a concentration of 40%, stir until the solution is transparent to obtain an aluminum fluoride solution, and discharge it for later use.

[0046]Add 380g of deionized water, 400g of polyaluminum sulfate, 30g of ferric sulfate, 10g of magnesium fluorosilicate, 30g of triethanolamine, 45g of magnesium sulfate, 0.5g of phosphoric acid, and 1g of phosphoric acid in a 1000ml three-necked flask equipped with an electric stirrer and a thermometer. Ammonium monohydrogen, 1g organic silicon defoamer, stir and heat to 80°C, keep warm for 2-3h, make it completely dissolved and become a transparent solution, cool to below 40°C, add aluminum fluoride solution and stir evenly to obtain a liquid alkali-free coagulant.

[0047] The liquid alkali-free accelerator has a pH value of 1-4 and an alkali equivalent of ≤1%. The appearance i...

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Abstract

The invention provides a liquid alkali-free setting accelerator widely applicable to various types of cement, wherein the liquid alkali-free setting accelerator includes 35-60 parts by weight of water, 40-50 parts by weight of polyaluminum sulfate or aluminum sulfate, 0-5 parts by weight of iron sulfate, 0-3 parts by weight of a complexing agent, 2-5 parts by weight of organic amine, 2-5 parts byweight of an early strength agent, 0-2 parts by weight of a pH regulator, 0.5-1 part by weight of a slag activator, 0.1-0.3 part by weight of a defoamer, and 2-8 part by weight of aluminum fluoride. The invention also provides a preparation and application of the liquid alkali-free setting accelerator. The liquid alkali-free setting accelerator provided by the invention is especially suitable forshotcrete, has wide adaptability to various kinds of cement, can improve the applicability of the alkali-free setting accelerator to cement, improves the strength of the shotcrete, and is more widelyapplied in various projects.

Description

technical field [0001] The invention belongs to the field of engineering construction, and in particular relates to a coagulant used in concrete construction. Background technique [0002] Accelerator is a chemical admixture that can make cement paste, mortar or concrete set and harden quickly without unduly affecting its long-term strength. Since the accelerator started to be produced and used, it has become one of the important components of shotcrete due to its remarkable characteristics in quick-setting and early strength. The type and quality of accelerators directly affect the quality of shotcrete. Therefore, the research on shotcrete at home and abroad puts accelerators in a very important position. [0003] At present, alkaline liquid quick-setting agents are mostly used in our country, which are usually made of sodium aluminate or sodium silicate as the main component, and then mixed with alcohol amine, tackifier and other components dissolved in water. Its effect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/12C04B103/12
CPCC04B40/0039C04B2103/12C04B22/148C04B22/142C04B22/149C04B24/121C04B2103/14C04B2103/50C04B22/126C04B2103/0094
Inventor 马伟斌马超锋马荣田倪光斌林传年郭小雄王志伟付兵先安哲立赵鹏柴金飞许学良
Owner RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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