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Concrete anti-freezing agent and preparation method and application thereof

A technology of antifreeze and concrete, applied in the field of cement admixture, can solve the problems of low cement hydration rate, slow setting and hardening, low early strength, etc., and achieve the effects of reducing damage, accelerating cement hydration, and improving early strength

Inactive Publication Date: 2020-06-26
中建西部建设西南有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a concrete antifreeze agent for low cement hydration rate, slow setting and hardening, and low early strength in concrete under low temperature conditions.

Method used

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  • Concrete anti-freezing agent and preparation method and application thereof
  • Concrete anti-freezing agent and preparation method and application thereof
  • Concrete anti-freezing agent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The preparation process of the concrete antifreeze in this embodiment is as follows:

[0024] 20 parts lignin, 5 parts H 2 O 2 , 5 parts of formaldehyde and 70 parts of water are put into the reaction kettle, raise the temperature of the reaction kettle to 75℃, stir evenly for 2h, then add NaOH solution to adjust the pH to 9, and slowly add 5 parts of Na 2 SO 3 , Stir uniformly and react for 4 hours to obtain the lignin sulfomethylation product, which is cooled to room temperature for later use;

[0025] 2. Weigh 20% of the above-mentioned lignin sulfomethylation product in mass percentage, glycerol 5%, triethanolamine 3%, calcium formate 2%, sodium citrate 1%, sodium dodecylbenzene sulfonate 0.2% , The balance is water, mix, continue to stir at room temperature for 2h until all of it melts, you can get concrete antifreeze.

Embodiment 2

[0027] The preparation process of the concrete antifreeze in this embodiment is as follows:

[0028] 20 parts lignin, 5 parts H 2 O 2 , 5 parts of formaldehyde and 65 parts of water are put into the reaction kettle, raise the temperature of the reaction kettle to 80℃, stir evenly for 2h, then add NaOH solution to adjust the pH to 10, slowly add 5 parts of Na 2 SO 3 , Stir uniformly and react for 4 hours to obtain the lignin sulfomethylation product, which is cooled to room temperature for later use;

[0029] Weigh 20% of the above-mentioned lignin sulfomethylation product by mass percentage, glycerol 7%, triethanolamine 4%, calcium formate 3%, sodium citrate 1%, sodium dodecylbenzene sulfonate 0.2%, and the rest The amount is water, mix, continue to stir at room temperature for 2 hours until all of it melts, you can get the concrete antifreeze.

Embodiment 3

[0031] The preparation process of the concrete antifreeze in this embodiment is as follows:

[0032] 30 parts of lignin, 7 parts of H 2 O 2 , 8 parts of formaldehyde and 60 parts of water are put into the reaction kettle, raise the temperature of the reaction kettle to 90℃, stir evenly for 2.5h, then add NaOH solution to adjust the pH to 11, slowly add 7 parts of Na 2 SO 3 , Stir uniformly and react for 5 hours to obtain the lignin sulfomethylation product, which is cooled to room temperature for later use;

[0033] Weigh 25% of the above-mentioned lignin sulfomethylation product by mass percentage, glycerol 6%, ethylene glycol 4%, triethanolamine 3%, sodium acetate 2%, sodium citrate 2%, dodecyl sulfonic acid Sodium is 0.3%, the balance is water, and the mixture is mixed. Stirring is continued at room temperature for 3 hours until all of it is melted to obtain concrete antifreeze.

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Abstract

The invention provides a concrete anti-freezing agent, and belongs to the technical field of concrete admixtures. The anti-freezing agent comprises the following components, by mass: 20-30% of modified lignin, 5-10% of polyhydric alcohol, 3-5% of triethanolamine, 2-4% of an early strength agent, 0.2-0.4% of an air entraining agent and the balance of water. The preparation method of the modified lignin comprises the following steps: making a reaction on lignin, H2O2, formaldehyde and water at a temperature of 70-90 DEG C for 2-3 hours; regulating the pH value of the solution to 9-11;, slowly adding Na2SO3; and continuing to react for 4-6 hours to obtain a lignosulfonate methylation product. The invention further provides a preparation method and application of the anti-freezing agent. Theconcrete anti-freezing agent has the advantages that the freezing point of an aqueous solution is reduced, cement hydration is accelerated, hydration heat release is promoted, the system temperature is properly increased, concrete is normally set and hardened, the early strength of the concrete can be improved; meanwhile, the internal pore structure of the concrete is optimized, the internal frostheaving effect of the concrete is reduced, and thus the anti-freezing performance of the concrete is enhanced through the synergistic effect.

Description

Technical field [0001] The invention belongs to the technical field of cement admixtures, and specifically relates to a concrete antifreeze and a preparation method and application thereof. Background technique [0002] my country has a vast land area, and the climatic conditions vary greatly from region to region. The climate difference between the north and the south is particularly significant. In winter, most parts of the north have a long period of severe cold, and the temperature is usually below 0°C. With the rapid development of the construction industry, concrete construction in winter has gradually become commonplace; however, the rate of cement hydration of concrete decreases significantly in low temperature environments, and the concrete cannot be set and hardened normally, and its early strength is greatly affected; at the same time, concrete under negative temperature conditions The icing of the middle moisture produces frost heave, which causes concrete damage when...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/20C04B103/60
CPCC04B40/0039C04B2103/601C04B18/26C04B24/02C04B24/122C04B24/20C04B24/06C04B24/04
Inventor 袁文韬张远兰聪王军刘东刘霞张武宗
Owner 中建西部建设西南有限公司
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