Thickener for self-compacting concrete, preparation method thereof and self-compacting concrete using the thickener

A technology of self-compacting concrete and thickener, which is applied in the fields of concrete admixture, concrete structure and concrete engineering, can solve the problems of unable to obtain qualified products, complex emulsification system, difficult emulsification, etc. Good, good thickening effect

Active Publication Date: 2016-05-18
CCCC FOURTH HARBOR ENG INST +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in emulsion polymerization, the more types of monomers, the more complex the emulsification system and the more difficult the emulsification
Synthesizing in the laboratory may meet the requirements of the product, but in production, it is prone to poor emulsification, solution layering, and a large amount of gel, and it is impossible to obtain a qualified product

Method used

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  • Thickener for self-compacting concrete, preparation method thereof and self-compacting concrete using the thickener
  • Thickener for self-compacting concrete, preparation method thereof and self-compacting concrete using the thickener
  • Thickener for self-compacting concrete, preparation method thereof and self-compacting concrete using the thickener

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This example is a preparation example for self-compacting concrete thickener.

[0028] Weigh 5.0g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS) and 15.0g of acrylic acid (AA), neutralize with 35mL of 20% NaOH solution until the pH of the mixture is 7; add 2.0g while stirring g of acrylamide (AM) solution, so that the total monomer concentration is 20%, after stirring evenly, pour the prepared solution into a 250mL three-necked flask, put it in a constant temperature water bath, pass nitrogen protection, and set the stirring speed to 1100 rpm / min; when the reaction temperature rises to 40°C, add 0.05g ammonium persulfate (40% aqueous solution) and 0.05g sodium bisulfite mixture initiator drop by drop, keep warm, stir and react for 2 hours, when the reactant is viscous liquid When the nitrogen is stopped, the constant temperature is matured for about 2 hours to obtain a colorless transparent colloid, which is a thickener for self-compacting concrete.

[0029] See ...

Embodiment 2

[0032] This example is a preparation example for self-compacting concrete thickener.

[0033] Weigh 4.05g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS) and 9.75g of acrylic acid (AA), neutralize with 45mL of 20% NaOH solution until the pH of the mixture is 6.8; add 1.5g while stirring g of acrylamide (AM) solution, so that the total concentration of the three monomers is 20%, after stirring evenly, pour the prepared solution into a 250mL three-necked flask, put it in a constant temperature water bath, pass nitrogen protection, and set the stirring speed 1000 rpm; when the reaction temperature rises to 40°C, add 0.025g ammonium persulfate (40% aqueous solution) and 0.025g sodium bisulfite mixture initiator dropwise, keep warm, and stir for 2 hours. When it is a viscous liquid, stop nitrogen, and cure it at a constant temperature for about 2 hours to obtain a colorless and transparent colloid, which is a thickener for self-compacting concrete.

Embodiment 3

[0035] This example is a preparation example for self-compacting concrete thickener.

[0036] Weigh 7.5g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS) and 19.5g of acrylic acid (AA), neutralize with 60mL of 20% NaOH solution until the pH of the mixture is 6.7; add 3.0g of Acrylamide (AM) solution, so that the total monomer concentration is 20%. After stirring evenly, pour the prepared solution into a 250mL three-necked flask, put it in a constant temperature water bath, and protect it with nitrogen. Set the stirring speed to 1300 rpm When the reaction temperature rises to 40°C, add 0.075g ammonium persulfate (40% aqueous solution) and 0.075g sodium bisulfite mixture initiator drop by drop, keep warm, stir and react for 2 hours, when the reactant is viscous liquid Stop the nitrogen flow, and cure at constant temperature for a period of about 2 hours to obtain a colorless transparent colloid, which is a thickener for self-compacting concrete.

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Abstract

The invention discloses a preparation method of a thickener used for self-compact concrete. The method comprises the following steps: 1, weighing 2-acrylamide-2-methylpropanesulfonic acid and acrylic acid in proportion, processing to prepare an aqueous solution, and adjusting the pH value to 6.5-7.0; 2, adding a prepared monomer acrylamide solution with the concentration of 25-35% while stirring, uniformly stirring, dumping the obtained mixed solution into a flask, carrying out constant temperature water bath, and introducing nitrogen for protection; and 3, adding an initiator in a dropwise manner when the reaction temperature rises to 30-40DEG C, carrying out heat insulation at 40DEG C, carrying out a stirring reaction for about 1.5-2h, stopping the introduction of nitrogen when reactants are a viscous liquid, and carrying out constant temperature slaking for a period of time to obtain a white transparent colloid which is the thickener. The thickener obtained in the invention is used for preparing the self-compact concrete, has a good water solubility and a good thickening effect, can effectively improve the plastic viscosity of the self-compact concrete, and solves the water segregation and separation problems of the self-compact concrete.

Description

technical field [0001] The invention relates to the technical field of concrete structure and concrete engineering, in particular to the technical field of concrete admixture. Background technique [0002] Self-compacting concrete is a kind of concrete with high fluidity, no segregation, uniformity, stability, good construction performance and filling performance. When pouring, it relies on its own weight to flow and achieves compactness without vibration. After hardening, it has good mechanical properties and Compared with traditional vibrated concrete, it has the characteristics of no vibration, self-compacting, and good durability. It is one of the important development directions of high-performance concrete today. The workability of fresh self-compacting concrete, also known as self-compacting, includes four important aspects: flow capacity, filling force, gap passing capacity and segregation resistance. Fluidity and filling capacity refer to the ability of fresh self-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/06C08F220/58C08F220/56C08F4/40C08F2/10C04B24/16C04B28/00C04B18/08C04B14/06
CPCY02W30/91
Inventor 唐诗张夏真王胜年张夏虹黎鹏平范志宏王迎飞
Owner CCCC FOURTH HARBOR ENG INST
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