Slump-retaining concrete water reducing agent and preparation method thereof

A technology of concrete water reducer and water reducer, which is applied in the field of concrete admixtures, can solve the problems of reduced dispersion performance and dispersion retention performance, reduced concrete workability, excessive concrete loss, etc., and achieves the suppression of early calcium hydroxide. Generates, enhances mechanical strength, and maintains long-term fluidity

Active Publication Date: 2022-08-09
四川金江建材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional polycarboxylate superplasticizer is very sensitive to the mud content in the aggregate, which shows that as the mud content increases, the dispersion performance and dispersion retention performance of the polycarboxylate superplastici

Method used

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  • Slump-retaining concrete water reducing agent and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of branched monomers:

[0030] Step S21, mixing itaconic acid and toluene, adding a Custer catalyst, stirring for 30 min, then adding tetramethyldisiloxane, continuing to stir the reaction for 48 h, and concentrating under reduced pressure after the reaction to remove the solvent to obtain a carboxyl monomer; The dosage ratio of peronic acid, tetramethyldisiloxane and Custer catalyst is 0.02mol:0.01mol:0.4mL;

[0031] Step S22 , under nitrogen protection, mix the carboxyl monomer and N,N-dimethylacetamide, add triethanolamine and p-toluenesulfonic acid, and react at 140° C. for 6 hours to obtain a branched monomer. The mass ratio of carboxyl monomer, triethanolamine and p-toluenesulfonic acid is 26:29:1.

Embodiment 2

[0033] Preparation of branched modified water reducing agent:

[0034] Step S11, mix methallyl polyoxyethylene ether and deionized water, set the temperature to 60°C, add maleic anhydride, stir for 10 min, add acrylic acid, diethyl vinylphosphonate, monomer c and ammonium persulfate , after the dropwise addition, the temperature was raised to 75°C, and the branched monomer prepared in Example 1 was added. After the addition, the temperature was kept unchanged, and the reaction was kept for 4h; the polymerization product was obtained; methallyl polyoxyethylene ether, Maleic anhydride, acrylic acid, diethyl vinylphosphonate and sodium methacrylic acid sulfonate are used in a molar ratio of 1:0.6:1.6:1.2:0.8; the addition amount of ammonium persulfate is methallyl polyoxyethylene ether 0.4% of the mass, and the added amount of branching monomers is 40% of the mass of methallyl polyoxyethylene ether.

[0035] Step S12, under nitrogen protection, mix the polymer product obtained i...

Embodiment 3

[0037] A preparation method of a slump-preserving concrete water reducing agent, comprising the following steps:

[0038] In parts by weight, 80 parts of the branched modified water-reducing agent prepared in Example 2, 2 parts of PEG400, 8 parts of sodium lignin sulfate, and 60 parts of water were mixed to obtain a slump-preserving concrete water-reducing agent.

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Abstract

The invention relates to a slump-retaining concrete water reducing agent and a preparation method thereof. The water reducing agent comprises the following raw materials in parts by weight: 80-90 parts of a branched modified water reducing agent, 2-3 parts of a small molecular polymer, 8-9 parts of a slump-retaining auxiliary agent and 60-80 parts of water, in the preparation process of the water reducer, a branched monomer is introduced for branched modification, so that the generation of early calcium hydroxide can be inhibited, gaps are filled, and the mechanical strength is enhanced. Meanwhile, the strong adsorption capacity of phosphonic acid groups is utilized, the plastic viscosity of a system is effectively reduced, adsorption to a water reducing agent and mixing water is reduced, the dispersing performance is improved, the viscosity of concrete is reduced, the cement hydration process is delayed through the retarding effect of the phosphonic acid groups, and the long-time flow retention capacity is shown. According to the invention, a plurality of branched chains are grafted on cement, and the branched chains not only can provide a steric hindrance effect, but also can release polycarboxylic acid with a dispersion effect in a high-alkalinity environment of cement hydration to control slump loss.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a slump-preserving concrete water reducer and a preparation method thereof. Background technique [0002] Concrete water reducer is currently the largest and most widely used concrete admixture. Its function is to significantly reduce the amount of water added when mixing concrete, and at the same time greatly improve the fluidity and strength of concrete when it is freshly mixed, thereby improving the quality of the project. [0003] Traditional superplasticizers such as polyester and polyether superplasticizers still have the disadvantages of high water-cement ratio, low concrete fluidity, small compactness, large cement dosage, and poor concrete strength and durability. There is also a problem that the water reducing agent cannot fully reflect its excellent water reducing performance due to the large amount of water reducing agent and the weak slump re...

Claims

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Application Information

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IPC IPC(8): C04B24/32C04B24/16C08F283/06C08F222/06C08F220/06C08F230/02C08F228/02C08F230/08C08F8/42C04B103/30
CPCC04B40/0039C04B24/166C08F283/065C08F8/42C04B2103/302C04B24/18C04B24/32C08F222/06C08F220/06C08F230/02C08F228/02C08F230/085Y02W30/91
Inventor 高燕萍马洋
Owner 四川金江建材科技有限公司
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