A special superplasticizer for high- and ultra-high-strength concrete and its preparation method

A technology of ultra-high-strength concrete and superplasticizers, which is applied in the field of concrete superplasticizers, and can solve problems such as weak adhesion, difficult construction, and weakened friction of ordinary water-reducing agents.

Active Publication Date: 2022-04-22
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary water reducers have weak adhesion on the surface of low / weak electric particles, and cannot effectively cover all powder particle surfaces
In medium and low-strength concrete, the volume fraction of solid particles is not high, and this effect is not obvious; but in high / ultra-high-strength concrete, the volume fraction of solid particles is high, and ordinary water reducing agents have limited weakening of the friction between particles, resulting in slurry High viscosity, difficult construction
[0006] However, the above-mentioned existing new technology (water reducer products) failed to solve the problem fundamentally. These water reducers have not been specially designed, and their adhesion to the surface of weakly charged or negatively charged particles is weak, and they cannot adhere to the surface of all particles. Effective coverage, so the concrete viscosity is still high, the effect is very limited, the water-binder ratio of the reported concrete is mostly between 0.2-0.35, which belongs to conventional high-strength concrete, and rarely involves ultra-high-strength concrete

Method used

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  • A special superplasticizer for high- and ultra-high-strength concrete and its preparation method
  • A special superplasticizer for high- and ultra-high-strength concrete and its preparation method
  • A special superplasticizer for high- and ultra-high-strength concrete and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] (1) Add anhydrous dimethyl sulfoxide (1041.2 parts) to the reactor, adjust the temperature to 60°C, and continuously and uniformly add A1 (114.12 parts), B1 (3.13 parts), and the initiator azo A solution of diisobutyronitrile in dimethyl sulfoxide (0.2 parts of azobisisobutyronitrile dissolved in 100 parts of dimethyl sulfoxide), added dropwise for 6 hours, and continued to insulate for 6 hours after the dropwise addition, to obtain the solution of the intermediate;

[0079] (2) Adjust the temperature of the intermediate solution prepared in step (1) to 100°C, add C1 (250 parts), D1 (33.28 parts) and E1 (21.72 parts) to it at one time, and add 4.19 parts of lithium hydroxide at the same time, When starting to add the reactant and the auxiliary reaction reagent, the stirring reaction 24 obtains the mixed solution of the intermediate;

[0080] (3) Add 15 parts of anhydrous dimethyl sulfoxide to another reactor, and add phosphoric acid (14.7 parts) to it, adjust the temper...

Embodiment 2

[0082] (1) Add anhydrous dimethyl sulfoxide (266.18 parts) to the reactor, adjust the temperature to 70°C, and add A2 (128.13 parts), B2 (5.97 parts), I1 (4.96 parts) continuously and uniformly dropwise , and a solution of benzoyl peroxide (anhydrous, dehydrated by recrystallization) in anhydrous dimethyl sulfoxide (5.323 parts dissolved in 266.18 parts), added dropwise for 4h, and continued to insulate for 6h after the dropwise addition, to obtain intermediate body solution;

[0083] (2) Adjust the temperature of the intermediate solution prepared in step (1) to 150°C, add C2 (1000 parts), D2 (102.99 parts) and E2 (17.36 parts) to it at one time, and add 25.07 parts of sodium tert-butoxide at the same time , timing since the reactant and the co-reaction reagent start to add, stirring and reacting for 12h to obtain the mixed solution of the intermediate;

[0084] (3) Add 5 parts of anhydrous dimethyl sulfoxide to another reactor, and add pyrophosphoric acid (4.45 parts) and w...

Embodiment 3

[0086] (1) add anhydrous N-methylpyrrolidone (200 parts) in the reactor, adjust temperature to 40 ℃, add A3 (142.15 parts), B3 (2.34 parts), I2 (13.01 parts) to it simultaneously, add Among them, tert-butyl hydroperoxide (3.965 parts) and N-methylpyrrolidone solution of ethanethiol (0.683 parts dissolved in 110.33 parts) were evenly added dropwise respectively, added dropwise for 3 hours, and continued to keep warm for 1 hour after the addition was completed to obtain the intermediate The solution;

[0087] (2) Adjust the temperature of the intermediate solution prepared in step (1) to 40°C, add C3 (800 parts), D3 (6.06 parts) and E3 (6.15 parts) to it at one time, and add 19.35 parts of lithium hydroxide at the same time, Timing since the reactant and the auxiliary reaction reagents start to add, stirring the reaction for 24h to obtain the mixed solution of the intermediate;

[0088] (3) Add 100 parts of anhydrous N-methylpyrrolidone to another reactor, and add phosphorus pe...

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Abstract

The invention discloses a special superplasticizer for high- and super-high-strength concrete and a preparation method thereof. The preparation method of the superplasticizer of the present invention comprises: using a solvent, a polymerizable monomer A, a chain transfer agent B, a polymerizable monomer I and an initiator to initiate polymerization to obtain an intermediate solution; then adding polyether C, amino acid D and the small molecule peptide E, while adding the auxiliary reaction reagent F to obtain an intermediate mixed solution; adding the intermediate mixed solution to the mixed solution of phosphoric acid composition G and water dissolved in a solvent to obtain the superplasticizer solution. Compared with commercially available common superplasticizers, the superplasticizer of the present invention is applied to high-strength concrete above C50, and its consumption can be significantly reduced to achieve the same fluidity, and the workability can be significantly improved under the same fluidity conditions, and the slump can be shortened. Shorten the emptying time of the cylinder and reduce the viscosity; when applied to ultra-high-strength concrete above C100, its advantages are more prominent, and the dosage and viscosity can be significantly reduced.

Description

technical field [0001] The invention relates to the field of superplasticizers used in concrete, in particular to a special superplasticizer for high- and super-high-strength concrete and a preparation method thereof. Background technique [0002] The term "concrete" is used here generally indiscriminately to mean concrete such as concrete, mortar or grout, and this applies elsewhere in this document as well. [0003] Since the invention of high-performance water reducer (polycarboxylate water reducer), it has been widely used and developed greatly, and it has become an indispensable component in concrete. Generally, the polycarboxylate superplasticizer is a comb-shaped structure, which is generally prepared by free radical polymerization of vinyl monomers, and its main chain (generally -CH 2 -CH 2 - Structural or functional group substituted =CH-CH 2 - structure) is connected with charged functional groups (such as carboxyl, sulfonic acid groups, etc.), and the correspon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F216/14C08F220/32C04B24/26C04B24/16C04B103/32
CPCC08F283/06C04B24/246C04B24/165C04B2103/32C08F216/1416
Inventor 舒鑫刘加平杨勇王秀梅严涵赵红霞张建纲张志勇王衍伟
Owner JIANGSU SOBUTE NEW MATERIALS
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