Admixture for ultra-high performance concrete and preparation method thereof

An ultra-high-performance concrete technology, applied in the field of concrete additives, can solve the problems of difficult air bubble discharge, large shrinkage, poor early strength, etc., and achieve the effects of reducing heat of hydration, inhibiting shrinkage, and inhibiting hydration

Active Publication Date: 2020-06-12
CCCC SHEC WUHAN PORT NEW MATERIALS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for some large-volume concrete structures that require ultra-high performance, such as the steel-concrete joint section of the tower, due to the ultra-high amount of adhesive material and ultra-low water-binder ratio design, the UHPC mixture has low fluidity, high viscosity, Bubbles are not easy to discharge, poor early strength, especially high heat of hydration and large shrinkage, which greatly limit its application and development

Method used

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  • Admixture for ultra-high performance concrete and preparation method thereof
  • Admixture for ultra-high performance concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Synthesis of viscosity reducing agent:

[0047] First, add methoxypolyethylene glycol acrylate with a molecular weight of 350 and deionized water into the reaction kettle and stir to raise the temperature to 40°C to obtain A solution;

[0048] Then add hydrogen peroxide in the A solution, and drop the deionized water mixed solution of ascorbic acid and thioglycolic acid and the deionized water mixed solution of acrylic acid, diethylene glycol monoacrylate and vinyl acetate respectively simultaneously, and the dropping time is 2h, After the dropwise addition, keep the reaction at 40°C for 1.5h, then cool to room temperature to obtain solution B;

[0049] Finally, liquid caustic soda is added to solution B, and the pH value is adjusted to 6-7 to obtain a viscosity-reducing agent; among them, methoxypolyethylene glycol acrylate, acrylic acid, diethylene glycol monoacrylate, vinyl acetate, hydrogen peroxide , Ascorbic acid, thioglycolic acid mass ratio is 3.5:1:0.55:0....

Embodiment 2

[0053] (1) Synthesis of viscosity reducer and shrinkage reducer: with embodiment 1.

[0054] (2) Preparation of admixture: at normal temperature, first add 70% polycarboxylate superplasticizer in the production equipment according to the mass ratio, then add 3% hydration heat inhibitor under the condition that the rotating speed is 240rpm, stir 15 to 20 minutes; then add 12% viscosity reducer and stir for 10 to 15 minutes; finally add 15% polycarboxylate slump retaining agent and stir until transparent and free of air bubbles to obtain the admixture for large-volume ultra-high performance concrete W-2.

Embodiment 3

[0056] (1) Synthesis of viscosity reducer and shrinkage reducer: first add methoxypolyethylene glycol acrylate with a molecular weight of 400 and deionized water into the reactor and stir to raise the temperature to 50°C to obtain A solution;

[0057] Then add hydrogen peroxide to solution A, and drop the deionized water mixed solution of ascorbic acid and thioglycolic acid and the deionized water mixed solution of acrylic acid, diethylene glycol monoacrylate and vinyl acetate respectively dropwise at the same time, and the dropping time is 2.5h , after the dropwise addition, keep the reaction at 50°C for 1h, then cool to room temperature to obtain the B solution;

[0058] Finally, liquid caustic soda is added to solution B, and the pH value is adjusted to 6-7 to obtain a viscosity-reducing agent; wherein methoxypolyethylene glycol acrylate, acrylic acid, diethylene glycol monoacrylate, vinyl acetate, hydrogen peroxide , Ascorbic acid, thioglycolic acid mass ratio is 4.0:1:0.6...

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Abstract

The invention discloses an admixture for ultra-high performance concrete. The admixture is prepared from the following raw materials in percentage by mass: 60-70% of a polycarboxylate water reducing agent, 15-25% of a polycarboxylate slump retaining agent, 5-15% of a viscosity and shrinkage reducing agent and 1-5% of a hydration heat inhibitor. The admixture disclosed by the invention has multiplefunctions of high fluidity, low viscosity, slump loss resistance, early strength, low hydration heat, low shrinkage and the like, and can meet the performance requirements of a mass concrete structure on ultra-high performance concrete.

Description

technical field [0001] The invention relates to the field of concrete additives. More specifically, the present invention relates to an admixture for ultra-high performance concrete and a preparation method thereof. Background technique [0002] As a new type of material with ultra-high strength, toughness and durability, ultra-high performance concrete (UHPC) is gradually replacing ordinary or high-performance concrete in some thin structures such as steel bridge deck pavement and prefabricated components. . However, for some large-volume concrete structures that require ultra-high performance, such as the steel-concrete joint section of the tower, due to the ultra-high amount of adhesive material and ultra-low water-binder ratio design, the UHPC mixture has low fluidity, high viscosity, The bubbles are not easy to discharge, the early strength is poor, especially the heat of hydration is high, and the shrinkage is large, which greatly limits its application and developme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C08F283/06C08F220/06
CPCC04B40/0039C04B24/2694C08F283/065C04B2103/302C04B2103/308C04B24/045C08F220/06
Inventor 高玉军吴小斌李顺凯邓翀余登文罗运沈尔卜
Owner CCCC SHEC WUHAN PORT NEW MATERIALS
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