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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 discharge of air bubbles, large shrinkage, and high heat of hydration, and achieve the effect of reducing heat of hydration, improving properties, and reducing heat of hydration

Active Publication Date: 2022-07-01
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 methoxy polyethylene glycol acrylate with a molecular weight of 350 and deionized water into the reaction kettle and stir to heat up to 40°C to obtain A solution;

[0048] Then, hydrogen peroxide was added to solution A, and the mixed solution of deionized water of ascorbic acid and thioglycolic acid and the mixed solution of deionized water of acrylic acid, diethylene glycol monoacrylate and vinyl acetate were added dropwise at the same time, and the dropping time was 2h. After the dropwise addition, the reaction was kept at 40 °C for 1.5 h, and then cooled to room temperature to obtain B solution;

[0049] Finally, add liquid caustic soda to solution B, and adjust the pH to 6-7 to obtain viscosity reducing and shrinkage reducing agent; wherein methoxy polyethylene glycol acrylate, acrylic acid, diethylene glycol monoacrylate, vinyl acetate, hydrogen peroxide , the mass ratio of ascorbic acid and thioglyco...

Embodiment 2

[0053] (1) Synthesis of viscosity-reducing and shrinking-reducing agent: the same as in Example 1.

[0054] (2) Preparation of admixture: at room temperature, add 70% polycarboxylate water reducing agent in the production equipment according to the mass ratio, then add 3% hydration heat inhibitor under the condition of rotating speed of 240rpm, stir 15~20min; then add 12% viscosity reducing and shrinkage reducing agent, stir for 10~15min; finally add 15% polycarboxylate slump-retaining agent, stir until transparent and without bubbles, that is, the admixture for large volume ultra-high performance concrete is obtained W-2.

Embodiment 3

[0056] (1) Synthesis of viscosity-reducing and shrinking-reducing agent: firstly adding methoxy polyethylene glycol acrylate with a molecular weight of 400 and deionized water into the reaction kettle and stirring at a temperature of 50° C. to obtain A solution;

[0057] Then, hydrogen peroxide was added to solution A, and the mixed solution of deionized water of ascorbic acid and thioglycolic acid and the mixed solution of deionized water of acrylic acid, diethylene glycol monoacrylate and vinyl acetate were added dropwise at the same time, and the dropping time was 2.5h. , after the dropwise addition was completed, the reaction was incubated at 50 °C for 1 h, and then cooled to room temperature to obtain B solution;

[0058] Finally, add liquid caustic soda to solution B, and adjust the pH to 6-7 to obtain viscosity reducing and shrinkage reducing agent; wherein methoxy polyethylene glycol acrylate, acrylic acid, diethylene glycol monoacrylate, vinyl acetate, hydrogen peroxid...

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Abstract

The invention discloses an admixture for ultra-high performance concrete, which is made of raw materials in mass percentage: 60-70% polycarboxylate water reducing agent, 15-25% polycarboxylate slump-preserving agent, 5-15% reducing agent Viscosity reducing agent and 1-5% hydration heat inhibitor; the concrete admixture of the present invention has the functions of high fluidity, low viscosity, slump retention, early strength, low hydration heat, low shrinkage, etc. Performance requirements for ultra-high performance concrete for volume concrete structures.

Description

technical field [0001] The present 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 cable tower, because of its ultra-high glue content and ultra-low water-binder ratio design, the UHPC mixture has low fluidity, high viscosity, and high viscosity. The bubbles are not easy to be discharged, and the early strength is poor, especially the high hydration heat and the large shrinkage, which greatly limit its appli...

Claims

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Application Information

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Patent Type & Authority Patents(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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