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A kind of ultra-high performance concrete and preparation method thereof

An ultra-high performance, concrete technology, used in concrete and its preparation, green ultra-high performance concrete, and low viscosity fields, can solve the problems of long emptying time, poor workability, and low viscosity of inverted slump cylinders, and achieve emptying. Short time, simple method, good effect of reducing viscosity

Active Publication Date: 2022-02-11
国检测试控股集团北京有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the present invention, polyaspartic acid is used as the main chain of the water reducer, and polar amino groups are introduced into the main chain and the side chain at the same time, so that this self-made ultra-high performance water reducer has a unique molecular structure, High water-reducing rate (above 40%) and unique viscosity-reducing function. Therefore, a green, low-viscosity, strength grade C150 and above UHPC is obtained through the simple scientific and technological method of regulating the water-reducing agent, which solves the problem of traditional Technical problems such as high viscosity, poor workability, and long emptying time of the inverted slump cylinder

Method used

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  • A kind of ultra-high performance concrete and preparation method thereof
  • A kind of ultra-high performance concrete and preparation method thereof
  • A kind of ultra-high performance concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] An ultra-high performance water reducer is prepared by the following method:

[0041] (1) 29.05g propylene oxide and 70.4g oxirane are added in the reaction vessel, mix uniformly, pass into nitrogen; 2 Under a protective atmosphere, the temperature was raised to 80°C, and 0.22g of potassium hydroxide catalyst and 2.26g of cuprous chloride inhibitor were added. After reacting for 2 hours, 13.3g of L-aspartic acid was added, and the 2 The temperature was raised to 120°C under a protective atmosphere, and the reaction was continued for 3 hours, then cooled to room temperature, the product was extracted with ethyl acetate, washed with water 10 times, filtered, dried, and the solvent was removed to obtain side chain I.

[0042] (2) with 18g oxirane, 2g initiator aziridine, 25g diethanolamino carboxylic acid, in N 2 Under a protective atmosphere, react at 90°C for 4 hours to prepare polydiethanolaminocarboxylic acid-ethylene oxide adduct, add 20g L-aspartic acid, in N 2 Und...

Embodiment 2

[0045] An ultra-high performance water reducer is prepared by the following method:

[0046] (1) 34.86g propylene oxide and 74.8g oxirane are added in the reaction vessel, mix well, pass into nitrogen, in N 2 Under a protective atmosphere, the temperature was raised to 85°C, and 0.37g of sodium hydroxide catalyst and 2.46g of cuprous chloride inhibitor were added. After 2 hours of reaction, 13.3g of L-aspartic acid was added, and the 2 The temperature was raised to 100°C under a protective atmosphere, and the reaction was continued for 2 hours, then cooled to room temperature, the product was extracted with ethyl acetate, washed with water 12 times, filtered, dried, and the solvent was removed to obtain side chain I.

[0047] (2) 22g oxirane, 4g initiator aziridine, 10g diethanolaminocarboxylic acid in N 2 Under a protective atmosphere, react at 100°C for 4 hours to prepare polydiethanolaminocarboxylic acid-ethylene oxide adduct, add 25g L-aspartic acid, and 2 Under protecti...

Embodiment 3

[0050] An ultra-high performance water reducer is prepared by the following method:

[0051] (1) 40.67g propylene oxide and 79.2g oxirane are added in the reaction vessel, mix well, pass into nitrogen, in N 2 Under a protective atmosphere, the temperature was raised to 90°C, and 0.53g of potassium oxide catalyst and 3.99g of cuprous chloride inhibitor were added. After 2 hours of reaction, 13.3g of L-aspartic acid was added, and the 2 The temperature was raised to 110°C under a protective atmosphere, and the reaction was continued for 4 hours, then cooled to room temperature, the product was extracted with ethyl acetate, washed with water 10 times, filtered, dried, and the solvent was removed to obtain side chain I.

[0052] (2) 19g oxirane, 3g initiator aziridine, 20g diethanolaminocarboxylic acid in N 2 Under a protective atmosphere, react at 95°C for 4 hours to prepare polydiethanolaminocarboxylic acid-ethylene oxide adduct, add 20g of L-aspartic acid, in N 2 Under protec...

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Abstract

The invention discloses an ultra-high performance concrete and a preparation method thereof, comprising 500-1000 parts of cement, 200-300 parts of silica fume, 800-1000 parts of sand, 120-200 parts of steel fiber, and 20-20 parts of ultra-high performance water reducer 30 parts, 130-160 parts of water; first use propylene oxide / butylene oxide, ethylene oxide, and L-aspartic acid as raw materials to carry out polymerization reaction to synthesize side chain I, and then use diethanolaminocarboxylic acid, ring Oxyethane and L-aspartic acid are used as raw materials for polymerization reaction to synthesize side chain II, and finally side chain I, side chain II and L-aspartic acid are used as raw materials for graft polymerization to obtain ultra-high performance water reducer . The invention obtains a green, low-viscosity, C150 and above UHPC by adjusting the water reducer, which solves the technical problems of traditional UHPC such as high viscosity, poor workability, and long emptying time of inverted slump cylinders.

Description

technical field [0001] The invention relates to a concrete and a preparation method thereof, in particular to a low-viscosity, green ultra-high-performance concrete prepared by an ultra-high-performance water reducer using polyaspartic acid as the main chain; the polyaspartic acid is finally degraded The products are environmentally friendly ammonia, carbon dioxide and water, have good biodegradability, and are green products; the invention belongs to the technical field of building materials. Background technique [0002] Ultra-high performance concrete (UHPC for short) is a new type of material with ultra-high strength, toughness and durability. Because of its ultra-high glue content and ultra-low water-binder ratio design, UHPC has ultra-high compressive strength. and modulus of elasticity. In order to minimize the water-binder ratio of concrete, a water-reducing agent with a high water-reducing rate must be selected. At present, the water reducer used more in the prepa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C08G69/40C04B24/28C04B103/30
CPCC04B28/04C08G69/40C04B24/287C04B2201/50C04B2103/302C04B18/146C04B14/06C04B14/48
Inventor 秦宪明王博许文英张利俊蔡阳赵佳张嫚张瑞项斌峰王灵秀陈敏张少霞
Owner 国检测试控股集团北京有限公司
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