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Application of viscosity-reducing polycarboxylate superplasticizer containing alkyl in preparation of C100 concrete

A technology of concrete and water reducing agent, which is applied in the field of preparing C100 concrete. It can solve the problems of reducing surface tension, reducing water evaporation shrinkage, high viscosity, etc., and achieves low viscosity, significant viscosity reduction and shrinkage effect, and high water reducing rate. Effect

Active Publication Date: 2019-05-21
GUANGDONG REDWALL NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the hydrophobic alkyl group is located on the side chain of PEG, the water reducer of the present invention has the following four main advantages: 1. Its content does not affect the adsorption and dispersion of -COO in the copolymer - 2. The content of hydrophobic alkyl groups can be adjusted at will according to the actual needs of the viscosity-reducing effect, so as to effectively solve the problems of high viscosity and slow flow rate in high-grade concrete. Purpose; 3. Since the PEG side chain contains a large number of hydrophobic viscosity-reducing alkyl groups, the water reducer molecules cannot form a complete water film on the surface of cement particles, but form a collapsed water film with defects. The water layer film endows the water reducing agent with the following characteristics: (1) It can release more free water and reduce the viscosity of cement paste; (2) The molecular weight of the water reducing agent is not limited by the viscosity reduction requirements; (3) PEG The length of the side face is not limited by the requirement for viscosity reduction; 4. The large amount of hydrophobic alkyl groups introduced into the PEG side chain greatly reduces the surface tension of the product and reduces the shrinkage force of water evaporation, thereby reducing the shrinkage and cracking of concrete. good downscaling

Method used

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  • Application of viscosity-reducing polycarboxylate superplasticizer containing alkyl in preparation of C100 concrete
  • Application of viscosity-reducing polycarboxylate superplasticizer containing alkyl in preparation of C100 concrete
  • Application of viscosity-reducing polycarboxylate superplasticizer containing alkyl in preparation of C100 concrete

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Comparison scheme
Effect test

Embodiment 1

[0061] The preparation method of the viscosity-reducing polycarboxylate water reducer of the present invention, the preparation method comprises the following steps:

[0062] (1) Synthesis of viscosity-reducing active macromonomer D:

[0063] In a four-necked glass flask equipped with a stirrer, a thermometer, a reflux condenser, and a dropping device, add 1 mol of methallyl alcohol, 2 g of sodium hydride, stir under nitrogen protection, and dropwise add 1 mol of cyclo The oxyalkane was added dropwise in 2 hours, and the reaction was continued at 90°C for 6 hours to obtain the viscosity-reducing active macromonomer D.

[0064] (2) Synthesis of viscosity-reducing polycarboxylate superplasticizer

[0065] Dissolving reactive monomer B, reactive monomer C, reactive monomer D, and oxidizing agent in water to obtain solution 1, dissolving reactive monomer A and chain transfer agent in water to obtain solution 2, dissolving reducing agent in water to obtain solution 3, Under norma...

Embodiment 2

[0069] The preparation method of the viscosity-reducing polycarboxylate water reducer of the present invention, the preparation method comprises the following steps:

[0070] (1) Synthesis of the viscosity-reducing active macromonomer D:

[0071] In a four-necked glass flask equipped with a stirrer, a thermometer, a reflux condenser, and a dropping device, add 1 mol of methallyl alcohol, 2 g of sodium hydride, stir under nitrogen protection, and dropwise add 10 mol of ring The oxyalkane was added dropwise in 3 hours, and the reaction was continued at 100°C for 8 hours to obtain the viscosity-reducing active macromonomer D.

[0072] (2) Synthesis of viscosity-reducing polycarboxylate superplasticizer

[0073] Dissolving reactive monomer B, reactive monomer C, reactive monomer D, and oxidizing agent in water to obtain solution 1, dissolving reactive monomer A and chain transfer agent in water to obtain solution 2, dissolving reducing agent in water to obtain solution 3, Under ...

Embodiment 3

[0077] The preparation method of the viscosity-reducing polycarboxylate water reducer of the present invention, the preparation method comprises the following steps:

[0078] (1) Synthesis of the viscosity-reducing active macromonomer D:

[0079] In a four-necked glass flask equipped with a stirrer, a thermometer, a reflux condenser, and a dropping device, add 1 mol of methallyl alcohol, 2 g of sodium hydride, stir under nitrogen protection, and drop 30 mol of ring The oxyalkane was added dropwise in 3 hours, and the reaction was continued at 100°C for 10 hours to obtain the viscosity-reducing active macromonomer D.

[0080] (2) Synthesis of viscosity-reducing polycarboxylate superplasticizer

[0081] Dissolving reactive monomer B, reactive monomer C, reactive monomer D, and oxidizing agent in water to obtain solution 1, dissolving reactive monomer A and chain transfer agent in water to obtain solution 2, dissolving reducing agent in water to obtain solution 3, Under normal te...

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Abstract

The invention provides concrete. The concrete contains the viscosity-reducing polycarboxylate superplasticizer synthesized in the invention. The invention also provides an application of the viscosity-reducing polycarboxylate superplasticizer shown in a formula (I) in preparation of C100 concrete. Compared with the prior art, the C100 concrete prepared by using the viscosity-reducing polycarboxylate superplasticizer provided by the invention has the advantages of no segregation, no bleeding and no bottom peeling, good age slump retention, good fluidity, good workability, soft material withoutbottom sticking, proper viscosity, good compactness of concrete and high strength.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to the use of a viscosity-reducing water reducer containing an alkyl group in the preparation of C100 concrete. Background technique [0002] In recent years, with the increase of my country's infrastructure construction, high-grade concrete is gradually entering the building material market due to its high strength, good integrity and low weight, especially in bridge engineering. However, due to the use of a large amount of gel material and low water-binder ratio, high-grade concrete has the problems of high viscosity and slow flow speed, which in turn causes problems in concrete mixing, transportation, pumping and construction, which largely limits high-strength super Promotion and application of high-strength concrete. [0003] For engineers and technicians, the high-strength ultra-high-strength concrete viscosity problem is a long-standing technical problem. At pre...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B24/26C08F283/06C08F220/06C04B103/30
Inventor 张小富白淑英赵利华
Owner GUANGDONG REDWALL NEW MATERIALS
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