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Application of viscosity reducing polycarboxylic acid water reducer in preparing C100 concrete

A viscous polycarboxylic acid and concrete technology, applied in the field of concrete admixtures, can solve the problems of reducing water evaporation shrinkage force, reducing surface tension, high viscosity, etc. rate effect

Active Publication Date: 2019-04-26
广西红墙新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the hydrophobic alkyl group and ester group are located on the PEG side chain, the water reducer of the present invention has the following four main advantages: 1. Its content does not affect the adsorption and dispersion in the copolymer -COO - 2. The content of hydrophobic alkyl and ester groups can be adjusted at will according to the actual needs of the viscosity-reducing effect, so as to effectively solve the problem of high viscosity and flow rate in high-grade concrete. The purpose of the slow problem; 3. Since the PEG side chain contains a large number of hydrophobic viscosity-reducing alkyl groups and ester groups, the water-reducer molecules cannot form a complete water layer film on the surface of cement particles, but form a collapsed water layer film with defects , this defective collapsed water film endows the superplasticizer with the following characteristics: (1) it can release more free water and reduce the viscosity of the cement paste; (2) the molecular weight of the superplasticizer is not subject to the requirement of viscosity reduction (3) The length of the PEG side chain is not limited by the requirement for viscosity reduction; 4. The introduction of a large number of hydrophobic alkyl groups and ester groups in 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, and has a good shrinkage reduction effect

Method used

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  • Application of viscosity reducing polycarboxylic acid water reducer in preparing C100 concrete
  • Application of viscosity reducing polycarboxylic acid water reducer in preparing C100 concrete
  • Application of viscosity reducing polycarboxylic acid water reducer in preparing C100 concrete

Examples

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Effect test

Embodiment 1

[0062] The preparation method of the viscosity-reducing polycarboxylate water reducer of the present invention, the preparation method comprises the following steps:

[0063] (1) Synthesis of viscosity-reducing active macromonomer D:

[0064] 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 30 mol of 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.

[0065] (2) Synthesis of viscosity-reducing polycarboxylate superplasticizer

[0066] 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...

Embodiment 2

[0070] The preparation method of the viscosity-reducing polycarboxylate water reducer of the present invention, the preparation method comprises the following steps:

[0071] (1) Synthesis of viscosity-reducing active macromonomer D:

[0072] 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 30 mol of Glycerin butyrate 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.

[0073] (2) Synthesis of viscosity-reducing polycarboxylate superplasticizer

[0074] 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 3

[0078] The preparation method of the viscosity-reducing polycarboxylate water reducer of the present invention, the preparation method comprises the following steps:

[0079] (1) Synthesis of viscosity-reducing active macromonomer D:

[0080] 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 15 mol of ring Oxyalkane and 15mol glycidyl butyrate were added dropwise in 3 hours, and the reaction was continued at 100°C for 8 hours to obtain the viscosity-reducing active macromonomer D.

[0081] (2) Synthesis of viscosity-reducing polycarboxylate superplasticizer

[0082] 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 obtai...

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Abstract

The invention provides concrete which comprises a synthesized viscosity reducing polycarboxylic acid water reducer. The invention further provides an application of the viscosity reducing polycarboxylic acid water reducer shown as formula (I) in preparing the C100 concrete. Compared with the prior art, the C100 concrete prepared from the viscosity reducing polycarboxylic acid water reducer is freefrom segregating, weeping and precipitation, good in slump retentivity with time, flowability and placeability, soft and appropriate in viscosity. The concrete is high in strength.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to the use of a viscosity-reducing polycarboxylate water reducer in the preparation of C100 concrete. Background technique [0002] In recent years, with the increase of infrastructure construction in our country, 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 problem of high-strength ultra-high-strength concrete viscosity is a long-standing technical problem. At present,...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B24/32C08F283/06C08F220/06C04B103/30
CPCC04B24/32C04B28/00C04B2103/302C08F283/065C08F220/06C04B18/08C04B14/02C04B18/146C04B14/06
Inventor 张小富白淑英赵利华
Owner 广西红墙新材料有限公司
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