Application of early-strength viscosity-reducing type polycarboxylic acid water-reducing agent in preparation of prefabricated member concrete

A technology of concrete and water reducer, which is applied in the field of early-strength viscosity-reducing polycarboxylate water-reducer to prepare prefabricated concrete, which can solve the problems of retardation and high viscosity, low early strength viscosity, and poor durability.

Active Publication Date: 2019-03-19
GUANGDONG REDWALL NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In view of the above-mentioned technical defects that exist, the present invention introduces the active macromonomer D with the function of reducing viscosity and the active macromonomer E with the function of early strength in the molecular structure according to the polymer structure design theory, so that the concrete has a higher Early strength and low viscosity, thus solving the technical problems of slow setting and high viscosity of polycarboxylate water reducer in the application of concrete prefabricated components
[0013] The present invention achieves this purpose by introducing hydrophobic viscosity-reducing PEO side chains and cationic quaternary ammonium salt PEO / PPO side chains into the molecular structure of polycarboxylic acid, and at the same time solves the problem of concrete late-stage strength degradation caused by traditional super-early-strength technology. Shrinkage, poor durability

Method used

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  • Application of early-strength viscosity-reducing type polycarboxylic acid water-reducing agent in preparation of prefabricated member concrete
  • Application of early-strength viscosity-reducing type polycarboxylic acid water-reducing agent in preparation of prefabricated member concrete
  • Application of early-strength viscosity-reducing type polycarboxylic acid water-reducing agent in preparation of prefabricated member concrete

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Effect test

Embodiment 1

[0067] The preparation method of the early-strength viscosity-reducing polycarboxylate superplasticizer of the present invention, the preparation method comprises the following steps:

[0068] (1) Synthesis of viscosity-reducing active macromonomer D:

[0069] 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 8 hours to obtain the viscosity-reducing active macromonomer D.

[0070] (2) Synthesis of early-strength viscosity-reducing polycarboxylate superplasticizer

[0071] Dissolve reactive monomer B, reactive monomer C, reactive monomer D, reactive monomer E, and an oxidizing agent in water to obtain solution 1, dissolve reactive monomer A and chain transfer agent in water to obtain solution 2, and dissolve the reducin...

Embodiment 2

[0075] The preparation method of the early-strength viscosity-reducing polycarboxylate superplasticizer of the present invention, the preparation method comprises the following steps:

[0076] (1) Synthesis of viscosity-reducing active macromonomer D:

[0077] 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 and 2 g of sodium hydride, stir under nitrogen protection, and add 30 mol dropwise at a constant speed at 90 ° C. , Ethyl 3-epoxy 3-phenylpropionate 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.

[0078] (2) Synthesis of early-strength viscosity-reducing polycarboxylate superplasticizer

[0079] Dissolve reactive monomer B, reactive monomer C, reactive monomer D, reactive monomer E, and an oxidizing agent in water to obtain solution 1, dissolve reactive monomer A and chain transfer agent ...

Embodiment 3

[0083] The preparation method of the early-strength viscosity-reducing polycarboxylate superplasticizer of the present invention, the preparation method comprises the following steps:

[0084] (1) Synthesis of viscosity-reducing active macromonomer D:

[0085] 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 ethyl 2,3 epoxy 3-phenylpropionate 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.

[0086] (2) Synthesis of early-strength viscosity-reducing polycarboxylate superplasticizer

[0087] Dissolve reactive monomer B, reactive monomer C, reactive monomer D, reactive monomer E, and an oxidizing agent in water to obtain solution 1, dissolve reactive monomer A and chain transfer agent in wa...

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Abstract

The invention provides concrete and also provides an application of an early-strength viscosity-reducing type polycarboxylic acid water-reducing agent of Formula (I) in preparation of prefabricated member concrete. The prefabricated member concrete produced by using the early-strength viscosity-reducing type polycarboxylic acid water-reducing agent of Formula (I) is soft in texture, easy in distribution and good in slump retention; after the construction is finished, the concrete can lose flowability instantaneously, initial setting and final setting are rapid and the early-strength development is fast. The application provided by the invention has the beneficial effects that no steaming and curing or no pressure steaming and curing is realized, and a production process with normal-temperature natural curing is adopted, so that the mold turnover period is shortened, the energy is saved and the environment is protected.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to the use of an early-strength viscosity-reducing polycarboxylate water reducer in preparing prefabricated concrete. Background technique [0002] In recent years, with the promulgation and promotion of national policies on prefabricated buildings, and the successive introduction of preferential policies for prefabricated buildings by local governments, prefabricated buildings have achieved rapid development across the country. Prefabricated prefabricated components have many advantages over cast-in-place concrete: ① fast construction; ② save manpower; ③ improve the site environment; ④ high-quality and high-precision components; ⑤ good economic benefits. At present, this kind of production of prefabricated concrete components and prefabricated construction methods has attracted more and more attention from engineering construction personnel. [0003] Precast concrete t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/02C04B24/32C04B103/30
CPCC04B24/32C04B28/02C04B2103/302C04B2111/00017C04B2201/50C04B18/08C04B18/141C04B14/02C04B14/06
Inventor 张小富白淑英赵利华
Owner GUANGDONG REDWALL NEW MATERIALS
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