Early-strength water reducing agent for machine-made sand concrete prestressed component and preparation method thereof

A concrete and prestressing technology, applied in the field of early-strength superplasticizer for prestressed components of machine-made sand concrete and its preparation field, can solve the problems of low strength of superplasticizer, poor adaptability of machine-made sand concrete, etc. Cement hydration speed, simple effect of preparation method

Inactive Publication Date: 2020-08-28
RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main technical problem to be solved by the present invention is to provide an early-strength water reducer for machine-made sand concrete prestressed components and its preparation method, which not only solves the problem that most products in the prior art increase the strength by compounding, but also Solve the problem of poor adaptability to machine-made sand concrete, the water reducer has the characteristics of low early strength and wide adaptability

Method used

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  • Early-strength water reducing agent for machine-made sand concrete prestressed component and preparation method thereof

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Effect test

Embodiment 1

[0027] An early-strength water-reducing agent for machine-made sand concrete prestressed components, composed of raw materials of the following weights: acrylic acid 41g, acrylamide 10g, sodium methacrylate 5g, polyethylene glycol diacrylate 15g, vitamin C 0.7 g. Mercaptopropionic acid 2.0g, methallyl polyoxyethylene ether monomer with a molecular weight of 4000 365g, hydrogen peroxide 4.0g with a concentration of 27.5wt% and deionized water 530g, the deionized water includes the first part 100g of ionized water, 80g of the second portion of deionized water, 100g of the third portion of deionized water, and 250g of the fourth portion of deionized water.

[0028] The preparation method includes the following steps:

[0029] (1) Add 41g acrylic acid, 10g acrylamide, 5g sodium methacrylic acid sulfonate and 100g deionized water in sequence to obtain mixed solution A, which is ready for use;

[0030] (2) Mix 15 g of polyethylene glycol diacrylate and 80 g of deionized water to obtain mi...

Embodiment 2

[0035] An early-strength water-reducing agent for machine-made sand concrete prestressed components, which is composed of raw materials of the following weights: acrylic acid 36g, acrylamide 8g, sodium methacrylate 3g, polyethylene glycol diacrylate 10g, heptahydrate and Ferrous sulfate 0.15g, mercaptoethanol 0.5g, molecular weight 5000 methallyl polyoxyethylene ether monomer 365g, ammonium persulfate 1.8g and deionized water 530g, the deionized water includes the first part of deionized water 100g of water, 80g of the second portion of deionized water, 100g of the third portion of deionized water, and 250g of the fourth portion of deionized water.

[0036] The preparation method includes the following steps:

[0037] (1) Add 36g acrylic acid, 8g acrylamide, 3g sodium methacrylic acid sulfonate and 100g deionized water in sequence to obtain mixed solution A, which is ready for use;

[0038] (2) Mix 10g polyethylene glycol diacrylate and 80g deionized water to obtain mixed solution B...

Embodiment 3

[0043] An early-strength water-reducing agent for machine-made sand concrete prestressed components, consisting of raw materials of the following weights: acrylic acid 34g, acrylamide 8g, sodium methacrylic acid 2g, polyethylene glycol diacrylate 15g, vitamin C 0.7 g. Mercaptoethanol 2.4g, methallyl polyoxyethylene ether monomer with a molecular weight of 6000 365g, ammonium persulfate 1.5g and deionized water 500g, the deionized water includes the first part of deionized water 100g, the first part Two parts of deionized water 80g, the third part of deionized water 100g and the fourth part of deionized water 220g.

[0044] The preparation method includes the following steps:

[0045] (1) Add 34g acrylic acid, 8g acrylamide, 2g sodium methacrylic acid sulfonate and 100g deionized water in sequence to obtain mixed solution A, which is ready for use;

[0046] (2) Mix 15 g of polyethylene glycol diacrylate and 80 g of deionized water to obtain mixed solution B for use;

[0047] (3) Mix 0...

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Abstract

The invention discloses an early-strength water reducing agent for a machine-made sand concrete prestressed component and a preparation method thereof. The water reducing agent is prepared from the following raw materials: acrylic acid, an amide unsaturated monomer, a sulfonate unsaturated monomer, unsaturated alcohol ester, a first initiator, a chain transfer agent, methyl allyl polyoxyethylene ether, a second initiator and deionized water. The preparation method comprises the following steps: mixing acrylic acid, an amide unsaturated monomer, a sulfonate unsaturated monomer and deionized water to obtain a mixed solution A; mixing unsaturated alcohol ester with deionized water to obtain a mixed solution B; mixing the first initiator, the chain transfer agent and the deionized water to obtain a mixed solution C; mixing and dissolving methyl allyl polyoxyethylene ether and the deionized water, heating, adding the second initiator, dropwise adding the mixed solutions A, B and C, and finally adding alkali for neutralization. The water reducing agent has higher water reducing rate and better early strength effect. The preparation method is simple, raw materials are easy to obtain, therequirement for production equipment is low and safety is high.

Description

Technical field [0001] The invention relates to the technical field of building concrete admixtures, in particular to an early-strength water reducer for machine-made sand concrete prestressed members and a preparation method thereof. Background technique [0002] Polycarboxylic acid water reducer has the characteristics of high dispersibility, high water reduction rate and high slump retention, and has been widely used in concrete engineering. With the rapid development of my country's economy and technology, the scale of my country's infrastructure has also become larger. In many projects, especially the actual production of prefabricated components, it is required to speed up the construction progress, accelerate the turnover of molds, and achieve maximum benefits. The demand for early-strength mother liquor is increasing. In addition, the early-strength polycarboxylate water-reducing agent can significantly improve the early strength of concrete in winter construction, such ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F228/02C08F220/56C04B24/16C04B103/30
CPCC08F283/065C04B24/165C04B2103/302
Inventor 李化建赵有明易忠来黄法礼靳昊王振谢永江袁政成温浩李洪福刘辉
Owner RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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