Polycarboxylate water-reducing agent with excellent slump retention, high water-reducing rate and improving concrete performance and preparation method thereof

A water-reducing agent and slump-preserving technology, applied in the field of polycarboxylate water-reducing agent and its preparation, can solve the problems of poor concrete strength and durability, low concrete fluidity, large cement consumption, etc. The effect of improving compaction and saving cement

Active Publication Date: 2017-02-01
JIANGXI PINGXIANG CITY LIANYOU BUILDING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these traditional water reducers such as polyester and polyether water reducers still have the disadvantages of high water-cement ratio, low concrete fluidity, low compactness, large amount of cement, and poor concrete strength and durability.

Method used

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  • Polycarboxylate water-reducing agent with excellent slump retention, high water-reducing rate and improving concrete performance and preparation method thereof
  • Polycarboxylate water-reducing agent with excellent slump retention, high water-reducing rate and improving concrete performance and preparation method thereof
  • Polycarboxylate water-reducing agent with excellent slump retention, high water-reducing rate and improving concrete performance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Raw material ratio:

[0022] 35 parts of methyl alkenyl polyoxyethylene ether, 15 parts of self-made additives, 15 parts of methacrylic acid, 2 parts of thioglycolic acid, 2 parts of caustic soda, 45 parts of water.

[0023] Homemade additives: 15% acrylic acid, 5% ammonium persulfate, 80% water.

[0024] The preparation steps include: (1) Weighing the raw materials of each component of the formula ratio; (2) heating water half of the formula ratio to 25-35°C, then adding methyl alkenyl polyoxyethylene ether and self-made auxiliary agents, and stirring While raising the temperature to 50°C; (3) After stirring and reacting the material in step (2) at 50°C for 1 hour, add dropwise to the reaction system a solution prepared by methacrylic acid, thioglycolic acid and water with the other half of the formula ratio, the above solution The dropping time is completed within 4 hours; (4) the reaction system of step (3) is maintained at 50°C for 1 hour, then cooled to 30°C and a...

Embodiment 2

[0026] Raw material ratio: 40 parts of methyl vinyl polyoxyethylene ether, 10 parts of self-made additives, 20 parts of methacrylic acid, 5 parts of thioglycolic acid, 5 parts of caustic soda, and 50 parts of water.

[0027] Preparation aids: 20% acrylic acid, 10% ammonium persulfate, 70% water.

[0028] The preparation method is the same as in Example 1.

Embodiment 3

[0030] 32 parts of methyl alkenyl polyoxyethylene ether, 20 parts of self-made additives, 20 parts of methacrylic acid, 4 parts of thioglycolic acid,

[0031] 2 parts of caustic soda, 55 parts of water.

[0032] Homemade additives: acrylic acid 16%, ammonium persulfate 8%, water 76%.

[0033] The preparation method is the same as in Example 1.

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PUM

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Abstract

The invention discloses a polycarboxylate superplasticizer with excellent slump retention, higher water-reducing rate and capable of perfecting concrete performance. The polycarboxylate superplasticizer is characterized by being prepared from the following components in parts by weight: 30-40 parts of methyl allyl polyethenoxy ether, 10-20 parts of self-made additives, 10-20 parts of methacrylic acid, 1-5 parts of mercaptoacetic acid, 1-5 parts of caustic soda flakes and 40-60 parts of water. The polycarboxylate superplasticizer disclosed by the invention has the advantages of reducing the water cement ratio, increasing the fluidity, perfecting the compaction rate of concrete, saving cement, perfecting the working performance of the concrete and improving the strength and durability of the concrete.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a polycarboxylic acid having excellent slump retention (from 260-255mm from the initial fluidity of cement paste to 60min), higher water reducing rate (30%), and improved concrete performance Water reducer and preparation method thereof. Background technique [0002] With the needs of construction development, the requirements for concrete technology and dosage are getting higher and higher, and the shrinkage and cracking rate of concrete must be strictly controlled during use to prevent potential safety hazards; in order to solve the above technical problems, the form of adding admixtures such as water reducers To overcome the problem of high shrinkage cracking rate caused by concrete slump loss; the development of water reducers has experienced lignosulfonate water reducers, naphthalene water reducers, polycarboxylate water reducers, etc. [0003] Polycarboxylate water reduce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/32C04B103/30
Inventor 吴剑东周玉军肖艳飞陈大伟周友斌周敬萍
Owner JIANGXI PINGXIANG CITY LIANYOU BUILDING MATERIAL
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