Composite retarding and water reducing agent and preparation method thereof

A retarding water reducing agent and modification technology are applied in the field of composite retarding water reducing agent and its preparation to achieve the effects of good retardation, strength enhancement and water reduction rate improvement.

Active Publication Date: 2020-08-18
南京友西科技集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still room for improvement in terms of comprehensive performance such as setting retardation and water reduction.

Method used

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  • Composite retarding and water reducing agent and preparation method thereof
  • Composite retarding and water reducing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A composite retarding water reducer, in parts by weight, comprising the following components:

[0043] 100 parts of sodium lignosulfonate, 20 parts of fly ash, 10 parts of calcium silicate, 10 parts of sodium gluconate, 5 parts of silica gel powder, 10 parts of carboxymethyl cellulose (molecular weight 6400), 10 parts of sulfonated humic acid , 80 parts of modified polycarboxylates, 3 parts of citric acid;

[0044] The preparation method of described sulfonated humic acid is:

[0045] Take humic acid (HA), add distilled water, then add potassium hydroxide to dissolve, add NaHSO twice the mass of humic acid 3 The sulfonating agent is reacted at 40°C. After the reaction, the pH value is adjusted to 3, filtered, dried and pulverized to obtain sulfonated humic acid.

[0046] The preparation method of described modified polycarboxylate is:

[0047] Take 1 part of 2-acrylamido-2-methylpropanesulfonic acid and add 15 times of water, add 3 parts of maleic anhydride, add 0.05...

Embodiment 2

[0052] A composite retarding water reducer, in parts by weight, comprising the following components:

[0053]200 parts of sodium lignosulfonate, 10 parts of fly ash, 20 parts of calcium silicate, 5 parts of sodium gluconate, 10 parts of silica gel powder, 15 parts of carboxymethyl cellulose (molecular weight 6000), 5 parts of sulfonated humic acid , 50 parts of modified polycarboxylates, 8 parts of citric acid;

[0054] The preparation method of described sulfonated humic acid is:

[0055] Take humic acid (HA), add distilled water, then add potassium hydroxide to dissolve, add Na 2 SO 3 The sulfonating agent reacts at 60°C. After the reaction, adjust the pH value to 5, filter with suction, dry, and pulverize to obtain sulfonated humic acid.

[0056] The preparation method of described modified polycarboxylate is:

[0057] Take 1 part of 2-acrylamido-2-methylpropanesulfonic acid and add 30 times of water, add 5 parts of maleic anhydride, add 0.08% (with 2-acrylamido-2-methy...

Embodiment 3

[0062] A composite retarding water reducer, in parts by weight, comprising the following components:

[0063] 50 parts of sodium lignosulfonate, 50 parts of fly ash, 50 parts of calcium silicate, 10 parts of sodium gluconate, 20 parts of silica gel powder, 20 parts of carboxymethyl cellulose (molecular weight 7000), 1 part of sulfonated humic acid , 10 parts of modified polycarboxylate, 1 part of citric acid;

[0064] The preparation method of described sulfonated humic acid is:

[0065] Take humic acid (HA), add distilled water, then add potassium hydroxide to dissolve, add NaHSO which is 3 times the mass of humic acid 3 The sulfonating agent is reacted at 50°C. After the reaction, the pH value is adjusted to 4, filtered, dried and pulverized to obtain sulfonated humic acid.

[0066] The preparation method of described modified polycarboxylate is:

[0067] Take 1 part of 2-acrylamido-2-methylpropanesulfonic acid and add 20 times of water, add 4 parts of maleic anhydride, a...

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Abstract

The invention belongs to the field of concrete admixtures, and particularly relates to a composite retarding and water reducing agent and a preparation method thereof. The composite retarding and water reducing agent comprises the following components: sodium lignin sulfonate, fly ash, calcium silicate, sodium gluconate, silica gel powder, carboxymethyl cellulose, sulfonated humic acid, modified polycarboxylate and citric acid. The preparation method is simple, has good retarding and water reducing effects, is simple, and is beneficial to popularization and application.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, and in particular relates to a composite retarding water reducer and a preparation method thereof. Background technique [0002] Concrete admixtures, referred to as admixtures for short, refer to substances that are added to improve the performance of concrete before or during the mixing of concrete. Because admixtures can effectively improve the performance of concrete and have good economic benefits, more and more attention has been paid to the application of admixtures in engineering, and they have become an indispensable material in concrete. [0003] High-rise building pumping concrete and long-distance transportation of concrete, in order to maintain its good working performance, the concrete needs to have a large flow state and a retarder; when large-volume concrete is constructed in summer, in order to prevent the heat of hydration from being too concentrated and avoid the temperature s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/38C04B103/30C04B103/22
CPCC04B40/0039C04B2103/22C04B2103/302C04B24/18C04B18/08C04B22/00C04B24/16C04B24/06C04B24/28C04B14/062C04B24/383
Inventor 缪海燕王晓芳黄雪盛思仲鹿立云
Owner 南京友西科技集团股份有限公司
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