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Composite high-performance polycarboxylic acid water reducing agent and preparation method and application thereof

A technology of water reducing agent and polycarboxylic acid, applied in the field of concrete, can solve the problems of large hydration heat release, large fluidity loss, poor pumpability, etc., to alleviate the hydration concentration, reduce the peak heat release rate, improve The effect of pumping performance

Active Publication Date: 2019-10-25
GUANGZHOU INSTITUTE OF BUILDING SCIENCE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Based on this, it is necessary to provide a composite high-performance polycarboxylate water reducer for barite concrete, which can improve the fluidity of barite concrete, in view of the problems of large fluidity loss, poor pumpability, and large hydration heat release. Large loss of performance, poor pumpability, and large hydration heat release

Method used

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  • Composite high-performance polycarboxylic acid water reducing agent and preparation method and application thereof
  • Composite high-performance polycarboxylic acid water reducing agent and preparation method and application thereof
  • Composite high-performance polycarboxylic acid water reducing agent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A composite high-performance polycarboxylate water reducer is prepared from the following raw materials in parts by weight:

[0044]

[0045]Among them, the water-reducing polycarboxylate superplasticizer mother liquor is prepared by the following method: 320 parts of methallyl polyoxyethylene ether are dissolved in water as substrate solution I; 40 parts of acrylic acid are dissolved in water to obtain a solution A; Dissolve 2.0 parts of mercaptopropionic acid and 0.8 parts of vitamin C in water to obtain solution B; at 25°C, add hydrogen peroxide to substrate solution I, and after stirring for 10 minutes, add solution A and solution B dropwise at the same time, drop The addition process lasts for 2 hours, after the dropwise addition is completed, keep warm for 1 to 2 hours, add alkali to adjust the pH to 6 to 7, and the product is obtained; When it is 0.2%, the water reduction rate is ≥30%;

[0046] The viscosity-reducing polycarboxylate superplasticizer mother li...

Embodiment 2

[0053] A composite high-performance polycarboxylate water reducer is prepared from the following raw materials in parts by weight:

[0054]

[0055] Among them, the preparation method of water-reducing polycarboxylate superplasticizer mother liquor, viscosity-reducing polycarboxylate superplasticizer mother liquor, slow-release polycarboxylate superplasticizer mother liquor and hydration heat inhibitor is the same as that of the corresponding raw materials in Example 1. The preparation method is the same.

[0056] The composite high-performance polycarboxylate water reducer for barite concrete is prepared by the following method:

[0057] Add water-reducing polycarboxylate superplasticizer mother liquor, viscosity-reducing polycarboxylate superplasticizer mother liquor and slow-release polycarboxylate superplasticizer mother liquor into the compound tank, stir well, and then add hydration heat inhibitor agent, sodium gluconate, guar gum, sodium rosinate liquid air-entraini...

Embodiment 3

[0060] A composite high-performance polycarboxylate water reducer is prepared from the following raw materials in parts by weight:

[0061]

[0062] Among them, the preparation method of water-reducing polycarboxylate superplasticizer mother liquor, viscosity-reducing polycarboxylate superplasticizer mother liquor, slow-release polycarboxylate superplasticizer mother liquor and hydration heat inhibitor is the same as that of the corresponding raw materials in Example 1. The preparation method is the same.

[0063] The composite high-performance polycarboxylate water reducer for barite concrete is prepared by the following method:

[0064] Add water-reducing polycarboxylate superplasticizer mother liquor, viscosity-reducing polycarboxylate superplasticizer mother liquor and slow-release polycarboxylate superplasticizer mother liquor into the compound tank, stir well, and then add hydration heat inhibitor agent, glucose, xanthan gum, triterpene saponin liquid air-entraining ...

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Abstract

The invention provides a composite high-performance polycarboxylic acid water reducing agent and a preparation method and application thereof, and relates to the technical field of concrete. The composite high-performance polycarboxylic water reducing agent is prepared from the following raw materials in parts by weight: 15-20 parts of a water-reduced polycarboxylic acid water reducing agent mother liquor, 10-15 parts of a viscosity reduction polycarboxylic acid water reducing agent mother liquor, 20-30 parts of a slow-release polycarboxylic acid water reducing agent mother liquor, 10-15 partsof a hydration heat inhibitor, 2-5 parts of a retarder, 0-0.1 part of a consistency regulator, 0-0.06 part of an air entraining agent and 0-0.05 part of a defoamer. The composite high-performance polycarboxylic acid water reducing agent is applied to barite concrete, the fluidity, pumping performance and stability of the barite concrete can be effectively improved, the heat release rate of hydration is slowed down, and the wall is prevented from cracking.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a composite high-performance polycarboxylate water reducer and its preparation method and application. Background technique [0002] In places such as scientific research institutes, medical units, and nuclear power plants, equipment such as particle liners and cyclotrons are equipped. These equipments will generate harmful rays and neutron flows during operation. Therefore, when building structures in these places, it is necessary to Concrete with anti-radiation properties is used. Barite has a high density and can effectively absorb radiation and neutron flow, avoiding the harm of radiation to the human body to a certain extent. Barite concrete is widely used in such places. [0003] The existing barite concrete is prone to some problems during use, such as: [0004] Barite concrete has high water absorption and high brittleness. During the mixing process, the barite aggrega...

Claims

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Application Information

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IPC IPC(8): C04B24/42C04B24/34C04B24/32C04B28/02C04B103/30
CPCC04B28/02C04B40/0039C04B2103/302C04B2201/20C04B2201/50C04B24/42C04B24/20C04B24/383C04B22/0013C04B24/32C04B24/04C04B24/16C04B24/06C04B22/068C04B24/283C04B24/045C04B24/38C04B24/34C04B24/10C04B24/00C04B14/368
Inventor 张金龙陈小龙钟开红孙申美邵强吴英哲
Owner GUANGZHOU INSTITUTE OF BUILDING SCIENCE CO LTD
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