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Nuclear-power concrete air-entraining polycarboxylic acid additive

A technology of polyester-type polycarboxylic acid and polycarboxylic acid, which is applied in the field of concrete, can solve the problems of inability to meet the construction requirements of nuclear power concrete and large loss of concrete slump, achieve good compatibility, delay setting time, and reduce hydration hot effect

Active Publication Date: 2013-10-23
CHINA NUCLEAR CONSTR CONCRETE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The above data are obtained after the initial test. The products of the four admixtures all have a phenomenon of large loss of concrete slump, which cannot meet the construction requirements of nuclear power concrete.

Method used

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  • Nuclear-power concrete air-entraining polycarboxylic acid additive
  • Nuclear-power concrete air-entraining polycarboxylic acid additive
  • Nuclear-power concrete air-entraining polycarboxylic acid additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A concrete air-entraining polycarboxylate admixture for nuclear power, comprising the following substances:

[0037]

[0038] The above-mentioned raw materials are uniformly mixed to obtain the air-entraining polycarboxylic acid admixture for nuclear power concrete of the present invention.

[0039] The above-mentioned ZWL‐II air-entraining agent is made by mixing nonylphenol polyoxyethylene ether and sodium lauryl sulfate at a weight ratio of 1:1.

[0040] The above-mentioned ZWL‐PC‐II polycarboxylate water reducer is formed by mixing polyester polycarboxylic acid and polyether polycarboxylic acid in a weight ratio of 1:0.3.

[0041] Described polyester polycarboxylate adopts following method to prepare from:

[0042] (1) Dehydrate and esterify 0.97mol methacrylic acid and 1mol methoxypolyethylene glycol at 85°C for 3.5 hours under the action of catalytic sulfuric acid. 0.35%;

[0043] (2) Copolymerize 3.6 mol of methacrylic acid with the product obtained in step...

Embodiment 2

[0046] A concrete air-entraining polycarboxylate admixture for nuclear power, comprising the following substances:

[0047]

[0048]

[0049]The above-mentioned raw materials are uniformly mixed to obtain the air-entraining polycarboxylic acid admixture for nuclear power concrete of the present invention.

[0050] The above-mentioned ZWL‐II air-entraining agent is made by mixing nonylphenol polyoxyethylene ether and sodium lauryl sulfate at a weight ratio of 1:1.

[0051] The above-mentioned ZWL‐PC‐II polycarboxylate water reducer is formed by mixing polyester polycarboxylic acid and polyether polycarboxylic acid in a weight ratio of 1:0.3.

[0052] Described polyester polycarboxylate adopts following method to prepare from:

[0053] (1) Dehydrate and esterify 1 mol of methacrylic acid and 1 mol of methoxypolyethylene glycol at 80°C for 3 hours under the action of catalytic sulfuric acid, and the mass of sulfuric acid added accounts for 0.5% of the mass of methoxypolyet...

Embodiment 3

[0057] A concrete air-entraining polycarboxylate admixture for nuclear power, comprising the following substances:

[0058]

[0059] The above-mentioned raw materials are uniformly mixed to obtain the air-entraining polycarboxylic acid admixture for nuclear power concrete of the present invention.

[0060] The above-mentioned ZWL‐II air-entraining agent is made by mixing nonylphenol polyoxyethylene ether and sodium lauryl sulfate at a weight ratio of 1:3.

[0061] The above-mentioned ZWL‐PC‐II polycarboxylate water reducer is formed by mixing polyester polycarboxylic acid and polyether polycarboxylic acid in a weight ratio of 1:0.3.

[0062] Described polyester polycarboxylate adopts following method to prepare from:

[0063] (1) Dehydrate and esterify 0.98mol of acrylic acid and 1mol of methoxypolyethylene glycol under the action of catalyst sulfuric acid at 90°C for 4 hours. The mass of sulfuric acid added accounts for 1% of the mass of methoxypolyethylene glycol ;

[...

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Abstract

The invention relates to a nuclear-power concrete air-entraining polycarboxylic acid additive which comprises the following substances: by weight, 60-80% of a ZWL-PC-II polycarboxylic acid water reducer, 1-8% of gluconic acid sodium salt, 0.5-3% of white sugar, 0.01-0.3% of a polyether antifoaming agent, 0.1-1% of a ZWL-II air-entrainer, 0-0.5% of Welan gum, and the balance water. According to the invention, Welan gum is used as a plastic retaining agent to control bleeding of concrete and sedimentation of cobblestone; By binary complex formulation of two retarders, namely sodium gluconate and white sugar, coagulation time of concrete is delayed, and early-stage heat of hydration of concrete is reduced; as the ZWL-II air-entrainer which fits with the ZWL-PC-II polycarboxylic acid water reducer is adopted, tiny, uniform and stable steam bubbles are introduced such that slump and gas content loss result of concrete completely meet construction requirements of nuclear-power concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete, and in particular relates to an air-entraining polycarboxylic acid admixture for nuclear power concrete. Background technique [0002] Air-entraining agent is a kind of admixture of cement concrete. By reducing the three-phase interfacial tension and improving the mechanical strength and toughness of the air bubble film, the air brought in during the mixing process forms tiny and stable air bubbles that are evenly distributed in the concrete. Improve the frost resistance, impermeability and erosion resistance of concrete. Air-entraining agents are mainly used to improve the frost resistance of hydraulic concrete. At present, my country only has clear requirements for mixing air-entraining agents in hydraulic and port concrete design regulations. With the development of concrete technology, especially the introduction of foreign construction equipment and foreign engineering companies entering t...

Claims

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Application Information

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IPC IPC(8): C04B24/38C04B24/26C04B103/30
Inventor 杜增强韩红良苗琛宋永良卢德华胡德华高铀周敬山
Owner CHINA NUCLEAR CONSTR CONCRETE
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