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A kind of concrete slump retaining agent and preparation method thereof

A slump-preserving agent and concrete technology, which is applied in the field of concrete admixtures, can solve the problems of excessively large and fast slump loss of high-efficiency water-reducing agent, achieve obvious slump-preserving effect, and overcome excessive and fast slump loss. Effect

Active Publication Date: 2018-02-27
山西华凯伟业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a concrete slump-retaining agent and its preparation method. Adding the slump-retaining agent during the concrete construction process can overcome the shortcomings of high-efficiency water-reducing agents that the slump loss is too large and too fast, and the slump-retaining effect is obvious. It can maintain the fluidity of freshly mixed concrete and create favorable conditions for the use of commercial concrete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A concrete slump-retaining agent, the components and the mass parts of each component are as follows: 3 parts of methyl cellulose, 6 parts of polyacrylamide, 3 parts of calcium formate, 1.0 parts of sucrose, 4 parts of maleic anhydride, methyl olefin 0.5 parts of propyl polyoxyethylene ether, 8 parts of ethanolamine, 3 parts of formic acid, 0.5 parts of phosphoric acid, 5 parts of sodium methacrylate, 3 parts of sodium styrene sulfonate, 0.1 part of p-toluenesulfonic acid, 4.7 parts of methacrylic acid 1.0 parts of sodium gluconate, 5-15 parts of sodium hydroxide, and 15 parts of water.

[0019] The preparation method comprises the steps of:

[0020] 1) Mix monoethanolamine with formic acid and phosphoric acid and add maleic anhydride into the reaction kettle. Under the protection of nitrogen, heat up to 70°C at a heating rate of 0.5°C / min. Add methyl cellulose and continue to heat up to 100°C. The rate is 0.5°C / min, the constant temperature reaction is 1h, and the tem...

Embodiment 2

[0025] A concrete slump-retaining agent, the components and the mass parts of each component are as follows: 8 parts of methylcellulose, 10 parts of polyacrylamide, 9 parts of calcium formate, 3.2 parts of sucrose, 8 parts of maleic anhydride, methyl olefin 1.5 parts of propyl polyoxyethylene ether, 20 parts of ethanolamine, 7 parts of formic acid, 1.5 parts of phosphoric acid, 12 parts of sodium methacrylate, 8 parts of sodium styrene sulfonate, 0.5 parts of p-toluenesulfonic acid, 9.5 parts of methacrylic acid 2.2 parts of sodium gluconate, 15 parts of sodium hydroxide, and 20 parts of water.

[0026] The preparation method comprises the steps of:

[0027] 1) Mix monoethanolamine with formic acid and phosphoric acid and add maleic anhydride to the reaction kettle. Under the protection of nitrogen, heat up to 90°C with a heating rate of 2°C / min. Add methyl cellulose and continue to heat up to 120°C. The rate was 2°C / min, the constant temperature was reacted for 2 hours, and ...

Embodiment 3

[0032] A concrete slump-retaining agent, the components and the mass parts of each component are as follows: 4 parts of methylcellulose, 7 parts of polyacrylamide, 4 parts of calcium formate, 1.5 parts of sucrose, 5 parts of maleic anhydride, methyl olefin 0.8 parts of propyl polyoxyethylene ether, 12 parts of ethanolamine, 4 parts of formic acid, 0.8 parts of phosphoric acid, 7 parts of sodium methacrylate, 4 parts of sodium styrene sulfonate, 0.2 parts of p-toluenesulfonic acid, 5.5 parts of methacrylic acid 1.2 parts of sodium gluconate, 8 parts of sodium hydroxide, and 16 parts of water.

[0033] The preparation method comprises the steps of:

[0034] 1) Mix monoethanolamine with formic acid and phosphoric acid and add maleic anhydride to the reaction kettle. Under the protection of nitrogen, heat up to 80°C with a heating rate of 1°C / min. Add methyl cellulose and continue to heat up to 110°C. The rate was 1°C / min, the constant temperature was reacted for 1.5h, and the te...

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Abstract

The invention discloses a concrete slump retaining agent and a preparation method thereof. The concrete slump retaining agent comprises the following respective components in parts by weight: 3-8 parts of methylcellulose, 6-10 parts of polyacrylamide, 3-9 parts of calcium formate, 1.0-3.2 parts of saccharose, 4-8 parts of maleic anhydride, 0.5-1.5 parts of methyl allyl polyoxyethylene ether, 8-20 parts of monoethanolamine, 3-7 parts of formic acid, 0.5-1.5 parts of phosphoric acid, 5-12 parts of sodium methallyl sulfonate, 3-8 parts of sodium p-styrenesulfonate, 0.1-0.5 parts of p-toluenesulfonic acid, 4.7-9.5 parts of methacrylic acid, 1.0-2.2 parts of sodium gluconate, 5-15 parts of sodium hydroxide and 15-20 parts of water.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a concrete slump-retaining agent and a preparation method thereof. Background technique [0002] With the vigorous development of commercial concrete industry for construction, concrete admixtures in my country have been widely used in recent years, among which the Cai series sulfonate formaldehyde condensate type high-efficiency water reducer, melamine sulfonate formaldehyde condensate type high-efficiency water reducer Water agent, lignosulfonate water reducer, sugar calcium water reducer, etc. are used in large amounts. These superplasticizers endow the fresh concrete with good fluidity and strength, which can basically meet the construction needs for on-site mixing. But for ready-made concrete, there is a common problem of excessive slump loss. At present, there are many ways to solve the slump loss of concrete, and the following are common in constru...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/38
Inventor 阎国胜郭新岳马建强
Owner 山西华凯伟业科技有限公司
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