Concrete slump remaining agent and preparation method thereof

A slump-preserving agent and concrete technology, applied in the field of concrete admixtures, can solve the problems of excessive and fast slump loss of high-efficiency water-reducing agent, achieve obvious slump-preserving effect, maintain fluidity, and overcome excessive slump loss. too big effect

Inactive Publication Date: 2016-01-20
李康
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 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 agent slump loss 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

[0022] A concrete slump-retaining agent, the components and the mass parts of each component are as follows: 1 part of methyl cellulose, 5 parts of polyacrylamide, 2 parts of calcium formate, 1.0 parts of sucrose, 5 parts of maleic anhydride, methanol polyoxygen 0.2 parts of vinyl ether, 10 parts of monoethanolamine, 3 parts of formic acid, 0.5 parts of phosphoric acid, 6 parts of sodium methacrylate, 5.2 parts of methacrylic acid, 1.0 parts of sodium gluconate, and 10 parts of water.

[0023] The preparation method comprises the steps of:

[0024] 1) After neutralizing monoethanolamine, formic acid and phosphoric acid, add maleic anhydride to the reactor, under the protection of nitrogen, heat up to 70°C, add methyl cellulose and continue to heat up to 95°C, react at constant temperature for 2.5h, cool down to get Product A;

[0025] 2) Add methanol polyoxyethylene ether, polyacryloyl, and methacrylic acid into the reactor, stir, heat to 110°C, react for 2.5 hours, and cool ...

Embodiment 2

[0029] A concrete slump-retaining agent, the components and the mass parts of each component are as follows: 5 parts of methyl cellulose, 10 parts of polyacrylamide, 5 parts of calcium formate, 2.8 parts of sucrose, 10 parts of maleic anhydride, methanol polyoxygen 1.0 parts of vinyl ether, 18 parts of monoethanolamine, 8 parts of formic acid, 1.2 parts of phosphoric acid, 11 parts of sodium methacrylate, 8.8 parts of methacrylic acid, 2.5 parts of sodium gluconate, and 15 parts of water.

[0030] The preparation method comprises the steps of:

[0031] 1) After neutralizing monoethanolamine, formic acid and phosphoric acid, add maleic anhydride to the reactor, under the protection of nitrogen, heat up to 70°C, add methyl cellulose and continue to heat up to 95°C, react at constant temperature for 2.5h, cool down to get Product A;

[0032] 2) Add methanol polyoxyethylene ether, polyacryloyl, and methacrylic acid into the reactor, stir, heat to 110°C, react for 2.5 hours, and c...

Embodiment 3

[0036] A concrete slump-retaining agent, the components and the mass parts of each component are preferably as follows: 4 parts of methyl cellulose, 8 parts of polyacrylamide, 4.5 parts of calcium formate, 2.2 parts of sucrose, 8 parts of maleic anhydride, methanol poly 0.8 parts of oxyethylene ether, 16 parts of monoethanolamine, 6 parts of formic acid, 1.0 part of phosphoric acid, 10 parts of sodium methacrylate, 7.8 parts of methacrylic acid, 2.0 parts of sodium gluconate, and 14 parts of water.

[0037] The preparation method comprises the steps of:

[0038] 1) After neutralizing monoethanolamine, formic acid and phosphoric acid, add maleic anhydride to the reactor, under the protection of nitrogen, heat up to 70°C, add methyl cellulose and continue to heat up to 95°C, react at constant temperature for 2.5h, cool down to get Product A;

[0039] 2) Add methanol polyoxyethylene ether, polyacryloyl, and methacrylic acid into the reactor, stir, heat to 110°C, react for 2.5 ho...

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PUM

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Abstract

The invention discloses a concrete slump remaining agent and a preparation method thereof. The concrete slump remaining agent is prepared from, by mass, 1-5 parts of methyl cellulose, 5-10 parts of polyacrylamide, 2-5 parts of calcium formate, 1.0-2.8 parts of saccharose, 5-10 parts of maleic anhydride, 0.2-1.0 part of methyl alcohol polyoxyethylene ether, 10-18 parts of monoethanolamine, 3-8 parts of formic acid, 0.5-1.2 parts of phosphoric acid, 6-11 parts of sodium methallyl sulfonate, 5.2-8.8 parts of methacrylic acid, 1.0-2.5 parts of sodium gluconate, and 10-15 parts of water. The slump remaining effect of the slump remaining agent is obvious, when the mass of the slum remaining agent doped in cement is 0.05%-0.08% of the mass of the cement, no slump loss is caused within 60 min, the maximum slump loss is only 10.8% in the ninetieth minute, flowablity of green concrete can be kept, and favorable conditions are created for use of commercial concrete.

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 the 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 fresh concrete with good fluidity and strength, which can basically meet the construction needs for on-site mixing. But for commercial concrete, there is a common problem of excessive slump loss. [0003] At present, there are many ways to solve the slump loss of concrete, and the following are common...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/38
Inventor 李康
Owner 李康
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