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A kind of concrete slump retaining agent and preparation method thereof

A slump-retaining agent and concrete technology, which are applied in the field of additives for concrete construction and their preparation, can solve the problems of long setting time, quality accident, seriousness, etc., and achieve the effects of good slump retention performance, energy saving and excellent slump retention performance.

Active Publication Date: 2018-09-14
贵阳三圣特种建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In engineering applications, due to various reasons, the loss of concrete slump and expansion is too fast, and the fluidity and constructability of concrete on site cannot meet the construction needs, causing great difficulties in the construction process.
When encountering this situation, construction sites and concrete mixing plants generally control the loss of concrete fluidity by adjusting the concrete mix ratio, increasing the amount of admixture or increasing the amount of retarder in the admixture, and these measures will cause new Quality problems, such as concrete segregation and bleeding caused by over-mixing of admixtures, excessive setting time caused by over-mixing of retarders, and even more serious quality accidents

Method used

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  • A kind of concrete slump retaining agent and preparation method thereof
  • A kind of concrete slump retaining agent and preparation method thereof
  • A kind of concrete slump retaining agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 7.2g of acrylic acid, 23.2g of hydroxyethyl acrylate, 13g of hydroxypropyl acrylate and 87.2g of deionized water were stirred uniformly to obtain a monomer solution; 5.812g of concentrated sulfuric acid was dissolved in 52.3g of deionized water and stirred uniformly to obtain an initiator solution; 0.145 g of mercaptopropionic acid, 0.52 g of ascorbic acid and 13.1 g of deionized water were stirred evenly to obtain a chain transfer agent solution.

[0032] 240g of methyl alkenyl polyoxyethylene ether with a relative molecular weight of 2400, 7.2g of acrylic acid and 283.4g of deionized water were mixed and stirred and heated to 30°C, then the prepared initiator solution was added to the reaction system, and after stirring for 5 minutes, Add the prepared monomer solution and chain transfer agent solution to the reaction system dropwise at a constant speed within 3 hours, and continue to keep warm for 1 hour after dropping, and keep the temperature of the reaction system a...

Embodiment 2

[0034] 14.7g of maleic anhydride, 11.6g of hydroxyethyl acrylate, 19.5g of hydroxypropyl acrylate and 54.2g of deionized water were stirred uniformly to obtain a monomer solution; 1.8g of hydrogen peroxide was dissolved in 27.1g of deionized water and stirred uniformly to obtain an initiator Solution: Stir 0.9g mercaptoethanol, 0.18g ascorbic acid and 14g deionized water evenly to obtain a chain transfer agent solution.

[0035] Mix and stir 120g of methyl alkenyl polyoxyethylene ether with a relative molecular weight of 1200, 14.7g of maleic anhydride and 176g of deionized water and heat up to 28°C, add the prepared initiator solution into the reaction system, and stir for 5 minutes , add the prepared monomer solution and chain transfer agent solution to the reaction system dropwise at a constant speed within 2.5 hours, continue to keep warm for 0.5h after dropping, keep the temperature of the reaction system at 28°C during the dropping and keeping warm; add potassium hydroxid...

Embodiment 3

[0037] 14.5g of fumaric acid, 17.4g of hydroxyethyl acrylate, 15.6g of hydroxypropyl acrylate and 72.6g of deionized water were stirred uniformly to obtain a monomer solution; 1.21g of sodium persulfate was dissolved in 43.6g of deionized water and stirred uniformly to obtain Initiator solution: 0.12g of mercaptoacetic acid, 0.122g of mercaptopropionic acid, 0.121g of ascorbic acid and 10.9g of deionized water were evenly stirred to obtain a chain transfer agent solution.

[0038] Mix and stir 180g of methyl alkenyl polyoxyethylene ether with a relative molecular weight of 1800, 14.5g of fumaric acid and 236g of deionized water and heat up to 32°C, add the prepared initiator solution into the reaction system, and stir for 5 minutes , add the prepared monomer solution and chain transfer agent solution to the reaction system dropwise at a constant speed within 3 hours, continue to keep warm for 1.5 hours after dropping, and keep the temperature of the reaction system at 32°C duri...

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Abstract

The invention relates to a concrete slump retaining agent and a preparation method thereof, and aims to provide the concrete slump retaining agent and the preparation method thereof, wherein the concrete slump retaining agent can greatly improve the slump retaining performance of concrete and prolong the concrete operationable time in a premise of not affecting normal setting and hardening of the concrete. The concrete slump retaining agent is obtained by free radical polymerization of arbitrary one of methyl alkenyl polyoxyethylene ether, methacrylic acid, acrylic acid, fumaric acid and maleic anhydride, hydroxyethyl acrylate and hydroxypropyl acrylate. The concrete slump retaining agent prepared by the formula has good slump retaining performance, when the equivalent solid doping amount is 0.2%, the water reducing rate can reach more than or equal to 20%, the slump of concrete doped with the concrete slump retaining agent has no loss in 3 h, and the slump retaining performance is excellent; the reaction temperature of the slump retaining agent prepared by the method is close to room temperature, heating is not required during production in summer, the heat released by the system itself can ensure successful completion of the reaction, and the energy is saved.

Description

technical field [0001] The invention relates to an additive for concrete construction and a preparation method thereof, in particular to a concrete slump retaining agent and a preparation method thereof. Background technique [0002] In engineering applications, due to various reasons, the loss of concrete slump and expansion is too fast, and the fluidity and constructability of concrete on site cannot meet the construction needs, causing great difficulties in the construction process. When encountering this situation, construction sites and concrete mixing plants generally control the loss of concrete fluidity by adjusting the concrete mix ratio, increasing the amount of admixture or increasing the amount of retarder in the admixture, and these measures will cause new Quality problems, such as concrete segregation and bleeding caused by over-mixing of admixtures, excessive setting time due to over-mixing of retarders, and even more serious quality accidents. Contents of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/28C08F222/06C08F222/02C04B24/26
CPCC04B24/2694C04B2103/308C08F283/065C08F220/281
Inventor 李志坤胡向博姚彬陈云松
Owner 贵阳三圣特种建材有限公司