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Concrete early strength agent and preparation method thereof

An early-strength agent and concrete technology, which is applied in the field of additives for concrete construction and its preparation, can solve the problems of increasing equipment investment and operating costs, increasing energy consumption, etc., to avoid steam curing procedures, reduce energy consumption, shorten The effect of steaming time

Active Publication Date: 2016-12-21
CHONGQING SANSHENG IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the existing technology, the common method is to use steam curing to promote the early strength development of concrete, but this method increases equipment investment and operating costs, and increases energy consumption

Method used

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  • Concrete early strength agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 10g of methacrylic acid, 1.94g of maleimide, 20.34g of 2-methyl-2-octadecyl acrylate and 51.7g of deionized water were stirred evenly to obtain a monomer solution; 3.448g of ferrous ammonium sulfate dissolved in 38.8 g of deionized water and stirred uniformly to obtain an initiator solution; 0.862 g of n-dodecyl mercaptan and 12.9 g of deionized water were uniformly stirred to obtain a chain transfer agent solution.

[0031] 120g of methyl alkenyl polyoxyethylene ether with a relative molecular weight of 1200, 20.1g of methacrylic acid and 155.1g of deionized water were mixed and stirred and heated to 40°C, and the prepared initiator solution was added to the reaction system within 3 hours , after stirring for 5 minutes, add the prepared monomer solution and chain transfer agent solution to the reaction system dropwise at a constant speed, and continue to keep warm for 1 hour after dropping, and the temperature of the reaction system is controlled at 40°C during the drop...

Embodiment 2

[0033] Stir 7.2g of acrylic acid, 1.42g of acrylamide, 16.95g of 2-methyl-2-octadecyl acrylate and 84g of deionized water to obtain a monomer solution; dissolve 1.4g of sodium bisulfite in 58.8g of deionized Stir uniformly in water to obtain an initiator solution; stir 0.84 g of mercaptopropionic acid and 25.2 g of deionized water uniformly to obtain a chain transfer agent solution.

[0034] Mix and stir 240g of methyl alkenyl polyoxyethylene ether with a relative molecular weight of 2400, 14.4g of acrylic acid and 252g of deionized water and heat up to 38°C, add the prepared initiator solution into the reaction system within 2.5h, stir After 5 minutes, add the prepared monomer solution and chain transfer agent solution to the reaction system dropwise at a constant speed, and continue to keep warm for 0.5h after dropping, and the temperature of the reaction system is controlled at 38°C during the dropping and keeping; add potassium hydroxide aqueous solution Adjust the pH valu...

Embodiment 3

[0036] Stir 8.2g of maleic anhydride, 3.55g of acrylamide, 10.17g of 2-methyl-2-octadecyl acrylate and 65.5g of deionized water to obtain a monomer solution; dissolve 5.24g of concentrated sulfuric acid in 52.4g of Stir uniformly in deionized water to obtain an initiator solution; stir 0.218 g of mercaptoacetic acid and 13.1 g of deionized water uniformly to obtain a chain transfer agent solution.

[0037] 180g of methyl alkenyl polyoxyethylene ether with a relative molecular weight of 1800, 16.3g of maleic anhydride and 196.4g of deionized water were mixed and stirred and heated to 42°C, and the prepared initiator solution was added to the reaction within 2.5h system, after stirring for 5 minutes, add the prepared monomer solution and chain transfer agent solution to the reaction system dropwise at a uniform speed, and continue to keep warm for 1.5 hours after dropping, and the temperature of the reaction system is controlled at 42°C during the dropping and keeping; Sodium ox...

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Abstract

The invention relates to a concrete early strength agent and a preparation method thereof and aims to provide a concrete early strength agent which has water-reducing and early strength functions and can rapidly raise early strength of concrete after being doped and a preparation method thereof. The concrete early strength agent is obtained by free radical polymerization of VPEG, any one ingredient selected from a group consisting of methacrylic acid, acrylic acid and maleic anhydride, acrylamide or maleimide, and octadecyl methacrylate. The prepared concrete early strength agent has high water-reducing rate and excellent early strength performance. When solid volume discount is 0.2%, the water-reducing rate can reach 30% and above, 1d compressive strength rate of concrete reaches 240% and above, and 3d compressive strength rate reaches 220% and above. During production of a prefabricated part in winter, steam curing time can be shortened. During production in summer, the steam-curing process can be avoided. Thus, energy consumption is greatly reduced, and production cost of the prefabricated part is lowered.

Description

technical field [0001] The invention relates to an additive for concrete construction and a preparation method thereof, in particular to a concrete early strength agent and a preparation method thereof. Background technique [0002] For a long time, my country's construction industry, especially the housing industry, has been in the extensive development stage, and the contribution rate of science and technology is less than 30%, which is far below the level of developed countries and 40% of my country's agriculture. In recent years, in order to promote the sustainable development of the construction industry, effectively change the mode of economic growth, and improve the quality of projects, the construction industry has attached great importance to promoting the modernization of the construction industry. To realize the modernization of the construction industry and "build a house like a car", a large number of building components will be transformed from on-site casting ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/40C08F220/18C08F220/56C08F222/06C08F2/38C04B24/26C04B103/12
CPCC04B24/2694C04B2103/12C08F2/38C08F283/065C08F220/06C08F222/06
Inventor 李志坤胡向博陈云松姚彬
Owner CHONGQING SANSHENG IND CO LTD
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