Curing agent in concrete and preparation method and use method thereof

An internal and curing agent technology for concrete, applied in the field of concrete internal curing agent, can solve problems such as insufficient concrete maintenance, and achieve the effects of super water absorption and water retention capacity, smooth surface, and less admixture

Active Publication Date: 2010-10-06
广西红墙新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the above-mentioned technical problems, the applicant of the present invention aimed at various technical problems caused by insufficient concrete curing in actual projects, as well as the limitations in the application of existing concrete curing agents, and developed a compound that can be used in the preparation process of concrete. Curing agent directly mixed, this curing agent is called "concrete internal curing agent"

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0069] The preparation method of the concrete internal curing agent of the present invention is: weigh each component according to the required weight ratio, first mix alcohol with water at 40-60°C, and then graft lignosulfonate, hydroxyl starch, and starch with methacrylic acid Hydroxyethyl ester, methyl cellulose and polyacrylamide are dissolved in alcohol aqueous solution and cooled to room temperature to obtain this product.

[0070] The concrete mixed with this internal curing agent can maintain a long-term internal wet state, the volume stability of the concrete structure is good, the internal cementitious material can be fully hydrated, and the strength growth is stable. Moreover, in the long-term state, since the four kinds of superabsorbent substances exist on the inner surface of capillary pores, when the concrete is soaked in water, the water-absorbent substances re-absorb a large amount of free water, which also helps to improve the impermeability of concrete.

[0...

Embodiment 1

[0075] Concrete internal curing agent is prepared by hydroxystarch 100, starch grafted hydroxyethyl methacrylate 20, methyl cellulose 5, polyacrylamide 5, sodium lignosulfonate 20, alcohol 2, water 900.

[0076] Add this internal curing agent (the internal curing agent dosage is 0.2% of cement weight), its slump of the prepared concrete is 16cm, the bleeding rate is 0, the effective water retention rate is 87%, and the initial setting time is 4: 20, the final setting time is 6:10, and the compressive strength ratio is 92%.

Embodiment 2

[0078] Concrete internal curing agent is prepared by 100% hydroxy starch, 40% starch grafted hydroxyethyl methacrylate, 20% methyl cellulose, 20% polyacrylamide, 50% sodium lignosulfonate, 80% alcohol, and 800% water.

[0079] Add this internal curing agent (the internal curing agent dosage is 0.1% of the cement weight), the slump of the prepared concrete is 14cm, the bleeding rate is 0, the effective water retention rate is 97%, and the initial setting time is 6: 00, the final setting time is 8:30, and the compressive strength ratio is 93%.

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Abstract

The invention discloses a curing agent in concrete, which comprises the following components: hydroxyl starch, starch grafted hydroxyethyl methacrylate, methyl cellulose, polyacrylamide, lignin sulfonate and aqua is preferred, wherein alcohol can be also added in as co-solvent. The curing agent in concrete has small admixture amount, is convenient to use, has very strong water absorbing and conserving capability in the concrete and blocks the water in the concrete from being evaporated externally; and even if the concrete is not cured by the water (moisture) from the outside environment after being cast, gelled material can have good hydration reaction, thereby greatly improving the strength of the concrete, reducing dryness and shrinkage, and preventing cracking.

Description

technical field [0001] The invention relates to a concrete internal curing agent, its preparation method and application method. Background technique [0002] After the concrete structure is poured, good wet curing is an important condition to ensure its strength establishment and normal growth. In addition, good wet curing of concrete is also an important measure to prevent the structure from shrinking, cracking and leakage hazards. According to the relevant national standards and regulations, the concrete mixture needs at least 7 days of wet curing after pouring (the concrete mixed with fly ash, slag powder and other admixtures needs 14 days of wet curing, and the concrete mixed with expansion agent needs wet curing. It should be at least 14 days), in order to ensure the normal growth of concrete strength and effectively prevent the structure from drying and cracking under normal design and construction conditions. However, because our country is in a period of rapid con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/38
CPCC04B2111/34C04B40/0039
Inventor 赵利华黄海燕韩强
Owner 广西红墙新材料有限公司
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