Concrete composite additive and preparation method and use thereof

A composite admixture and concrete technology, which is applied in the field of concrete, can solve the problems of hydration exotherm curve to be improved, and achieve the effects of engineering temperature control and crack prevention, simple production process, and reduction of internal and external temperature differences

Active Publication Date: 2011-06-22
GUANGDONG NO 2 HYDROPOWER ENGINEERING COMPANY LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the existing concrete admixture technology focuses on improving the strength, workability, and initial and final setting times of concrete by ad

Method used

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  • Concrete composite additive and preparation method and use thereof
  • Concrete composite additive and preparation method and use thereof
  • Concrete composite additive and preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 65kg naphthalene sulfonate formaldehyde condensate (NaSO 4 The content is less than 5wt%), 15kg calcium lignosulfonate, 10kg sodium gluconate, and 10kg sucrose were successively placed in a spiral stirring pot; stirred for 10-15 minutes to make the ingredients evenly distributed; using a packaging tape with a moisture-proof film inside Pack in time; obtain the powder product of the present invention.

Embodiment 2

[0034] 75kg naphthalene sulfonate formaldehyde condensate (NaSO 4 The content is less than 5wt%), 9kg calcium lignosulfonate, 8kg sodium gluconate, and 8kg sucrose are successively placed in a spiral stirring pot; stir for 10-15 minutes to make the ingredients evenly distributed; use a packaging tape with a moisture-proof film inside Pack in time; obtain the powder product of the present invention.

Embodiment 3

[0036] 70kg naphthalene sulfonate formaldehyde condensate (NaSO 4 content of less than 5wt%), 12kg calcium lignosulfonate, 8kg sodium gluconate, and 10kg sucrose were successively placed in a spiral stirring pot; stirred for 10-15 minutes to make the ingredients evenly distributed; using a packaging tape with a moisture-proof film inside Pack in time; obtain the powder product of the present invention.

[0037] The admixture of the present invention and its concrete performance test are carried out according to national standards and industry norms. The following tests used the concrete composite admixture powder product prepared in Example 3, naphthalene sulfonate superplasticizer (FDN), P.O 42.5 medium heat cement, secondary ordinary fly ash, river sand (medium sand), river sand pebble.

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Abstract

The invention relates to a concrete additive and discloses a concrete composite additive capable of optimizing a hydration heat release process of cement, which is prepared from the following raw materials in percentage by mass: 65 to 75 percent of naphthalene sulfonate-formaldehyde condensation product, 9 to 15 percent of lignosulfonic acid calcium salt, 8 to 10 percent of sodium gluconate and 8 to 10 percent of sucrose. When the additive is used, the hydration heat release of cement has the characteristic of two peaks and equal peak values. When other conditions are the same, the hydration heat half age of the cement mixed with the additive is three times longer than cement mixed with a naphthalene sulfonate water reducer and a concrete thermal-insulation temperature rise at a 7d age is reduced by about 7 DEG C; and the additive allows a cooling measure of introducing water to concrete to play a better cooling role, reduces the temperature rise peak value of the concrete by about 4 DEG C, ensures a remarkable cooling effect and has a great significance for the temperature control and cracking prevention of concrete. In addition, when the product provided by the invention is added, the pressure strength, working performance, durability and the like of concrete are all improved obviously.

Description

technical field [0001] The invention relates to the field of concrete, in particular to a concrete composite admixture. Background technique [0002] Under normal conditions, the hydration heat of ordinary silicate mesothermal cement can reach half of the final value within 1-2 days, which is called the half-value age of heat of hydration. The incorporation of superplasticizers, especially those with retarding properties, can change the exothermic curve of cement hydration and change the half-value age of heat of hydration. [0003] At present, the existing concrete admixture technology focuses on improving the strength, workability, and initial and final setting times of concrete by adding admixtures. The hydration heat release curve of the existing admixtures is basically a single peak, and the hydration release Thermal curves could be improved. Contents of the invention [0004] The purpose of the present invention is to overcome the shortcoming of prior art, provide ...

Claims

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Application Information

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IPC IPC(8): C04B24/22
CPCC04B40/0046
Inventor 谢祥明谢彦辉林建伟石爱军王光益梁跃先曾礼成杨波
Owner GUANGDONG NO 2 HYDROPOWER ENGINEERING COMPANY LTD
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