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Concrete surface retarder as well as preparation method and application thereof

A concrete surface and retarder technology, applied in the field of cement admixtures, can solve problems such as poor high-temperature hydration inhibition effect, poor performance of surface retarders, and weakened temperature adaptability, so as to broaden the scope of use and improve high-temperature performance Performance, the effect of improving adaptability

Inactive Publication Date: 2020-12-15
福建西建新材料有限公司 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Prefabricated components are often cured by high-temperature steam, and common surface retarders do not perform well in high-temperature environments, which weakens their temperature adaptability. The reason is that the retarder components have an inhibitory effect on the high-temperature hydration of cementitious materials poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The concrete preparation steps of present embodiment surface retarder are as follows:

[0032] 1. Preparation of polymer retarder: Add 10kg of maleic acid, 15kg of acrylic acid, and 24kg of 2-acrylamide-2-methylpropanesulfonic acid into 50kg of deionized water, dissolve, stir evenly, pass nitrogen gas for 15min, and heat up to 60 ℃, add 1 kg of potassium persulfate, and react for 2 hours to prepare a polymer retarder with a total solid content of 50%.

[0033] 2. Mix liquid raw materials: Weigh 730kg of deionized water, 5kg of borax, 50kg of 2-hydroxyphosphonoacetic acid, and 100kg of polymer retarder in a 1t stirred tank, and stir for 5min.

[0034] 3. Dissolve solid raw materials: Weigh 100kg of sodium gluconate and 5kg of calcium nitrite into the mixed solution obtained in step 2, and stir for 30 minutes until the solution is transparent and clear.

[0035] 4. Dissolved solid thickener: Weigh 10kg of cornstarch, slowly add to the solution obtained in step 3, and sti...

Embodiment 2

[0039] The concrete preparation steps of present embodiment surface retarder are as follows:

[0040] 1. Preparation of polymer retarder: Add 9kg of maleic acid, 10kg of acrylic acid, and 30kg of 2-acrylamide-2-methylpropanesulfonic acid into 50kg of deionized water, dissolve, stir evenly, pass nitrogen gas for 15min, and heat up to At 60°C, add 1 kg of potassium persulfate and react for 2 hours to prepare a polymer retarder with a total solid content of 50%.

[0041] 2. Mix liquid raw materials: Weigh 730kg of deionized water, 5kg of borax, 50kg of aminotrimethylene phosphonic acid, and 100kg of polymer retarder in a 1t stirred tank, and stir for 5 minutes.

[0042] 3. Dissolving solid raw materials: Weigh 100kg of sucrose and 5kg of calcium nitrite into the mixed solution obtained in step 2, and stir for 30 minutes until the solution is transparent and clear.

[0043] 4. Dissolved solid thickener: Weigh 10kg of cornstarch, slowly add to the solution obtained in step 3, and ...

Embodiment 3

[0047] The concrete preparation steps of present embodiment surface retarder are as follows:

[0048] 1. Preparation of polymer retarder: Add 5kg of maleic acid, 10kg of acrylic acid, and 34kg of 2-acrylamide-2-methylpropanesulfonic acid into 50kg of deionized water, dissolve, stir evenly, pass nitrogen gas for 15min, and heat up to At 60°C, add 1 kg of potassium persulfate and react for 2 hours to prepare a polymer retarder with a total solid content of 50%.

[0049] 2. Mix liquid raw materials: Weigh 730kg of deionized water, 5kg of borax, 50kg of ethylenediaminetetramethylenephosphonic acid, and 100kg of polymer retarder acid, place them in a 1t stirring tank, and stir for 5min.

[0050] 3. Dissolving solid raw materials: Weigh 100kg of sucrose and 5kg of sodium oxalate into the mixed solution obtained in step 2, and stir for 30 minutes until the solution is transparent and clear.

[0051] 4. Dissolved solid thickener: Weigh 10kg of xanthan gum, slowly add to the solution ...

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Abstract

The invention provides a concrete surface retarder, and belongs to the technical field of concrete. The concrete retarder is prepared from the following components, by mass: 15%-25% of a composite retarder, 0.5%-1% of a thickening agent, 0.1%-1% of a corrosion inhibitor and 0.3%-2% of a preservative, wherein the solid content of the surface retarder is 19-29%. The invention also provides a preparation method of the retarder and application of the retarder in precast concrete components. By adopting a mode of compounding various retarders, the adaptability to cement is improved, and the application range of the surface retarder is widened; the surface retarder disclosed by the invention contains a high-temperature-resistant retarder, is good in high-temperature performance, is suitable forprefabricated parts subjected to natural curing or high-temperature steam curing, and is relatively wide in use temperature range; according to the invention, the types and dosages of the raw materials are optimized, the corrosion of the concrete template is fully considered, and the corrosion inhibitor is added, so that the negative effect of the surface retarder is effectively reduced; the surface retarder disclosed by the invention is low in raw material cost, not easy to volatilize, environment-friendly and suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of cement admixtures, in particular to a concrete surface retarder and its preparation method and application. Background technique [0002] Concrete prefabricated components are building components prefabricated in factories with concrete as the basic material, including beams, slabs, columns and building decoration accessories. In recent years, various new construction concepts such as construction industrialization, energy saving and emission reduction, quality and safety, and ecological environmental protection have brought development opportunities for prefabricated components. In the process of urbanization, a large number of infrastructure constructions, large-scale affordable housing urgently need standardization, rapid construction and high Quality construction provides a wide space for prefabricated components. [0003] The contact parts between prefabricated components and cast-in-place need to b...

Claims

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Application Information

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IPC IPC(8): C04B41/65
CPCC04B41/5006C04B41/5009C04B41/65C04B41/4849C04B41/46C04B41/4803C04B41/4539
Inventor 罗杰王军陈景刘其彬汪金文周辉吕振华刘明曾超王福涛
Owner 福建西建新材料有限公司
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