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Super-slowly coagulant adaptive to variaty concrete water reducers and prepn. thereof

A technology of super retarder and ethylene polyamine alkyl phosphonic acid, which is applied in the field of concrete super retarder, can solve problems such as incompatibility, and achieve the effects of reducing slump loss, small dosage and good adaptability

Inactive Publication Date: 2006-09-20
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical route of the present invention is: in view of the characteristics and main problems of the current ordinary super retarder, and the incompatibility existing when used in combination with different types of concrete water reducing agents, use the excellent phosphate in the inorganic retarder Chelation, retarding effect, organic retarder efficient retarding effect, optimize the combination of organic and inorganic, choose vinylamine alkyl phosphonate or vinylamine alkylphosphonic acid as the super retarding component, the composite can be compared with different Super retarder suitable for varieties of superplasticizers

Method used

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  • Super-slowly coagulant adaptive to variaty concrete water reducers and prepn. thereof
  • Super-slowly coagulant adaptive to variaty concrete water reducers and prepn. thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh the required components as shown in Table 1, then put them together in a stirring tank and stir slowly for 3-10 minutes, and then stop for about 20 minutes to prepare a super retarder.

Embodiment 2～5

[0026] The preparation method is the same as in Example 1, and the weight ratio of each component is shown in Table 1.

[0027] Example

Ethylenediamine-tetramethylphosphonic acid

Aminotrimethylphosphonic acid

Phosphobutane tricarboxylic acid

water

1

0

220

60

720

2

200

0

50

750

3

350

0

50

600

4

100

0

50

850

5

50

0

150

800

[0028] The weights of ethylenediamine-tetramethylphosphonic acid and aminotrimethylphosphonic acid listed in Table 1 refer to their solid content, unit: g.

[0029] The main application examples are shown in Tables 2, 3 and 4 respectively.

[0030] For the concrete mix ratio of C40 strength grade, when the super retarder is 0.4% of the cement content and used in combination with polycarboxylate concrete water reducing agent, the setting time of concrete is related...

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Abstract

This invention relates to the field of concrete super-retarding reagents that are compatible with all kinds of concrete water reducers. The super-retarding reagent in this invention has a mass-fraction composition as follows: 6~35% ethylene polyamine alkyl phosphonic acid or its salt, 5~15% phosphonobutane tricarboxylic acid and 50~90% water. The super-retarding reagent is compatible with different kinds of water reducers and cement, and can greatly reduce the loss of concrete mixture slump. The super-retarding reagent performs extraordinary retarding activities, and concrete solidification time can be adjusted to 3~150 hours by modulating product composition and dosage according to actual engineering demand.

Description

technical field [0001] The invention relates to the field of a super retarder for concrete which can be adapted to various types of concrete water reducing agents. Background technique [0002] Concrete super retarder technology is a new development direction of today's concrete technology, and is widely used in the construction of large-volume concrete projects such as underground and dams. Compared with ordinary concrete retarder, it is an admixture that can adjust the setting time of concrete arbitrarily for a long time without destroying the performance of concrete and not affecting the later strength of concrete. At present, the concrete retarders used at home and abroad are divided into two categories, inorganic and organic. The inorganic type mainly includes borax, zinc oxide, phosphate and metaphosphate, etc. The organic type mainly includes lignosulfonate, hydroxycarboxylic acid (salt), sugars and carbohydrates, polyols and their derivatives, etc. However, these r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/12C04B24/04
Inventor 蒋正武
Owner TONGJI UNIV
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