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Retarder for sulphate aluminum cement and use method thereof

A technology of sulphoaluminate cement and retarder, which is applied in the field of cement admixtures, can solve inconsistencies, where water molecules are easy to penetrate into the interior of the wrapping film where the wrapping film is thin, the borax retarding effect is unstable, and the borax retarding effect is not stable. Unstable coagulation and other problems, to achieve the effect of prolonging the initial setting and final setting time, low price, and increasing fluidity

Inactive Publication Date: 2017-05-31
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the actual shape of cement particles is very irregular, and the solubility and dissolution rate of surfaces with different curvature radii are different, resulting in different thicknesses of the calcium borate coating film formed on the surface of different parts. Water molecules easily penetrate into the coating film in places where the coating film is thin. Rapid hydration of clinker minerals in the film, the formation of hydration products AFm and AFt will cause volume expansion of the solid phase, resulting in crystallization pressure in the film, resulting in the rupture of the calcium borate coating film, resulting in unstable retarding effect of borax
Therefore, the retarding effect of borax is very unstable, and it is easy to cause engineering accidents

Method used

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  • Retarder for sulphate aluminum cement and use method thereof
  • Retarder for sulphate aluminum cement and use method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A retarder suitable for sulphoaluminate cement, which is prepared from the following raw materials in parts by weight: 70 parts of polymer emulsion, 10 parts of chloromethylisothiazolinone, 2 parts of film forming agent, and water reducer 1 part and polyethylene glycol 15 parts.

[0029] Said polymer emulsion is a silicone-modified acrylic emulsion with a solid content of 47-49%.

[0030] As mentioned, the film-forming agent is a non-ionic polyurethane emulsion with a solid content of 54%.

[0031] As mentioned above, the water reducer is sodium lignosulfonate powder, the sodium lignosulfonate content is >45%, and the sieve residue is ≤4%.

[0032] Described, polyethylene glycol is polyethylene glycol 300.

[0033] A method for using a retarder suitable for sulphoaluminate cement, comprising the following steps:

[0034] 1) Add sodium silicate to water, mix well, adjust the pH to 8, heat to keep the temperature at 40°C, and obtain an alkali solution;

[0035] 2) Wei...

Embodiment 2

[0043] A retarder suitable for sulphoaluminate cement is prepared from the following raw materials in parts by weight: 50 parts of polymer emulsion, 15 parts of chloromethylisothiazolinone, 6 parts of film forming agent, and water reducer 8 parts and polyethylene glycol 10 parts.

[0044] Described, polyethylene glycol is polyethylene glycol 600.

[0045] A method for using a retarder suitable for sulphoaluminate cement, comprising the following steps:

[0046] 1) Add sodium silicate to water, mix well, adjust the pH to 9, heat to keep the temperature at 35°C, and obtain an alkaline solution;

[0047] 2) Weighing the polymer emulsion, chloromethylisothiazolinone, film-forming agent, water reducer and polyethylene glycol by weight, and mixing to obtain a retarder;

[0048] 3) Add the retarder to the alkali solution and stir for 25 minutes to obtain the primary product;

[0049] 4) Mix the first product with mixing water evenly, then add defoamer and starch, mix well, and the...

Embodiment 3

[0056] A retarder suitable for sulphoaluminate cement is prepared from the following raw materials in parts by weight: 30 parts of polymer emulsion, 25 parts of chloromethylisothiazolinone, 10 parts of film forming agent, and water reducer 15 parts and 5 parts polyethylene glycol.

[0057] Described, polyethylene glycol is polyethylene glycol 1000.

[0058] A method for using a retarder suitable for sulphoaluminate cement, comprising the following steps:

[0059] 1) Add sodium silicate to water, mix well, adjust the pH to 10, heat to keep the temperature at 30°C, and obtain an alkaline solution;

[0060] 2) Weighing the polymer emulsion, chloromethylisothiazolinone, film-forming agent, water reducer and polyethylene glycol by weight, and mixing to obtain a retarder;

[0061] 3) Add the retarder to the alkali solution and stir for 30 minutes to obtain the primary product;

[0062] 4) Mix the first product with mixing water evenly, then add defoamer and starch, mix well, and ...

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Abstract

The invention discloses a retarder for sulphate aluminum cement and a use method thereof. The retarder is prepared from the following raw materials in parts by weight: 30-70 parts of polymer emulsion, 10-25 parts of metylchloro isothiazolinone, 2-10 parts of film-forming agent, 1-15 parts of water reducer and 5-15 parts of polyethylene glycol. The invention also discloses the use method for the retarder. The retarder disclosed by the invention can effectively reduce the coagulation speed of the sulphate aluminum cement; the initial setting time and the final setting time both can be prolonged for above 30min; the fluidity of the cement slurry can be obviously promoted; the fluidity of cement paste can be increased by above 15%. The retarder disclosed by the invention has no any adverse effect to the development of the cement strength, is low in cost, is high in performance stability and is easily stored and transported.

Description

technical field [0001] The invention relates to a setting retarder suitable for sulphoaluminate cement and a using method thereof, belonging to the field of cement admixtures. Background technique [0002] Sulphoaluminate cement has a wide range of applications. Due to the characteristics of the cement clinker mineral itself, sulphoaluminate cement hydrates quickly and releases a lot of heat during hydration. When the local temperature in the cement-based material is too high At that time, the construction work brought great difficulties and uneasy factors. [0003] Cement retarder is an admixture that can delay the setting time of concrete without significantly affecting its later performance. For sulphoaluminate cement, boric acid is often used in engineering to adjust its setting speed. Boric acid has a strong active effect on cement particles and new phases of hydrates, and can form a dense calcium borate coating layer, which is adsorbed on the surface of cement partic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42C04B28/06C04B103/22
CPCC04B40/0028C04B40/0039C04B2103/22C04B2201/52C04B24/42C04B24/005C04B24/282C04B24/18C04B24/32C04B22/08C04B22/002C04B24/38C04B24/085C04B28/06C04B24/124
Inventor 芦令超孙科科宫晨琛
Owner UNIV OF JINAN
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