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Alite-sulphoaluminate cement concrete crack-resistant admixture

A technology of sulphoaluminate cement and concrete, which is applied in the field of construction admixtures, can solve the problems of concrete durability decline, temperature difference cracks, concrete temperature rise, etc., and achieve the effect of good adaptability and excellent crack resistance

Inactive Publication Date: 2019-01-29
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The performance of Alite-sulfoaluminate cement is better than that of ordinary sulfoaluminate cement, but the admixtures currently on the market for ordinary sulfoaluminate cement concrete only focus on retardation and super early strength, and do not take into account the current situation. After the retarder in the concrete is consumed, the cement will release heat sharply, and the internal temperature of the concrete will rise sharply, causing temperature difference cracks, which will seriously reduce the durability of the concrete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] An anti-cracking admixture for Alite-sulfoaluminate cement concrete, by weight percentage, includes the following components:

[0053] Ground Quartz Sand 24%

[0054] Polycarboxylate water-reducing mother liquor 24%

[0055] Sodium Tetraborate 18%

[0056] Redispersible latex powder 8%

[0057] Polyvinyl alcohol 4%

[0058] Aluminum hydroxide 6%

[0059] Mannitol 9%

[0060] Calcium formate 7%

[0061] The average particle size of the ground quartz sand is 2.4um; the polycarboxylate water-reducing mother liquor is a maleic anhydride polycarboxylate water-reducer; the polycarboxylate water-reducing mother liquor has a solid content of 40%; The redispersible latex powder is ethylene-vinyl acetate copolymer.

[0062]A preparation process for an anti-cracking admixture for Alite-sulfoaluminate cement concrete, carried out as follows:

[0063] Step 1, weighing or preparing each component according to the proportion;

[0064] Step 2, fully mix the finely ground quart...

Embodiment 2

[0067] An anti-cracking admixture for Alite-sulfoaluminate cement concrete, by weight percentage, includes the following components:

[0068] Ground Quartz Sand 26%

[0069] Polycarboxylate water-reducing mother liquor 22%

[0070] Sodium Tetraborate 18%

[0071] Redispersible latex powder 10%

[0072] Polyvinyl alcohol 5%

[0073] Aluminum hydroxide 5%

[0074] Mannitol 8%

[0075] Calcium formate 6%

[0076] The average particle size of the ground quartz sand is 2.4um; the polycarboxylate water-reducing mother liquor is an acrylic polycarboxylate water-reducer; the solid content of the polycarboxylate water-reducing mother liquor is 40%; The redispersed latex powder is an acrylate-styrene copolymer.

[0077] A preparation process for an anti-cracking admixture for Alite-sulfoaluminate cement concrete, carried out as follows:

[0078] Step 1, weighing or preparing each component according to the proportion;

[0079] Step 2, fully mix the finely ground quartz sand, po...

Embodiment 3

[0082] An anti-cracking admixture for Alite-sulfoaluminate cement concrete, by weight percentage, includes the following components:

[0083] Ground Quartz Sand 26%

[0084] Polycarboxylate water-reducing mother liquor 26%

[0085] Sodium Tetraborate 16%

[0086] Redispersible latex powder 9%

[0087] Polyvinyl alcohol 4%

[0088] Aluminum hydroxide 6%

[0089] Mannitol 8%

[0090] Calcium formate 5%

[0091] The average particle diameter of the ground quartz sand is 2.4um; the polycarboxylate water-reducing mother liquor is a methacrylic acid polycarboxylate water-reducer; the polycarboxylate water-reducing mother liquor has a solid content of 40%; The redispersible latex powder is an acrylate-styrene copolymer.

[0092] A preparation process for an anti-cracking admixture for Alite-sulfoaluminate cement concrete, carried out as follows:

[0093] Step 1, weighing or preparing each component according to the proportion;

[0094] Step 2, fully mix the finely ground qua...

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Abstract

The present invention provides an Alite-sulphoaluminate cement concrete crack-resistant admixture. In percentage by weight, the Alite-sulphoaluminate cement concrete crack-resistant admixture mainly comprises the following components: 20-30% of ground quartz sand; 20-30% of polycarboxylic acid water reducing mother liquor, 10-20% of sodium tetraborate, 4-10% of redispersible latex power, 2-8% of polyvinyl alcohol, 3-7% of aluminum hydroxide, 5-10% of mannitol, and 2-7% of calcium formate. The crack-resistant admixture has the prominent advantages of high initial slump and no loss of slump for4h under the construction condition of 35 DEG C; no effect on early and late strength of the Alite-sulphoaluminate cement concrete; good adaptability to cement; excellent crack resistance and no concrete cracks due to concentrated heat release of Alite-sulphoaluminate cement concrete. The crack-resistant admixture is also applicable to sulphoaluminate cement-based materials.

Description

technical field [0001] The invention relates to the technical field of admixtures for construction, in particular to an anti-cracking admixture of Alite-sulfoaluminate cement concrete. Background technique [0002] Alite-sulfoaluminate cement is a kind of sulfoaluminate cement containing tricalcium silicate. Compared with ordinary sulfoaluminate cement, its setting time is shorter (it can reach initial setting in 10 minutes), and its early strength Higher (1d strength can reach 50MPa), and the later strength will continue to increase, and the anti-corrosion and impermeability performance is better, so it can be used as a reliable repair / protection cement. [0003] The patent titled "a pumping agent for sulphoaluminate cement concrete (Chinese patent application publication number: CN103588416A)" discloses a pumping agent for sulphoaluminate cement concrete. This invention only discusses the retarding effect of the pumping agent and the influence of the pumping agent on the ...

Claims

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Application Information

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IPC IPC(8): C04B24/26
CPCC04B40/0039C04B14/06C04B22/0013C04B24/2623C04B22/06C04B24/04C04B24/02C04B2103/302C04B24/26
Inventor 张德成柳超奇徐晓磊
Owner UNIV OF JINAN
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