Liquid accelerator for sprayed concrete and preparation thereof

A technology of shotcrete and accelerator

Inactive Publication Date: 2009-07-08
JIANGSU SUBOTE MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the above patents use aluminum salts such as amorphous aluminum hydroxide or soluble aluminum hydroxide, the cost is high, and the dosage is high when used, generally accounting for 6% to 12% of the cement mass, and prone to precipitation, crystallization, etc. problem, not conducive to long-term storage and use

Method used

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  • Liquid accelerator for sprayed concrete and preparation thereof
  • Liquid accelerator for sprayed concrete and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0024] A quick-setting admixture for shotcrete, in weight:

[0025] Aluminum sulfate (Al 2 O 3 15.8%) 50%

[0026] Diethanolamine 6%

[0027] Sodium fluoride 5%

[0028] Phosphoric acid 1.5%

[0029] Attapulgite 0.5%

[0030] Water 37%

[0031] The preparation method of the liquid accelerator for sprayed concrete is specifically as follows:

[0032] 1) Weigh the said weight ratio of sodium fluoride and add it to water to dissolve it. This process needs to be realized at 40-100°C; then diethanolamine is added; finally aluminum sulfate is added and stirred until the system becomes a clear solution or micro Suspension, this process needs to maintain the above temperature in the previous step.

[0033] 2) Add phosphoric acid and stir well.

[0034] 3) Add the attapulgite diagram and stir evenly, and lower the temperature to obtain the required liquid accelerator for sprayed concrete.

preparation Embodiment 2

[0036] Aluminum sulfate (Al 2 O 3 15.8%) 54%

[0037] Diethanolamine 6%

[0038] Sodium fluoride 5%

[0039] Phosphoric acid 1%

[0040] Formic acid 0.5%

[0041] Attapulgite 0.8%

[0042] Water 32.7%

[0043] The preparation method is similar to the embodiment. Phosphoric acid and formic acid can be pre-mixed before adding, or can be added separately and sequentially.

preparation Embodiment 3

[0045] Aluminum sulfate (Al 2 O 3 15.6%) 60%

[0046] Diethanolamine 4%

[0047] Sodium fluoride 4%

[0048] Phosphoric acid 1.5%

[0049] Sepiolite magnesium silicate 0.5%

[0050] Water 30%

[0051] The preparation method is the same as in Example 1.

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Abstract

The invention relates to a liquid accelerator for shotcrete and a method for preparing the same. The liquid accelerator is prepared from the following components in percentage by weight: 25 to 70 percent of aluminum sulfate, 0 to 8 percent of metal fluoride, 1 to 10 percent of amine substance, 0.5 to 7 percent of pH regulator, 0.01 to 1 percent of thickening agent, and the balance being water. The method for preparing the liquid accelerator comprises the following steps: firstly, dissolving the fluoride into the water; secondly, adding the amine substance to the mixture and heating the solution to a temperature of between 40 and 80 DEG C; thirdly, adding the aluminum sulfate to the solution to perform heat preservation reaction until the solution becomes a uniform liquid; and fourthly, adding the pH regulator and the thickening agent to the uniform liquid and stirring the mixture evenly to finally obtain a uniform liquid substance which is the liquid accelerator for the shotcrete. The liquid accelerator is free from corrosion, has no penetrating odor, has good storage stability so that the phenomena of deposition, crystallization and the like do not appear after the storage of more than 6 months at a temperature of between 0 and 35 DEG C, and does not influence the effect in practice. Using the liquid accelerator with lower mixing proportion (5 to 8 percent), cement can be initially set within 4 minutes and finally set within 10 minutes, and the strength of cement mortar within one day is more than 10 MPa and the storage rate of the strength within 28 days is more than 100 percent.

Description

Technical field [0001] The invention relates to a liquid accelerator for wet spraying cement-based materials, in particular to a liquid accelerator for spraying concrete and a preparation method thereof. Background technique [0002] Shotcrete has many advantages in construction and rock support, and has become a very important and necessary measure in modern underground engineering. Especially the development of wet mix shotcrete technology has greatly expanded the scope of application of shotcrete in underground engineering. The most important function of the liquid accelerator for sprayed concrete is to accelerate the setting of the concrete mixture and improve the early strength, which can increase the thickness of the spray layer and shorten the time for spraying the next layer. [0003] Traditional shotcrete accelerators generally include alkali metal aluminates, carbonates, silicates and other substances, and the content is relatively high, generally accounting for 4% to 8...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/12C04B22/14C04B22/12
CPCC04B2111/00146C04B2103/12C04B2111/00086C04B2111/00456C04B2103/61C04B40/0046
Inventor 缪昌文刘加平周伟玲张建纲
Owner JIANGSU SUBOTE MATERIAL
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