Low-temperature-resistant liquid alkali-free accelerator and preparation method thereof

An accelerator and anti-low temperature technology, applied in the field of concrete admixtures, can solve the problems of easy crystallization, injury and stimulation of construction personnel, etc., and achieve the effects of improving product stability, solving easy freezing and high production efficiency

Inactive Publication Date: 2019-12-27
天津冶建特种材料有限公司 +2
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] But, the shortcoming of the preparation method of this antifreeze type non-alkali quick-setting agent is: the antifreeze component-soluble starch that it adopts is adsorbed on the cement particle surface, can produce certain slow-setting effect, is unfavorable for the fast hydration of cement, Poor adaptability may occur when some cement is encountered at the same time
[0009] But, the shortcoming of this antifreeze type non-alkali liquid quick-setting agent and preparation method thereof is: it has adopted alkaline earth nitrate as antifreeze component, although improved the antifreeze of product to a certain extent, also introduced alkali Metal ions increase the alkali content of the product, which does not meet the core technical idea of ​​low alkali content and high durability of the alkali-free accelerator
[0011] But the shortcoming of this antifreeze non-alkali liquid quick-setting agent is: it has adopted methanol as antifreeze component, although can effectively reduce system freezing point, but does not have any helpful effect to strength growth and setting time, in addition methanol has stronger volatilization Sexuality, easy to irritate the eyes and skin of contact persons
[0013] But the shortcoming of this core masterbatch that is used for liquid alkali-free quick-setting agent and preparation method thereof is: it has adopted one or more in sodium sulfate, magnesium sulfate, urea as antifreeze component, and sodium sulfate, magnesium sulfate As an alkali metal sulfate, it does not have frost resistance, and it is easy to crystallize and precipitate at low temperature. At the same time, it also increases the alkali content of the product and reduces the durability of concrete.
Although urea can lower the freezing point, the country has strict requirements on the release limit of ammonia, and the volatile gas produced by urea will also cause harm to construction workers
[0014] In addition, the above-mentioned several existing technologies also have a common shortcoming: that is, the materials introduced are all components with only a single antifreeze performance, which cannot improve the main component of the quick-setting agent Al. 3+ The solubility of ions will instead increase the proportion of solute in the solution system, which may increase the solution saturation of the accelerator system and reduce the stability

Method used

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  • Low-temperature-resistant liquid alkali-free accelerator and preparation method thereof
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preparation example Construction

[0052] figure 1 It is a schematic flow chart of the preparation method of the low temperature resistant liquid alkali-free accelerator in the embodiment of the present invention. like figure 1 As shown, the preparation method of the anti-low temperature type liquid alkali-free accelerator in the embodiment of the present invention comprises the following steps:

[0053] Step 101, mixing aluminum sulfate, alcohol amine, stabilizer and water, and heating to 60-80°C.

[0054] Step 102, adding reinforcing agent and modified nanomaterials in sequence while controlling the temperature to remain constant.

[0055] Step 103, keep warm for 0.5-3.5 hours (h), and then lower the temperature to below 30°C.

[0056] Step 104, adding a pH regulator and stirring evenly, and then the reaction ends.

[0057] Through the above-mentioned steps 101-104, the above-mentioned anti-low temperature type liquid alkali-free accelerator can be prepared.

specific Embodiment 1

[0060] In this specific example one, the preparation method of anti-low temperature type liquid alkali-free quick-setting agent comprises the following steps:

[0061] Step 11, mix 50 grams (g) of aluminum sulfate, 10 g of alcohol amine, 0.05 g of stabilizer and 29.95 g of water, and heat up to 80°C.

[0062] In step 12, add 4 g of reinforcing agent and 1 g of modified nanomaterial in sequence and keep the temperature constant.

[0063] Step 13, keep warm for 3.5 hours, and then lower the temperature to below 30°C.

[0064] Step 14, add 1g of pH adjuster and stir evenly, and then the reaction ends.

[0065] Through the above-mentioned steps 11-14, the above-mentioned anti-low temperature type liquid alkali-free accelerator can be prepared.

specific Embodiment 2

[0067] In this specific example two, the preparation method of anti-low temperature type liquid alkali-free accelerator comprises the following steps:

[0068] Step 21, mix 40g of aluminum sulfate, 5g of alcohol amine, 0.01g of stabilizer and 45.99g of water, and heat up to 60°C.

[0069] In step 22, add 6 g of reinforcing agent and 2 g of modified nanomaterials in sequence and keep the temperature constant.

[0070] Step 23, keep warm for 2.5 hours, and then lower the temperature to below 30°C.

[0071] Step 24, add 1g of pH adjuster and stir evenly, and then the reaction ends.

[0072] Through the above-mentioned steps 21-24, the above-mentioned anti-low temperature type liquid alkali-free accelerator can be prepared.

[0073] The anti-low temperature type alkali-free accelerator provided in the technical solution of the present invention can significantly reduce the freezing point of the alkali-free accelerator solution, thereby preventing the accelerator from freezing or...

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Abstract

The invention provides a low-temperature-resistant liquid alkali-free accelerator and a preparation method thereof. The accelerator is composed of the following components in percentage by mass: 40-50% of aluminum sulfate, 5-10% of alcohol amine, 0.01-0.05% of a stabilizing agent, 4-6% of a reinforcing agent, 1-2% of a modified nano material, 1-2% of a pH conditioning agent, and 29.95-48.99% of water. By applying the accelerator, the defect that the conventional alkali-free setting accelerator is easy to freeze at low temperature can be effectively overcome, and the product stability, the concrete mechanical property and the durability are remarkably improved.

Description

technical field [0001] The application relates to the technical field of concrete admixtures, in particular to a low-temperature resistant liquid alkali-free accelerator and a preparation method thereof. Background technique [0002] Accelerator is a kind of admixture mixed into concrete that can make concrete set and harden rapidly. Accelerators can be divided into powder and liquid according to their form, and can be divided into alkali and non-alkali according to their characteristics. After being mixed with cement, the quick-setting agent can promote the rapid hydration and coagulation of cement, and form sufficient strength in a short time to achieve the purpose of rapid repair or rapid coagulation of concrete in shafts. It is indispensable in the shotcrete construction method. additives. [0003] With the continuous improvement of people's attention to environmental friendliness and concrete durability, the alkali-free accelerator has no alkali, no chlorine, no irrit...

Claims

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Application Information

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IPC IPC(8): C04B24/38C04B103/12
CPCC04B40/0039C04B2103/12C04B22/148C04B24/122C04B24/383C04B22/126C04B22/142C04B22/08C04B14/06C04B14/303C04B24/04C04B24/06
Inventor 刘伟班克成徐伟杰吴志刚王雪敏郭诚李家
Owner 天津冶建特种材料有限公司
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