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Alkali-free accelerator as well as preparation method and application thereof

A technology of accelerators and accelerators, applied in the field of accelerators, can solve the problems of not being able to store for a long time, the performance of accelerators is ineffective, and not stable enough, it is not easy to achieve later strength, improve strength, and good stability. Effect

Active Publication Date: 2022-07-29
GUANGZHOU JIANSHENG BUILDING MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the use of traditional quick-setting agents still occupies a dominant position in sprayed concrete construction. Although this kind of quick-setting agent can accelerate the setting of concrete mixture and improve the early strength , but the aluminum sulfate in the accelerator is in a highly supersaturated state, not stable enough to store for a long time, easy to crystallize and precipitate, and easily cause the performance of the accelerator to fail

Method used

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  • Alkali-free accelerator as well as preparation method and application thereof
  • Alkali-free accelerator as well as preparation method and application thereof
  • Alkali-free accelerator as well as preparation method and application thereof

Examples

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Embodiment 1

[0039] The present embodiment discloses an alkali-free setting accelerator, which is composed of the following raw materials:

[0040] Aluminum sulfate; Magnesium fluorosilicate; Phosphoric acid; Sodium sulfate; Alcohol amine; Coagulant; Xanthan gum; Water.

[0041] The present embodiment also discloses a preparation method of an alkali-free setting accelerator, comprising the following steps:

[0042] (1) Add water, sodium sulfate and coagulant according to the amounts in Table 2, and stir evenly at a rotating speed of 180 r / min to obtain a premix;

[0043] (2) Then the reaction kettle was heated to 48°C, and magnesium fluorosilicate, aluminum sulfate and xanthan gum were added to the premix (the dosage is shown in Table 2), and the stirring was carried out at a speed of 150 r / min. Continue to stir for 15min;

[0044] (3) The reaction kettle was heated to 65°C, and phosphoric acid and alkanolamine were added dropwise to the reaction kettle (see Table 2 for the dosage), and ...

Embodiment 2

[0047] The difference from Example 1 is:

[0048] In step (2), the reaction kettle was heated to 52°C, magnesium fluorosilicate, aluminum sulfate and xanthan gum were added to the premix material (see Table 2 for the dosage), and the mixture was stirred at a speed of 150 r / min while adding. Continue to stir for 25min after completion; in step (3), the reaction kettle is heated to 70°C, phosphoric acid and alcohol amine are dropped into the reaction kettle, and stirring is added while dropping at a speed of 100r / min, and the temperature is kept for 45min after dropping.

[0049] The consumption of each raw material in the embodiment 1-4 is shown in Table 2, and the unit is kg.

[0050] Table 2

[0051]

[0052]

Embodiment 5

[0054] The difference from Example 4 is that triethanolamine and diethanolamine are mixed in a mass ratio of 7:15.

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Abstract

The invention relates to the field of accelerators, and particularly discloses an alkali-free accelerator which is prepared from the following raw materials in parts by mass: 360-380 parts of aluminum sulfate; 30 to 50 parts of magnesium fluosilicate; 15-20 parts of phosphoric acid; 65-80 parts of sodium sulfate; 38 to 46 parts of alcohol amine; 55 to 70 parts of a coagulation accelerator; 1-5 parts of xanthan gum; and 180 to 220 parts of water. The invention also discloses a preparation method of the alkali-free accelerator, which comprises the following steps: (1) adding water, sodium sulfate and the accelerator according to the formula to obtain a premix; (2) heating the reaction kettle to 48-52 DEG C, and adding magnesium fluosilicate, aluminum sulfate and xanthan gum into the premix; (3) heating the reaction kettle to 65-70 DEG C, and dropwise adding phosphoric acid and alkylol amine into the reaction kettle; and (4) cooling to normal temperature to obtain the alkali-free accelerator. The alkali-free accelerator provided by the invention can be applied to concrete. The accelerator has the effect of improving the stability of the accelerator.

Description

technical field [0001] The present application relates to the field of accelerators, and more particularly, to an alkali-free accelerator and its preparation method and application. Background technique [0002] Accelerators refer to admixtures that are added to concrete to make concrete set and harden rapidly. The traditional powdery quick-setting admixture accounts for 3.0%-8.0% of the cement in the concrete, which can make the concrete initially set within 5 minutes and finally set within 12 minutes, so as to achieve the purpose of emergency repair or rapid setting of concrete in wells. An indispensable additive in concrete construction methods. Their function is to accelerate the hydration and hardening of cement and form sufficient strength in a very short time to ensure the requirements of special construction. [0003] At present, the use of traditional accelerators in shotcrete construction still occupies a dominant position. Although this accelerator can accelerat...

Claims

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Application Information

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IPC IPC(8): C04B24/38C04B22/12C04B22/14C04B24/12C04B103/12
CPCC04B40/0039C04B22/126C04B24/38C04B22/148C04B24/122C04B24/383C04B2103/12C04B22/165C04B22/147C04B22/002C04B22/085
Inventor 卢伟雄
Owner GUANGZHOU JIANSHENG BUILDING MATERIALS CO LTD
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