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Suspended alkali-free liquid accelerator and preparation method thereof

A technology of quick-setting agent and liquid, which is applied in the field of suspension-type non-alkali liquid quick-setting agent and its preparation. It can solve the problems of ready-mixed concrete spraying, high requirements for spraying machinery, and pipe plugging of spraying machinery, so as to reduce pipe plugging. , Good coagulation effect, early strength improvement effect

Active Publication Date: 2021-05-04
佛山市凯隽新建材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Directly adding solid mineral admixtures or other organic materials into concrete can effectively improve the cohesion of concrete, but this method is added before the spraying operation, which will cause the pumped ready-mixed concrete to be unable to be effectively sprayed out by the spraying machine , the requirements for the injection machinery are high, which often cause the pipe blockage of the injection machinery

Method used

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  • Suspended alkali-free liquid accelerator and preparation method thereof
  • Suspended alkali-free liquid accelerator and preparation method thereof
  • Suspended alkali-free liquid accelerator and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] A suspension-type non-alkali liquid quick-setting agent of the present embodiment includes the following components in mass percentage:

[0037]

[0038] A suspension type non-alkali liquid quick-setting agent of the present embodiment is prepared by the following method:

[0039] (1) Preparation of magnesium-aluminum layered double metal hydroxide: magnesium sulfate and aluminum sulfate are pressed by Mg 2+ / Al 3+ Dissolve in a mixed solvent of water and N,N-dimethylformamide with a volume ratio of 1:2 at a molar ratio of 2:1, then add sodium hydroxide and stir to mix evenly, and then heat it in water at a temperature of 120-150°C After the reaction, the solid product is filtered, washed, dried and ground to obtain nano-sized magnesium-aluminum layered double metal hydroxide.

[0040] (2) Preparation of amino-terminated hyperbranched polymer: Add N,N-methylenebisacrylamide and diethylenetriamine at a molar ratio of 1:1.5 into N,N-dimethylformamide solvent, and then ...

Embodiment 2

[0043] A suspension-type non-alkali liquid quick-setting agent of the present embodiment includes the following components in mass percentage:

[0044]

[0045] A suspension type non-alkali liquid quick-setting agent of the present embodiment is prepared by the following method:

[0046] (1) Preparation of magnesium-aluminum layered double metal hydroxide: magnesium sulfate and aluminum sulfate are pressed by Mg 2+ / Al 3+ Dissolve in a mixed solvent of water and N,N-dimethylformamide with a volume ratio of 1:2 at a molar ratio of 3:1, then add sodium hydroxide and stir to mix evenly, and then heat it in water at a temperature of 120-150°C After the reaction, the solid product is filtered, washed, dried and ground to obtain nano-sized magnesium-aluminum layered double metal hydroxide.

[0047] (2) Preparation of amino-terminated hyperbranched polymer: Add N,N-methylenebisacrylamide and diethylenetriamine at a molar ratio of 1:1.5 into N,N-dimethylformamide solvent, and the...

Embodiment 3

[0050] A suspension-type non-alkali liquid quick-setting agent of the present embodiment includes the following components in mass percentage:

[0051]

[0052] A suspension type non-alkali liquid quick-setting agent of the present embodiment is prepared by the following method:

[0053] (1) Preparation of magnesium-aluminum layered double metal hydroxide: magnesium sulfate and aluminum sulfate are pressed by Mg 2+ / Al 3+ The molar ratio is 4:1, dissolved in a mixed solvent of water and N,N-dimethylformamide with a volume ratio of 1:2, then adding sodium hydroxide and stirring to mix evenly, and then hydrothermally After the reaction, the solid product is filtered, washed, dried and ground to obtain nano-sized magnesium-aluminum layered double metal hydroxide.

[0054] (2) Preparation of amino-terminated hyperbranched polymer: Add N,N-methylenebisacrylamide and diethylenetriamine at a molar ratio of 1:1.2 into N,N-dimethylformamide solvent, and then Add N,N-methylenebisa...

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Abstract

The invention belongs to the technical field of concrete admixtures, and discloses a suspension type alkali-free liquid accelerator and a preparation method thereof. The preparation method comprises the following steps: firstly, respectively preparing magnesium-aluminum layered double hydroxide and an amino-terminated hyperbranched polymer, then adding the magnesium-aluminum layered double hydroxide and the amino-terminated hyperbranched polymer into water, stirring and dispersing uniformly, and then adding aluminum sulfate and a pH regulator, stirring and dispersing uniformly to obtain the suspension type alkali-free liquid accelerator. The magnesium-aluminum layered double-metal hydroxide with high dispersing performance and high specific surface area is further cooperated with the amino-terminated hyperbranched polymer to form a co-stabilizing system and a tackifying system of an inorganic-organic polymer, so that a high-concentration supersaturated aluminum sulfate solution system can be subjected to suspension stabilization; and a good quick-setting effect can be achieved, the early strength of the concrete is improved, the rebound rate of the sprayed concrete is reduced, and the pipe blocking phenomenon in the application process of the sprayed concrete is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a suspension-type alkali-free liquid quick-setting agent and a preparation method thereof. Background technique [0002] Accelerator is a coagulation regulator that can accelerate the setting and hardening speed of concrete. Its main function is to accelerate the hydration and hardening of cement and form sufficient strength in a short time to meet the requirements of special construction. Conventional quick-setting agents often include alkali metals, but these accelerators are strongly alkaline, often accompanied by undesirable disadvantages, such as the presence of strong alkalis can easily cause alkali-aggregate reactions, damage the concrete structure, and cannot fully achieve construction engineering requirements. At the same time, the quick-setting agent is too alkaline, which poses a certain threat to the health of the construction workers and has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/28C04B103/12
CPCC04B40/0039C04B2103/12C04B22/148C04B22/06C04B24/06C04B24/287C04B24/123C04B22/165
Inventor 李培春李桂青卢才能吴文华星耀
Owner 佛山市凯隽新建材科技有限公司
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