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Liquid accelerator for sprayed concrete and preparation method and application thereof

A technology of sprayed concrete and quick-setting agent, which is applied in the field of mine and tunnel construction, which can solve the problems of insufficient durability, shrinkage of strength, strong corrosion, etc., and achieve the effect of increasing spraying thickness, reducing rebound rate and low alkali content

Active Publication Date: 2014-03-26
RES INST OF HIGHWAY MINIST OF TRANSPORT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Therefore, in view of the impact of the accelerator on the mechanical properties, construction performance and construction methods of shotcrete, the application has developed a low-resilience and low-alkali liquid accelerator for shotcrete to solve the current problem. There are problems such as large amount of dust, high rebound rate, strong corrosion, late strength shrinkage and insufficient durability of shotcrete after hardening in the shotcrete construction process in the technology.

Method used

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Examples

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preparation example Construction

[0038] The application also provides a preparation method of the liquid quick-setting agent described in the application, which is characterized in that it comprises the following steps:

[0039] a. Accurately weigh each component according to the component content of the quick-setting agent;

[0040] b. Dissolve the weighed sodium fluoride in water, add triethanolamine after the dissolution is complete, and stir evenly;

[0041] c. After heating the solution to 60°C to 80°C, add aluminum sulfate while stirring, add the adjusting component after stirring until it is completely dissolved, and adjust the pH value of the solution to 2 to 3;

[0042] d. Cool the solution to room temperature, and add the rebound inhibiting component under stirring.

[0043] During the process of adding the rebound inhibiting component, the rotation speed of the mixer is 950-1500r / min, and the linear speed of the blade is controlled within the range of 10-20m / s.

[0044] The present application al...

Embodiment 1

[0098] In this example, the liquid accelerator for shotcrete includes the following components: 40 parts by mass of aluminum sulfate, 6 parts by mass of triethanolamine, 6 parts by mass of sodium fluoride, 2 parts by mass of phosphoric acid, hydroxypropyl methylcellulose 0.7 parts by mass, 8.3 parts by mass of nano silicon dioxide, and 37 parts by mass of water.

[0099] The liquid quick-setting agent is prepared through the following steps: First, weigh each component; then dissolve the weighed sodium fluoride in water, add triethanolamine after the dissolution is complete, and stir evenly; then, heat the solution to 70°C Finally, add aluminum sulfate while stirring, add phosphoric acid after stirring until completely dissolved, adjust the pH value to 2, and cool the solution to room temperature. Add hydroxypropyl methylcellulose and nano-silica under high-speed stirring. During the addition process, the rotation speed of the stirrer is 1000r / min, and the linear speed of the ...

Embodiment 2

[0103] In this example, the liquid accelerator for shotcrete includes the following components: 40 parts by mass of aluminum sulfate, 6 parts by mass of triethanolamine, 6 parts by mass of sodium fluoride, 2 parts by mass of phosphoric acid, hydroxypropyl methylcellulose 0.8 parts by mass, 8.2 parts by mass of nano silicon dioxide, and 37 parts by mass of water.

[0104] The liquid quick-setting agent is prepared through the following steps: First, weigh each component; then dissolve the weighed sodium fluoride in water, add triethanolamine after the dissolution is complete, and stir evenly; then, heat the solution to 70°C Finally, add aluminum sulfate while stirring, add phosphoric acid after stirring until completely dissolved, adjust the pH value to 3, and cool the solution to room temperature. Add hydroxypropyl methylcellulose and nano-silica under high-speed stirring. During the addition process, the rotation speed of the stirrer is 1000r / min, and the linear speed of the ...

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Abstract

The invention relates to a low rebound low-alkaline liquid accelerator for sprayed concrete, and a preparation method and application thereof, belonging to the technical field of mine and tunnel construction. The liquid accelerator comprises the following components in parts by mass: 35-45 parts of aluminum sulfate, 4-8 parts of triethanolamine, 3-9 parts of sodium fluoride, 1-3 parts of regulating component, 6-12 parts of rebound inhibitor component and 35-55 parts of water. The accelerator can effectively solve the general problem at present that the sprayed concrete has high rebound rate, low strength and poor durability, so that the sprayed concrete has characteristics of high workability (low rebound rate and less dust) and high durability (high strength, high anti-permeability and high corrosion resistance), the construction production environment condition of the sprayed concrete is improved, and long-term safe usability of the sprayed concrete structure is improved.

Description

technical field [0001] The application belongs to the technical field of mine and tunnel construction, and relates to a liquid quick-setting agent for wet shotcrete, in particular to a low-resilience and low-alkali liquid quick-setting agent for wet shotcrete in mines and tunnels, and Its preparation method and use. Background technique [0002] Shotcrete is a kind of concrete that uses compressed air to spray the concrete mixture to the working surface at high speed and then compacts it. It is widely used in mine tunnels, rock slopes, building foundation pits, building structure reinforcement and other projects. Compared with ordinary concrete, shotcrete has the advantages of fast construction speed, simple process, high early strength and low cost; especially the flexible construction operation mode, which can make thin-walled concrete in any direction at high altitude, deep pit or narrow working area Or structures with complex shapes; the construction occupies a small a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/12C04B22/14
Inventor 王稷良宋敬亮杨志峰刘康王大鹏柯国炬彭鹏孙洪峰谢晋德
Owner RES INST OF HIGHWAY MINIST OF TRANSPORT
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