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Low-resilience liquid accelerator for shotcrete and preparation method thereof

A shotcrete and low-rebound technology, which is used in the preparation of low-rebound liquid accelerators for shotcrete, the preparation of low-rebound liquid accelerators, and the field of concrete admixtures. Good performance, low rebound rate, etc., to achieve the effect of improving the quick-setting effect, good cement adaptability, and low rebound rate

Active Publication Date: 2016-11-09
SHIJIAZHUANG CHANGAN YUCAI BUILDING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above technologies have not given specific guidance on how to make the quick-setting agent for shotcrete have short setting time, low rebound rate, moderate viscosity, less sedimentation, and good cement adaptability.

Method used

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  • Low-resilience liquid accelerator for shotcrete and preparation method thereof
  • Low-resilience liquid accelerator for shotcrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1 (comparative embodiment): the low-rebound liquid quick-setting agent for shotcrete of the present invention is made from the raw material of following components and mass percent (mass fraction): sodium hydroxide 29.5%, hydrogen Aluminum oxide 34.86% (the addition of aluminum hydroxide is based on Na + / Al 3+ The molar ratio is 1.65:1 for feeding), synergist 6.5%, triethanolamine (coagulant) 0.7%, potassium dichromate (viscosity modifier) ​​0.005%, water 35%; the mass percentage of the above-mentioned components The sum is 100%.

[0019] The preparation method of described sprayed concrete with low resilience liquid quick-setting agent comprises the following process steps: 1. the dissolving of synergist: sodium hydroxide and synergist are added together (add together) reactor by above-mentioned mass percentage, for For comparison, the synergist does not use sodium silicate, but a conventional synergist, and at the same time slowly and evenly add water, tur...

Embodiment 2

[0020] Embodiment 2: the low-rebound liquid quick-setting agent for shotcrete of the present invention is made from the raw material of following components and mass percent (mass fraction): sodium hydroxide 28.1%, aluminum hydroxide 33.21% (hydroxide The amount of aluminum added is based on Na + / Al 3+ The molar ratio is 1.65:1 for feeding), sodium silicate (synergist) 3.0%, triethanolamine (coagulant, alcohol amine substances) 0.685%, potassium dichromate (viscosity modifier) ​​0.005%, water 35%; the sum of the mass percentages of the above-mentioned components is 100%.

[0021] The preparation method of the low-resilience liquid quick-setting agent for shotcrete comprises the following process steps: 1. Dissolution of the synergist: Add sodium hydroxide and the synergist to the reactor according to the above mass percentage, and slowly and evenly add Water, turn on the mixer and heater, stir at 120r / min, heat to 70°C, use sodium hydroxide to dissolve the heat in the proce...

Embodiment 3

[0022] Embodiment 3: the low-rebound liquid accelerator for shotcrete of the present invention is made from the raw material of following components and mass percent (mass fraction): sodium hydroxide 27.2%, aluminum hydroxide 32.15% (hydroxide The amount of aluminum added is based on Na + / Al 3+ The molar ratio is 1.65:1 for feeding), sodium silicate (synergist) 5.0%, triethanolamine (coagulant) 0.645%, potassium dichromate (viscosity regulator) 0.005%, water 35%; The sum of the mass percentages of the components is 100%.

[0023] The preparation method of the low-rebound liquid quick-setting agent for shotcrete is the same as in Example 2.

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Abstract

The invention discloses a low-resilience liquid accelerator for shotcrete and a preparation method thereof. The accelerator is prepared from the following raw materials in percent by mass: 20%-40% of sodium hydroxide, 25%-40% of aluminium hydroxide, 3%-10% of a synergist, 0.5%-2% of a setting accelerator, 0.003%-0.02% of a viscosity adjusting agent, and the balance water, wherein, the synergist is sodium silicate, the setting accelerator is an alcohol amine substance, and the viscosity adjusting agent is potassium chromate or sodium nitrite. The preparation method comprises the following technical steps: adding sodium hydroxide and the synergist into a reaction kettle, adding water, and starting an agitator and a heater; keeping the temperature after the temperature reaches a set temperature, adding aluminium hydroxide, and reacting with the constant temperature; adding the viscosity adjusting agent, stirring, heating, reacting with a constant temperature, then stopping heating, and naturally cooling; and adding the setting accelerator after the reaction system is cooled, and cooling to room temperature, so as to obtain the accelerator. The accelerator is short in setting time, low in resilience and moderate in viscosity, generates a little sediment, has good cement adaptability, and the preparation method for the accelerator is simple, practicable and energy-saving.

Description

technical field [0001] The invention relates to a concrete admixture, in particular to a low-rebound liquid quick-setting agent for shotcrete, which belongs to the technical field of building materials. The prepared quick-setting agent is suitable for wet sprayed concrete, and is used in mines, tunnels, etc. Construction of shotcrete for underground engineering construction. The invention also relates to a preparation method of the low-rebound liquid quick-setting agent for shotcrete. Background technique [0002] The quick-setting agent is divided into powder and liquid. Among them, the powder quick-setting agent has poor construction and operation environment, which will cause great harm to the workers, and the dry spraying process is not easy to control. Therefore, it is now gradually replaced by liquid accelerators. Liquid accelerators mainly include alkaline liquid accelerators and alkali-free liquid accelerators. The main components of non-alkali liquid quick-settin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/12
CPCC04B40/0039C04B2103/12C04B22/062C04B22/06C04B24/122C04B22/08C04B22/087C04B22/085
Inventor 袁勇刘昭洋刘欢王锦宇王进春倪涛刘旭飞刘江涛
Owner SHIJIAZHUANG CHANGAN YUCAI BUILDING MATERIALS
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