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Preparation method of low-alkali polymer high-efficient liquid setting-accelerator for sprayed concrete

A technology of liquid quick-setting agent and sprayed concrete, which is applied in the field of building materials, can solve the problems of large amount of slurry falling and rebound, physical hazards of construction workers, and single performance, so as to reduce the amount of rebound and dust, and improve all aspects performance, no irritating odor effect

Active Publication Date: 2014-05-28
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nowadays, some alkali-free accelerators have been developed abroad, but they are expensive.
[0004] At present, most of the projects in our country are still using the tidal spraying process, which uses powdered accelerator. During the spraying process, there are defects such as a large amount of dust, slumping and rebounding, which have a great impact on the construction.
When the powder accelerator is added, it is dispersed unevenly, causing a lot of waste and serious loss of concrete strength in the later stage
Domestically produced liquid accelerators are unstable in quality, poor in adaptability, high in dosage, generally 6% to 10%, and strong in alkalinity, causing great harm to the health of construction workers.
Moreover, the performance of liquid accelerators produced in my country today is single, which cannot meet the requirements of shotcrete in various aspects, such as the strength of concrete, adhesion with surrounding rock, rebound and dust, etc.
The effect of quick-setting agent is closely related to the mineral components and content in cement. However, the production of cement is affected by many factors such as raw materials and production processes, and the mineral composition varies significantly.
In my country, ordinary Portland cement can contain no more than 20% inactive admixtures, and there are many kinds of admixtures. Therefore, the adaptability of liquid accelerators to cement is very prominent, which seriously affects its use in shotcrete. application in

Method used

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  • Preparation method of low-alkali polymer high-efficient liquid setting-accelerator for sprayed concrete

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation method of low-alkali polymer high-efficiency liquid accelerator for shotcrete is realized through the following steps: 1) Preparation of aluminate mother liquor

[0030] Add 35% potassium hydroxide and 45% aluminum hydroxide to 20% water by mass, and stir with an electric stirring bar for 3 hours at a temperature of 120°C to prepare an aluminate mother liquor;

[0031] 2) Preparation of modifier

[0032] Dissolve 20% sodium carbonate in water, heat to 70°C, then add 40% sodium silicate, react for 0.5h, and form a transparent solution, which is the modifier;

[0033] 3) Preparation of low-alkali polymer high-efficiency liquid accelerator

[0034] Add the aluminate mother liquor obtained in step 1) into a three-necked flask, perform high-speed shear stirring at 500rpm / min, and simultaneously add the modifier prepared in step 2) to obtain a mixed solution. The modifier and aluminate The mass ratio of the mother liquor is 1:2, and the temperature is 60°C. ...

Embodiment 2

[0035] The preparation method of the low-alkali polymer high-efficiency liquid quick-setting agent for shotcrete is realized through the following steps:

[0036] 1) Preparation of aluminate mother liquor

[0037] Add 35% potassium hydroxide and 45% aluminum hydroxide to 20% water by mass, and stir with an electric stirring bar for 3 hours at a temperature of 120°C to prepare an aluminate mother liquor;

[0038] 2) Preparation of modifier

[0039] Dissolve 16% sodium carbonate in water, heat to 70°C, then add 30% sodium silicate, react for 0.5h, and form a transparent solution, which is the modifier;

[0040] 3) Preparation of low-alkali polymer high-efficiency liquid accelerator

[0041] Add the aluminate mother liquor obtained in step 1) into a three-necked flask, perform high-speed shear stirring at 500rpm / min, and simultaneously add the modifier prepared in step 2) to obtain a mixed solution. The modifier and aluminate The mass ratio of the mother liquor is 1:1, and the...

Embodiment 3

[0043] The preparation method of the low-alkali polymer high-efficiency liquid quick-setting agent for shotcrete is realized through the following steps:

[0044] 1) Preparation of aluminate mother liquor

[0045] Add 30% sodium hydroxide and 45% aluminum hydroxide by mass to 25% water, and stir with an electric stirring bar for 3 hours at a temperature of 120°C to prepare an aluminate mother liquor;

[0046] 2) Preparation of modifier

[0047] Dissolve 16% sodium carbonate in water, heat to 70°C, then add 30% sodium silicate, react for 0.5h, and form a transparent solution, which is the modifier;

[0048] 3) Preparation of low-alkali polymer high-efficiency liquid accelerator

[0049] Add the aluminate mother liquor obtained in step 1) into a three-necked flask, perform high-speed shear stirring at 500rpm / min, and simultaneously add the modifier prepared in step 2) to obtain a mixed solution. The modifier and aluminate The mass ratio of the mother liquor is 1:1, and the temp...

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Abstract

The invention discloses a preparation method of a low-alkali polymer high-efficient liquid setting-accelerator for sprayed concrete. The preparation method comprises the following steps: (1) preparing an aluminate mother solution; (2) preparing a modifying agent; (3) preparing a low-alkali polymer high-efficient liquid setting-accelerator. The disclosed low-alkali polymer high-efficient liquid setting-accelerator has a uniform and stable property and strong adaptability; the mixing amount is 2 to 4% of the cement mass, the initial setting time is within 2 minutes, the final setting time is within 5 minutes, the strength loss in the later stage of concrete is within 10%; furthermore, the liquid setting-accelerator can efficiently reduce the dust amount and resilience value during the sprayed concrete construction and improves the strength of sprayed concrete.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a preparation method of a low-alkali polymer high-efficiency liquid quick-setting agent for shotcrete. Background technique [0002] Shotcrete technology is widely used in surrounding rock support in geotechnical engineering and underground engineering. Accelerator is an indispensable admixture in shotcrete. It can make cement harden quickly, reduce rebound loss, and prevent shotcrete from The shedding caused by gravity improves its adaptability to use in wet or water-bearing rock formations, and produces higher early strength, increasing the thickness of a shot, and its performance has a greater impact on shotcrete. [0003] Accelerators are mainly divided into powder accelerators and liquid accelerators. Powder accelerators are mostly used in dry shotcrete, and liquid accelerators are mainly used in wet shotcrete. Traditional accelerators are mostly powder accelerators with h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/10
Inventor 李树忱张露晨徐咸辉李术才冯丙阳
Owner SHANDONG UNIV
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