Alkali-free liquid setting accelerator for shotcrete and preparation method thereof

A technology of sprayed concrete and accelerator, applied in the field of building materials, can solve the problems of high alkali content, strong corrosion, strength loss, etc., and achieve the effects of low rebound rate, stable performance and small dust pollution

Active Publication Date: 2018-01-16
JIANGSU NIGAO SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main technical problem to be solved by the present invention is to provide a non-alkali liquid quick-setting agent for shotcrete and its preparation method. The cement has wide adaptability, no alkali and chlorine, low dosage and stable performance, and solves the problem of alkali quick-setting agent in powder and liquid. Disadvantages such as high content of coagulant alkali, serious loss of strength in the later stage, and strong corrosion

Method used

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  • Alkali-free liquid setting accelerator for shotcrete and preparation method thereof
  • Alkali-free liquid setting accelerator for shotcrete and preparation method thereof
  • Alkali-free liquid setting accelerator for shotcrete and preparation method thereof

Examples

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Embodiment 1

[0025] A kind of non-alkali liquid quick-setting agent for shotcrete, the weight ratio of each raw material is as shown in table 1, wherein aluminum sulfate contains the industrial grade aluminum sulfate of eighteen crystal waters, the mass percentage of aluminum oxide ≥ 15.8%; The regulator is concentrated phosphoric acid, industrial grade, with a mass percentage ≥ 85%; aluminum hydroxide is activated aluminum hydroxide with a mesh number of 1500; alcohol amine is diethanolamine; dispersant is polycarboxylate water reducer; early strength agent It is sodium nitrate; the anti-sedimentation agent is hydrated magnesium silicate colloid with a mass content of 8%.

[0026] The preparation method of the alkali-free liquid quick-setting agent for shotcrete specifically comprises the following steps:

[0027] (1) Weigh each raw material according to the weight ratio;

[0028] (2) First add water to the four-necked flask, start stirring, add dispersant, anti-sedimentation agent and a...

Embodiment 2

[0034] A kind of non-alkali liquid quick-setting agent for shotcrete, the weight ratio of each raw material is as shown in table 1, wherein aluminum sulfate contains the industrial grade aluminum sulfate of eighteen crystal waters, the mass percentage of aluminum oxide ≥ 15.8%; Regulator is concentrated phosphoric acid, industrial grade, mass percentage ≥ 85%; aluminum hydroxide is activated aluminum hydroxide with a mesh number of 1500; alcohol amine is triethanolamine; dispersant is polycarboxylate water reducer; early strength agent It is calcium formate; the anti-settling agent is hydrated magnesium silicate colloid with a mass content of 8%.

[0035] The preparation method of the alkali-free liquid quick-setting agent for shotcrete specifically comprises the following steps:

[0036] (1) Weigh each raw material according to the weight ratio;

[0037] (2) First add water to the four-necked flask, start stirring, add dispersant, anti-sedimentation agent and acid regulator ...

Embodiment 3

[0043] A kind of non-alkali liquid quick-setting agent for shotcrete, the weight ratio of each raw material is as shown in table 1, wherein aluminum sulfate contains the industrial grade aluminum sulfate of eighteen crystal waters, the mass percentage of aluminum oxide ≥ 15.8%; The regulator is concentrated phosphoric acid, industrial grade, with a mass percentage ≥ 85%; aluminum hydroxide is activated aluminum hydroxide with a mesh number of 1500; alcohol amine is diethanolamine; dispersant is polycarboxylate water reducer; early strength agent It is calcium formate; the anti-settling agent is hydrated magnesium silicate colloid with a mass content of 8%.

[0044] The preparation method of the alkali-free liquid quick-setting agent for shotcrete specifically comprises the following steps:

[0045] (1) Weigh each raw material according to the weight ratio;

[0046] (2) First add water to the four-necked flask, start stirring, add dispersant, anti-sedimentation agent and acid ...

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Abstract

The invention discloses an alkali-free liquid setting accelerator for shotcrete and a preparation method thereof; the setting accelerator comprises the following raw materials: aluminum sulfate, an acidity regulator, aluminum hydroxide, organic alcohol amine, an early strength agent, a dispersant, an anti-settling agent and water. The preparation method comprises the steps: firstly adding water into a reactor, starting to stir, sequentially adding the dispersant, the anti-settling agent and the acidity regulator, and starting to heat; when the solution is heated to 90 DEG C-100 DEG C, adding aluminum hydroxide and the early strength agent, and stirring and carrying out heat preservation at the temperature of 80-90 DEG C; after completion of heat preservation, adding aluminum sulfate and completing addition in batches, and keeping the temperature of the system at 80-100 DEG C; after completion of addition, carrying out heat preservation for half an hour until the solution is clarified;and finally adding organic alcohol amine, and after completion of addition, carrying out heat preservation for 2-3 hours. The setting accelerator has the characteristics of wide cement adaptability, stable performance, good storage stability and the like. Besides, the shotcrete using the setting accelerator has the characteristics of low mixing amount, low resilience rate, low dust pollution and the like.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to an alkali-free liquid accelerator for shotcrete and a preparation method thereof. Background technique [0002] At present, the acceleration of large-scale mining, tunnel excavation, and road network and railway network construction has greatly increased the amount of accelerators, and put forward higher requirements for the performance and quality of accelerators. The currently used accelerators are mainly alkaline accelerators, especially powder accelerators for dry spraying construction. Most of the powder accelerators contain strong alkaline substances and are highly corrosive. It is easy to cause injury to the construction personnel, and it is easy to cause the strength of the concrete to decrease, the surface to crack, peel off, or even collapse, resulting in safety accidents, and the strength of the concrete is seriously lost in the later stage, which seriously ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/12C04B103/12
Inventor 王文军王道正佟小强吴益陈囡李宝川
Owner JIANGSU NIGAO SCI & TECH
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