Low-doping-amount and high-performance alkali-free and chlorine-free liquid setting accelerator and preparation method thereof

A high-performance, quick-setting agent technology, applied in the field of building materials, can solve the problems of non-marketability, productization, small 28d strength ratio, narrow cement application range, etc., and achieve high early strength, favorable viscosity, and remarkable coagulation-accelerating effect Effect

Inactive Publication Date: 2019-01-18
PANZHIHUA CITY JIYUAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Liquid accelerators for wet shotcrete include alkali, low-alkali, and alkali-free liquid accelerators. From the perspective of their development, the main problems are: high alkali content, large dosage, short stable period, 1d Low strength, 28d strength ratio less than 100%, etc.
Most of the research and development achievements are only in the laboratory stage. On the one hand, they do not meet the

Method used

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  • Low-doping-amount and high-performance alkali-free and chlorine-free liquid setting accelerator and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment provides a non-alkali and chlorine-free liquid quick-setting agent for sprayed concrete. Its components and the mass parts of each component are as follows: 30 parts of aluminum sulfate, 10 parts of magnesium sulfate, 0.5 parts of precipitated hydrated magnesium silicate 0.5 parts of magnesium oxide, 1 part of magnesium fluorosilicate, 2 parts of triethanolamine, 1 part of polyacrylamide, 0.5 parts of citric acid, 40 parts of mother liquor (aluminum hydroxide, hydrofluoric acid, complexing agent) and 30 parts of water .

[0032] The mother liquor is 69 parts by weight of hydrofluoric acid, 23 parts by weight of aluminum hydroxide and 8 parts by weight of a complexing agent.

[0033] The preparation method comprises the steps of:

[0034] (1) Preparing mother liquor at normal temperature: First, the hydrofluoric acid of 30 parts by weight is stirred at normal temperature, then the aluminum hydroxide of said parts by weight is added and mixed and stirred ...

Embodiment 2

[0038]This embodiment provides a non-alkali and chlorine-free liquid quick-setting agent for sprayed concrete. Its components and the mass parts of each component are as follows: 60 parts of aluminum sulfate, 0.8 part of precipitated hydrated magnesium silicate, 1 part of magnesium oxide 2 parts of magnesium fluorosilicate, 3 parts of diethanolamine, 1.5 parts of polyacrylamide, 0.8 parts of oxalic acid, 30 parts of mother liquor (aluminum hydroxide, hydrofluoric acid, complexing agent) and 40 parts of water.

[0039] The mother liquor is 61 parts by weight of hydrofluoric acid, 30 parts by weight of aluminum hydroxide and 9 parts by weight of a complexing agent.

[0040] The preparation method comprises the steps of:

[0041] (1) Preparing mother liquor at normal temperature: First, the hydrofluoric acid of 30 parts by weight is stirred at normal temperature, then the aluminum hydroxide of said parts by weight is added and mixed and stirred for 10 min, and the hydrofluoric ac...

Embodiment 3

[0045] This embodiment provides a non-alkali and chlorine-free liquid quick-setting agent for sprayed concrete, its components and the mass parts of each component are as follows: 50 parts of aluminum sulfate, 7 parts of magnesium sulfate, 1 part of precipitated hydrated magnesium silicate 2 parts of magnesium oxide, 2 parts of magnesium fluorosilicate, 1.5 parts of diethanolamine, 1 part of polyacrylamide, 1 part of citric acid, 10 parts of mother liquor (aluminum hydroxide, hydrofluoric acid, complexing agent) and 35 parts of water .

[0046] The mother liquor is 56 parts by weight of hydrofluoric acid, 37 parts by weight of aluminum hydroxide and 7 parts by weight of a complexing agent.

[0047] The preparation method comprises the steps of:

[0048] (1) Preparing mother liquor at normal temperature: First, the hydrofluoric acid of 30 parts by weight is stirred at normal temperature, then the aluminum hydroxide of said parts by weight is added and mixed and stirred for 10 ...

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Abstract

The invention provides a low-doping-amount and high-performance alkali-free and chlorine-free liquid setting accelerator and a preparation method thereof and belongs to the field of building materials. The setting accelerator is prepared from the following raw materials in percentage by weight: 30 to 60 parts of potassium sulfate, 0 to 20 parts of magnesium sulfate, 0.5 to 2.0 parts of precipitated magnesium silicate hydrate, 0.5 to 2.0 parts of magnesium oxide, 1 to 3 parts of magnesium fluosilicate, 1 to 3 parts of alkylol amine, 0.5 to 1.5 parts of a high polymer, 0.2 to 1.0 part of a stabilizing agent, 5 to 40 parts of a mother solution and 30 to 50 parts of water. The obtained liquid setting accelerator has the density of 1.3 to 1.5g/cm<3>, the pH (Potential of Hydrogen) value of 2.5to 3.5, the solid content of 37 to 45 percent and the alkali content of less than or equal to 1.0 percent. The alkali-free liquid setting accelerator provided by the invention has the advantage of nocorrosive and irritating odor, low doping amount, good adaptability to cement, rapid condensation speed and high strength and good stability; and the stabilization period reaches 180 days or more, thetechnology feasibility is strong and the liquid setting accelerator is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to a low-volume high-performance non-alkali and chlorine-free liquid quick-setting agent and a preparation method thereof. Background technique [0002] Due to the characteristics of high construction efficiency, friendly construction environment and low springback, wet shotcrete is gradually replacing the traditional dry shotcrete. Liquid accelerators are mainly used in the preparation of shotcrete for high-speed rail, high-speed, and subway tunnel construction. Adding the accelerator to the sprayed cement mortar and concrete can not only accelerate the setting and hardening speed of the cement, but also improve the early strength, with little or even no influence on the later strength, and greatly improve the cohesion and bond strength of the concrete, and reduce the rebound The efficiency is improved, the economic benefit is improved, the alkaline cement dust in the air is redu...

Claims

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Application Information

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IPC IPC(8): C04B24/26C04B103/12
CPCC04B40/0039C04B2103/12C04B22/00C04B22/126C04B22/148C04B22/142C04B24/122C04B22/066C04B24/2652C04B12/04C04B24/06C04B24/04
Inventor 何晓君何中建古朝见张毕军
Owner PANZHIHUA CITY JIYUAN TECH
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