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Liquid alkali-free accelerator and preparation method thereof

A quick-setting agent and liquid technology, which is applied in the field of building material admixtures, can solve the problems of large fluctuations in product quality, high viscosity of the quick-setting agent, and poor stability, and achieve reduced transportation and use costs, low dosage, and good stability Effect

Active Publication Date: 2020-11-06
JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to improve the technical deficiencies of the existing products and develop a liquid alkali-free quick-setting agent and its preparation method, which is used to solve the problem of high viscosity, poor stability, easy delamination and large fluctuations in product quality of the existing suspension system quick-setting agent. And other issues

Method used

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  • Liquid alkali-free accelerator and preparation method thereof
  • Liquid alkali-free accelerator and preparation method thereof
  • Liquid alkali-free accelerator and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] The preparation steps are as follows:

[0034] (1) at first 43.7wt% water and 5wt% triethanolamine are added to the reaction kettle at a constant temperature of 50°C and stirred;

[0035] (2) adding 0.2wt% modified suspending agent (magnesium aluminum silicate), stirring continuously for 2h to complete dispersion;

[0036] (3) adding 45wt% aluminum sulfate and 5wt% magnesium sulfate successively, and stirring continuously for 3h to complete dispersion;

[0037] (4) adding 0.1wt% polyaspartic acid and stirring for 30min;

[0038] (5) finally adding 1wt% formic acid and stirring for 12min to obtain the low viscosity high performance liquid alkali-free quick-setting agent.

Embodiment 2

[0040] The preparation steps are as follows:

[0041] (1) at first 34.5wt% water and 8wt% diethanolamine are added into the reactor at constant temperature of 50°C and stirred;

[0042] (2) Add 0.4wt% modified suspending agent (attapulgite), continue stirring for 1h to complete dispersion;

[0043] (3) adding 50wt% aluminum sulfate and 5wt% magnesium sulfate successively, stirring continuously for 3h to complete dispersion;

[0044] (4) adding 0.1wt% polyaspartic acid and stirring for 30min;

[0045] (5) finally adding 2wt% nitric acid and stirring for 12min to obtain the low-viscosity high-performance liquid alkali-free quick-setting agent.

Embodiment 3

[0047] The preparation steps are as follows:

[0048] (1) 32.4wt% of water and 5wt% of diethylenetriamine are added to the reaction kettle at a constant temperature of 55°C and stirred;

[0049] (2) add 0.4wt% modified suspending agent (montmorillonite powder), continue stirring for 3h;

[0050] (3) adding 55wt% aluminum sulfate and 5wt% magnesium sulfate successively, stirring continuously for 3h to complete dispersion;

[0051] (4) add 0.2wt% polyaspartic acid, stir 30min;

[0052] (5) finally adding 2wt% formic acid and stirring for 18min to obtain a liquid alkali-free accelerator.

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Abstract

The invention discloses a liquid alkali-free accelerator and a preparation method thereof. The accelerator is prepared from the following raw materials in percentage by mass: 45 to 70 weight percent of aluminum sulfate, 2 to 10 weight percent of magnesium sulfate, 5 to 10 weight percent of organic amine, 0.2 to 0.6 weight percent of a modified suspending agent, 1 to 3 weight percent of a pH regulator, 0.1 to 0.5 weight percent of a viscosity reducer and the balance of water. The liquid alkali-free accelerator prepared by the invention can be used in wet shotcrete construction, and has the advantages of short setting time, high early strength, low liquid viscosity and the like. When the doping amount is 4%, the technical requirements can be met, and the concrete can be widely applied to supporting, repairing and the like of tunnels, highways, railways and subways.

Description

technical field [0001] The invention belongs to the technical field of building material admixtures, relates to an accelerator for shotcrete, and in particular relates to a low-viscosity suspension type liquid alkali-free accelerator and a preparation method thereof. Background technique [0002] The concrete constructed by the spraying method is called shotcrete. Shotcrete has many advantages that ordinary formwork pouring concrete cannot compare with. Especially in the bolt and shotcrete support of various underground projects, it has become a very important and necessary part of modern underground engineering. measure. It is mainly used in the bolt and shotcrete support of tunnels, wells, slope protection and other projects, as well as in the process of plugging and emergency repair. [0003] Accelerator is an admixture that adjusts the rate of setting and hardening of concrete (or mortar). It can accelerate the hydration of cement and significantly shorten the setting t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/28C04B103/12
CPCC04B40/0039C04B2103/12C04B22/148C04B22/142C04B24/122C04B22/08C04B24/28C04B24/04C04B22/082C04B22/085
Inventor 王靖淳钱珊珊甘杰忠赵旭彭荩影姜海东郑春扬
Owner JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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