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Liquid alkali-free accelerator and preparation method thereof

A quick-setting agent and liquid technology, applied in the field of liquid alkali-free accelerator and its preparation, can solve the problems of large production pollution, high corrosion, low strength, etc., and achieve good hydrolytic stability, low corrosion, and early stage high intensity effect

Pending Publication Date: 2022-08-02
CHINA RAILWAY FIRST SURVEY & DESIGN INST GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to make up for the deficiencies of the prior art, the present invention provides a liquid non-alkali accelerator and its preparation method, which solves the problem of high corrosion caused by fluorine and alkali ions in the existing non-alkali accelerator, lack of strength in the early stage, and low strength in the later stage. The problem of low intensity and high pollution in production

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  • Liquid alkali-free accelerator and preparation method thereof

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preparation example Construction

[0025] The invention provides a chlorine-free and fluorine-free liquid alkali-free quick-setting agent and a preparation method thereof. The liquid alkali-free quick-setting agent is chlorine-free, alkali-free and fluorine-free, and solves the problem of the problems caused by fluorine and alkali ions in the existing alkali-free quick-setting agent. It has the problems of high corrosiveness, no strength in the early stage, low strength in the later stage, and high pollution in production; and the production is environmentally friendly and safe to use. The obtained chlorine-free and fluorine-free liquid alkali-free accelerator has a performance of 7% under the dosage of 7%. According to the standard requirements of Q / CR 807-2020 "Liquid Alkali-free Accelerator for Tunnel Shotcrete", the strength of mortar should reach 1.0MPa or more in 6 hours, and the strength of mortar in one day should reach 10.0Mpa or more, with basically no loss of strength in the later stage, and low reboun...

Embodiment 2

[0040] A liquid alkali-free setting accelerator comprises 10kg of diethylamine, 10kg of ethylenediamine, 5kg of silicic acid, 1500kg of water, 3500kg of aluminum sulfate octadecahydrate, and 5kg of dodecylamine polyoxyethylene ether; the preparation method comprises the following steps:

[0041] Step 1: 10kg of diethylamine, 10kg of ethylenediamine, 5kg of silicic acid and 1000kg of water were added to the reactor in turn, stirred for 10min, and mixed uniformly;

[0042] Step 2: Slowly add 3500kg of aluminum sulfate octadecahydrate, and heat it, stop heating after heating to 70°C, and stir for 30min;

[0043] Step 3: After dropping to 40°C, add 5kg of dodecylamine polyoxyethylene ether and 500kg of water, stir for 30min, and cool to room temperature to obtain a liquid alkali-free accelerator.

Embodiment 3

[0045] A liquid alkali-free setting accelerator comprises 30kg of polyethylene polyamine, 5kg of silicic acid, 1500kg of water, 3500kg of aluminum sulfate octadecahydrate, 5kg of dodecylamine polyoxyethylene ether, and 5kg of dodecyl dimethyl amine oxide; The preparation method includes the following steps:

[0046] Step 1: 30kg of polyethylene polyamine, 5kg of silicic acid and 1000kg of water were added to the reaction kettle in turn, stirred for 10min, and mixed evenly;

[0047] Step 2: Slowly add 3500kg of aluminum sulfate octadecahydrate, and heat it, stop heating after heating to 70°C, and stir for 30min;

[0048] Step 3: After dropping to 40°C, add 5kg of dodecylamine polyoxyethylene ether, 5kg of dodecyl dimethylamine oxide and 500kg of water, stir for 30min, and cool to room temperature to obtain a liquid alkali-free setting accelerator.

[0049] 4) Embodiment four

[0050] A liquid alkali-free accelerator includes 20kg of polyethylene polyamine, 20kg of ethylenedia...

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Abstract

The invention discloses a liquid alkali-free accelerator and a preparation method thereof. The existing alkali-free accelerator contains a large amount of fluorine ions, has no strength in the early stage, is low in strength in the later stage, is large in mixing amount, is long in setting time, is high in corrosion to a steel reinforcement framework, and hinders sprayed concrete construction. The aluminum sulfate cement comprises the following components in parts by weight: 35-50 parts of aluminum sulfate octadecahydrate, 3-7 parts of a stabilizer, 0.5-1.5 parts of a surfactant, 3-7 parts of an early strength agent and the balance of water, dissolving the stabilizer and the early strength agent in water; adding aluminum sulfate octadecahydrate, heating and dissolving; cooling the mixed solution, adding the surfactant and the residual water, stirring for reaction, and cooling to room temperature to obtain the liquid alkali-free accelerator. The obtained liquid accelerator is free of chlorine, alkali and fluorine, free of loss on the later strength of concrete, small in corrosivity and free of environmental pollution, and the coagulation effect and shear strength of the accelerator on the concrete are not affected.

Description

technical field [0001] The invention belongs to the technical field of building construction and building materials, and particularly relates to a liquid alkali-free setting accelerator and a preparation method thereof. Background technique [0002] Accelerators are mainly used in the construction of shotcrete, generally used in tunnels, culverts, industrial and mining construction. When shotcrete is used, it is added at the nozzle to make it harden and solidify rapidly. Traditional accelerators generally have strong alkalinity. Although they can meet the requirements of shotcrete, they also bring many problems: shotcrete has large strength loss and strong corrosion in the later stage. In addition, it may cause environmental pollution, especially for groundwater. Environmental pollution, dust and rebound are not convenient for sprayed concrete wet operation; on the other hand, it may also cause concrete alkali-aggregate reaction, resulting in concrete strength retention rate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/12C04B22/14C04B103/12
CPCC04B40/0039C04B22/148C04B2103/12C04B24/121C04B2103/10Y02W30/91
Inventor 史先伟黄双林朵生君赵宇豪王飞王占东靳宝成刘国庆陈绍华
Owner CHINA RAILWAY FIRST SURVEY & DESIGN INST GRP