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Durable alkali-free liquid setting accelerator and preparation method thereof

A technology of quick-setting agent and durability, which is applied in the field of alkali-free liquid quick-setting agent and its preparation, and can solve problems such as adverse effects on concrete durability

Active Publication Date: 2015-03-25
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

The application of a large amount of aluminum sulfate can promote the hydration of cement to a certain extent, but the introduction of sulfur trioxide at the same time makes the content of sulfur trioxide in the cement exceed the standard. adversely affect the durability of the

Method used

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  • Durable alkali-free liquid setting accelerator and preparation method thereof
  • Durable alkali-free liquid setting accelerator and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Preparation of modified aluminum hydroxide sol

[0028] Add 700 g of 15 mol / L concentrated ammonia water dropwise to 300 g of amorphous aluminum hydroxide with an alumina content of 63.5%, dropwise for 35 minutes, and keep the temperature in a water bath at 80°C until the aluminum hydroxide precipitates and disperses to obtain a stable transparent aluminum hydroxide sol.

[0029] (2) Preparation of modified silica sol

[0030] Mix 2g of silica sol with a silica content of 27% and 40g of 12 C silane coupling agent in 158g of aqueous solution, stir in a constant temperature water bath at 60°C for 2 hours, and prepare a modified silica sol solution;

[0031] (3) Preparation of modified alcohol amine

[0032] With 100g triethanolamine and 50.3g glycolic acid (the molar ratio of triethanolamine and glycolic acid is 1:1)

[0033] React in a constant temperature water bath at 75°C for 3 hours, and cool to obtain a modified alcoholamine.

[0034] (4) Add the following co...

preparation Embodiment 2

[0042] (1) Preparation of modified aluminum hydroxide sol

[0043] Add 800 g of 18 mol / L concentrated ammonia water dropwise to 200 g of amorphous aluminum hydroxide with an alumina content of 65%, for a period of 45 minutes, and keep the temperature in a water bath at 85°C until the aluminum hydroxide precipitates and disperses to obtain a stable transparent aluminum hydroxide sol.

[0044] (2) Preparation of modified silica sol

[0045] Mix 4g of silica sol with a silica content of 28% and 80g of 12 C silane coupling agent in 116g of aqueous solution, stir in a constant temperature water bath at 55°C for 2 hours, and prepare a modified silica sol solution;

[0046] (3) Preparation of modified alcohol amine

[0047] With 50g triethanolamine and 50.3g glycolic acid (the molar ratio of triethanolamine and glycolic acid is 1:2) in

[0048] React in a constant temperature water bath at 80°C for 2.5 hours, and cool to obtain the modified alcoholamine.

[0049] (4) Add the follo...

preparation Embodiment 3

[0057] (1) Preparation of modified aluminum hydroxide sol

[0058] In 100g of amorphous aluminum hydroxide with an alumina content of 60%, 900g of 20mol / L concentrated ammonia water was added dropwise for 60 minutes, and the temperature was kept constant in a water bath of 85°C until the aluminum hydroxide was precipitated and dispersed to obtain a stable transparent aluminum hydroxide sol.

[0059] (2) Preparation of modified silica sol

[0060] Mix 6g of silica sol with a silica content of 27% and 120g of 18C silane coupling agent in 74g of aqueous solution, stir in a constant temperature water bath at 60°C for 3 hours, and prepare a modified silica sol solution;

[0061] (3) Preparation of modified alcohol amine

[0062] 50g triethanolamine and 75.5g glycolic acid (the molar ratio of triethanolamine and glycolic acid is 1:3) in

[0063] React in a constant temperature water bath at 75°C for 3 hours, and cool to obtain the modified alkanolamine.

[0064] (4) Add the followi...

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Abstract

The invention discloses a durable alkali-free liquid setting accelerator and a preparation method thereof. The durable alkali-free liquid setting accelerator is prepared from the following components in percentage by mass: 20%-28% of aluminum hydroxide sol, 10%-16% of modified silica sol, 5%-9% of modified alcohol amine, 4%-6% of cellulose fiber, 1%-3% of a stabilizer and 40%-60% of water. The preparation method comprises the following specific steps: (1) preparing the aluminum hydroxide sol; (2) preparing the modified silica sol; (3) preparing modified alcohol amine; and (4) adding reinforced fiber, the stabilizer and water, and stirring for 4-6 hours at 75-85 DEG C to obtain the finished product. The liquid setting accelerator is free of sulfate ions, alkali metal ions, chloride ions and other corrosive substances, a stable solution system is prepared and no phenomenon of layering is caused after the liquid setting accelerator is stored for above 6 months at normal temperature, the cost is low and the long-term strength has almost no loss and when applied in construction of shotcrete, the liquid setting accelerator plays a positive role to improve the durability of concrete.

Description

technical field [0001] The invention relates to an alkali-free liquid accelerator and a preparation method thereof, in particular to a durable alkali-free liquid accelerator free of sulfate ions, alkali metal ions, chloride ions and other corrosive substances and a preparation method thereof . Background technique [0002] Accelerator is an essential admixture component in shotcrete. Its main purpose is to accelerate the setting time of concrete mixture, reduce rebound, improve early strength, and meet the construction requirements of special projects. [0003] At present, most of the alkaline powder accelerators are used in our country, and its main components are sodium silicate, sodium aluminate and sodium carbonate. Although it can meet the index requirements of quick-setting concrete, it has many defects, such as strong corrosion, which seriously affects the later strength and durability of concrete, poor cohesion of slurry, which leads to increased rebound of shotcret...

Claims

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Application Information

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IPC IPC(8): C04B24/12C04B22/06
Inventor 仇影丁蓓
Owner JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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