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Preparation method of low-alkaline liquid accelerating agent

A technology of quick-setting agent and liquid, which is applied in the field of preparation of low-alkali liquid quick-setting agent, which can solve the problems of obvious differences in mineral composition and affect the use of shotcrete, and achieve the effect of meeting the setting time requirements and good cement adaptability

Active Publication Date: 2010-03-10
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The effect of quick-setting agent is closely related to the mineral components and content in cement. However, the production of cement is affected by many factors such as raw materials and production processes, and the mineral composition varies significantly.
In China, ordinary Portland cement can contain no more than 20% inactive admixtures, and there are many types of admixtures, so the cement adaptability of liquid accelerators is very prominent, affecting its use in shotcrete

Method used

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  • Preparation method of low-alkaline liquid accelerating agent
  • Preparation method of low-alkaline liquid accelerating agent
  • Preparation method of low-alkaline liquid accelerating agent

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0030] Dissolve 25 parts of solid sodium hydroxide into 43 parts of water, then add 32 parts of aluminum hydroxide to it at 80°C (the molar ratio of sodium hydroxide to aluminum hydroxide is 1.4), and react for 6 hours to obtain Al 2 o 3 Liquid sodium aluminate E-1 at a content of 20%. The reaction vessel is a three-necked flask with a thermometer and a reflux device.

preparation Embodiment 2

[0032] Dissolve 25 parts of solid sodium hydroxide into 30 parts of water, then add 45 parts of aluminum hydroxide to it at 100°C (the molar ratio of sodium hydroxide to aluminum hydroxide is 1.1), and react for 4 hours to obtain Al 2 o 3 30% liquid sodium aluminate E-2. The reaction vessel is a three-necked flask with a thermometer and a reflux device

preparation Embodiment 3

[0034] Dissolve 25 parts of solid sodium hydroxide into 33 parts of water, then add 42 parts of aluminum hydroxide to it at 130°C (the molar ratio of sodium hydroxide to aluminum hydroxide is 1.1), and react for 2 hours to obtain Al 2 o 3 Liquid sodium aluminate E-2. with a content of 27.5%. The reaction vessel is a three-necked flask with a thermometer and a reflux device

[0035] Table 1: Liquid Sodium Aluminate E1-E3

[0036]

[0037] 2. Liquid sodium aluminate modification

[0038] Configure sodium aluminate sodium silicate mixed solution according to Table 2

[0039] Table 2. Mixed solution of sodium silicate and sodium carbonate

[0040]

[0041] Liquid sodium aluminate modified embodiment 1

[0042] Under high shear stirring (1000S -1 ) state slowly add 50 parts of liquid sodium aluminate (E1) into 20 parts of H1 solution. When the gel appears, add 25 parts of water, continue to add the remaining liquid sodium aluminate solution after the gel dissolves, and c...

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Abstract

The invention relates to a preparation method of low-alkaline liquid accelerating agent, comprising the following steps: 1) preparing sodium aluminate liquid; 2) modifying sodium aluminate liquid; 3)carrying out a reaction between the modified sodium aluminate and the aluminum sulfate; and 4) adding hydramine and hydroxycarboxylic acid and stirring evenly to prepare the finished product. The low-alkaline liquid accelerating agent prepared by the invention has low alkali content, namely, the sum of Na2O and K2O is less than 5%, low preparation cost, is suitable for cement such as ordinary Portland cement, moderate-heat cement, low-heat cement and other brands and types, is applicable to the sprayed concrete construction, can significantly improve initial strength and ensure later strength.

Description

Technical field [0001] The invention relates to a method for preparing a low-alkali liquid accelerating agent. The prepared low-alkali liquid accelerating agent is suitable for wet shotcrete. Background technique [0002] Shotcrete has many advantages in underground construction and rock support, and has become a very important and necessary measure in modern underground engineering. With the development of wet mix shotcrete technology, the scope of use of shotcrete in underground engineering has been greatly expanded. The most important function of liquid accelerator for sprayed concrete is to accelerate the setting of the concrete mixture and improve the early strength, which can increase the thickness of the sprayed layer and shorten the interval between spraying the next layer. [0003] Traditional shotcrete accelerators generally include alkali metal aluminates, carbonates, silicates and other substances. Since these substances are highly alkaline, they often cause ma...

Claims

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Application Information

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IPC IPC(8): C04B24/12C04B103/12
CPCC04B2103/14C04B24/122
Inventor 刘加平张建纲冉千平缪昌文周伟玲
Owner JIANGSU SOBUTE NEW MATERIALS
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