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Preparation of concrete accelerator

A technology of quick-setting agent and shotcrete, applied in the field of quick-setting agent, can solve problems such as unpleasant working atmosphere, and achieve the effect of good final strength, good working environment and rapid hardening

Inactive Publication Date: 2008-01-23
CONSTR RES & TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also means that their use in confined spaces like tunnels creates a very unpleasant working atmosphere

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0031] Accelerators are prepared according to the invention.

[0032] The weight ratios used were as follows:

Embodiment 1      Embodiment 2     Embodiment 3

[0034] 17% aluminum sulfate 46% 48% 40%

[0035] Amorphous aluminum hydroxide 18% 18% 18%

[0036] Water 30% 28% 28%

[0037] Diethanolamine (90% solution) 6% 6% 4%

[0038] Dissolve diethanolamine in water, then dissolve aluminum sulfate in this solution. This can be done by heating the solution to 50-60°C and stirring while adding until a clear solution is obtained. To the heated and stirred solution was gradually added aluminum hydroxide and stirred until a clear solution was obtained.

Embodiment 4

[0040] Use this method and use the material of embodiment 1-3 to prepare quick-setting agent, just the amount of water is reduced to 28.7%, and added 1.3% palm citric acid monohydrate. The addition of citric acid monohydrate was performed after the addition of the aluminum hydroxide and the solution was cooled to room temperature before the addition. A clear solution was obtained.

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PUM

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Abstract

An alkali-free accelerator for sprayed concrete is prepared by dissolving aluminium sulphate in water and amorphous aluminium hydroxide in water optionally containing amine, and optionally adding at least one stabiliser, selected from hydroxycarboxylic acids and phosphoric acids and non-alkaline salts thereof, and at least one defoaming agent.

Description

technical field [0001] The present invention relates to a cementitious composition and an accelerator used therein, especially an accelerator for sprayed concrete, and a preparation method thereof. Background technique [0002] The application of concrete to substrates by spraying nozzles (commonly known as "shotcrete") is a conventional technique and is widely used in applications such as tunnel linings. It is important for shotcrete to set quickly on the substrate and this can be achieved by adding accelerators to the concrete at the nozzle. These accelerators are very different from those used in ordinary concrete and generally include such substances as alkali metal hydroxides, aluminates and silicates. [0003] The strong alkalinity of these materials presents handling problems. It also means that their use in confined spaces like tunnels creates a very unpleasant working atmosphere. Recent efforts to avoid such substances include the use of aluminum compounds, typic...

Claims

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Application Information

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IPC IPC(8): C04B22/14C04B103/10C04B22/06C04B22/16C04B24/06C04B24/12C04B28/02C04B40/00C04B103/14C04B103/50
CPCC04B2111/00146C04B28/02C04B22/148C04B2103/10C04B40/0039C04B14/303C04B22/16C04B24/121C04B2103/50C04B24/06
Inventor T·霍夫曼
Owner CONSTR RES & TECH GMBH