Liquid alkali-free accelerator for improving cohesiveness of sprayed concrete and preparation method thereof

A technology of shotcrete and accelerator, which is applied in the field of concrete admixtures and can solve problems such as the inability to effectively reduce the rebound rate of shotcrete.

Inactive Publication Date: 2020-07-07
JIANGSU SOBUTE NEW MATERIALS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] In order to solve the problem that the existing non-alkali quick-setting agent cannot effectively reduce the rebound rate of shotcrete, and at the same time improve the product stability of the liquid non-alkali quick-setting agent, the invention provides a liquid non-alkali quick-setting agent for improving the cohesiveness of shotcrete. Coagulant and preparation method

Method used

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  • Liquid alkali-free accelerator for improving cohesiveness of sprayed concrete and preparation method thereof
  • Liquid alkali-free accelerator for improving cohesiveness of sprayed concrete and preparation method thereof
  • Liquid alkali-free accelerator for improving cohesiveness of sprayed concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The preparation of the liquid alkali-free quick-setting agent that improves the cohesiveness of sprayed concrete comprises the following steps:

[0056] (1) Mix 20g of modified attapulgite and 80g of water, heat to 75°C, and disperse in a disperser with a linear speed of 10m / s. The high-speed dispersion time exceeds 30min. After 2h of reaction, a pre-dispersion solution is obtained A;

[0057] (2) Add 20g of industrial aluminum hydroxide to 50g of 50% dilute sulfuric acid, slowly add 30g of water, heat to 45°C, and react for 1h to obtain mixed solution B;

[0058] (3) 50g of industrial aluminum sulfate octadecahydrate, 3g of triethanolamine, 3g of oxalic acid and 44g of water were mixed and heated to 80°C, and reacted for 2 hours to obtain a mixed solution C;

[0059] (4) Add 20g of mixed solution B to 75g of mixed solution C, heat to 70-75°C, react for 1h, then add 5g of pre-dispersed solution A dropwise to mixed solution B and mixed solution C reactant at a speed of ...

Embodiment 2

[0061] The preparation of the liquid alkali-free quick-setting agent that improves the cohesiveness of sprayed concrete comprises the following steps:

[0062] (1) Mix 25g of modified attapulgite and 75g of water, heat to 75°C, and disperse in a disperser with a linear speed of 15m / s. The high-speed dispersion time exceeds 30min. After 2.5h of reaction, a pre-dispersion is obtained Solution A;

[0063] (2) Add 20g of industrial aluminum hydroxide to 50g of 50% dilute sulfuric acid, slowly add 30g of water, heat to 45°C, and react for 1h to obtain mixed solution B;

[0064] (3) 55g of industrial aluminum sulfate octadecahydrate, 6g of triethanolamine, 3g of oxalic acid, 2g of acetic acid and 34g of water were mixed and heated to 80°C, and reacted for 2 hours to obtain a mixed solution C;

[0065] (4) Add 20g of mixed solution B to 72g of mixed solution C, heat to 70-75°C, react for 1h, then add 8g of pre-dispersed solution A dropwise to mixed solution B and mixed solution C re...

Embodiment 3

[0067] The preparation of the liquid alkali-free quick-setting agent for improving the cohesiveness of sprayed concrete comprises the following steps:

[0068] (1) Mix 15g of modified attapulgite and 85g of water, heat to 75°C, and disperse in a disperser with a linear speed of 10m / s. The high-speed dispersion time exceeds 30min. After 2h of reaction, a pre-dispersion solution is obtained A;

[0069] (2) Add 25g of industrial aluminum hydroxide to 60g of 50% dilute sulfuric acid, slowly add 25g of water, heat to 45°C, and react for 2.0h to obtain mixed solution B;

[0070] (3) Mix 60g of industrial aluminum sulfate octadecahydrate, 5g of triisopropanolamine, 5g of oxalic acid and 30g of water and heat to 85°C, react for 3 hours to obtain mixed solution C;

[0071] (4) Add 20g of mixed solution B to 75g of mixed solution C, heat to 70-75°C, react for 1h, then add 5g of pre-dispersed solution A dropwise to mixed solution B and mixed solution C reactant at a speed of 10mL / min I...

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Abstract

The invention discloses a liquid alkali-free accelerator for improving cohesiveness of sprayed concrete and a preparation method thereof. The preparation method of the liquid alkali-free accelerator comprises the following steps: preparing a pre-dispersed solution A from modified attapulgite and water; preparing a mixed solution B from aluminum hydroxide, a dilute sulfuric acid solution and water;mixing aluminum sulfate, alkylol amine, water and organic acid to obtain a mixed solution C; and adding the mixed solution B into the mixed solution C, and dropwise adding the pre-dispersed solutionA into reactants of the mixed solution B and the mixed solution C at a certain rate to obtain the liquid alkali-free accelerator. The prepared alkali-free setting accelerator can effectively improve the cohesiveness of sprayed concrete, so that the rebound rate of the sprayed concrete is reduced, meanwhile, the product stability can be improved, and the sprayed concrete doped with the liquid alkali-free setting accelerator has high 1d strength and 28d compressive strength ratio of 105% or above.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a liquid alkali-free accelerator for improving the cohesiveness of sprayed concrete and a preparation method thereof. Background technique [0002] Shotcrete is a quick-setting concrete used to strengthen and protect structures or rock surfaces. This technology uses compressed air or other power to inject a mixture of cement, sand, stones and admixtures in a certain proportion to the surface to be sprayed through the nozzle, and within a few minutes Concrete reinforcement formed by internal condensation and hardening. Shotcrete is mainly used for tunnel support, mine excavation, underground powerhouse of water conservancy project, slope fixation and repair and reinforcement projects. [0003] Accelerator is the most important additive in the implementation of shotcrete technology. It has an important impact on the setting time and early strength of shotcrete. The qu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/12C04B22/08C04B103/12
CPCC04B40/0039C04B22/00C04B2103/12C04B22/06C04B22/141C04B22/148C04B24/04C04B24/122
Inventor 冉千平王伟张茜乔敏王雷鸣
Owner JIANGSU SOBUTE NEW MATERIALS
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