Composition for inhibiting concrete alkali aggregate reaction and preparation thereof

A technology of composition and alkali aggregate, which is applied in the field of concrete engineering, can solve the problems of restricting popularization and use, and achieve the effects of improving construction performance, reducing shrinkage, and reducing the highest heat peak

Active Publication Date: 2009-05-27
苏笮斌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high price of lithium salts limits the widespread use of this method

Method used

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  • Composition for inhibiting concrete alkali aggregate reaction and preparation thereof
  • Composition for inhibiting concrete alkali aggregate reaction and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Embodiment 1 (preparation of 1000kg powder composition 1)

[0059] Add 495kg of calcium aluminate (300 mesh) powder into a mixer with a volume of 1500L, start the mixer, and add 100kg of calcium sulfate (500 mesh), 200kg of lithium hydroxide, and polycarboxylate (purchased from Sichuan Giant Star Science and Technology Application Research Institute) in sequence. , product model JX-GBNHG) 200kg, triterpenoid saponin 5kg, after adding, continue to stir for 5 to 10 minutes to obtain the powder composition 1 of the present invention. Calculated by weight percentage, powder composition 1 comprises: 20% polycarboxylate; 49.5% calcium aluminate; 20% lithium hydroxide; 0.05% triterpene saponin;

Embodiment 2

[0060] Embodiment 2 (preparation of 500L liquid composition 1)

[0061] Add 112.5kg of deionized water into a 600-1000L reaction kettle, heat up to 30°C-38°C, start the mixer and add 50kg of aluminum sulfate to fully dissolve it, then add polycarboxylate emulsion (solid content is 40%, purchased From Sichuan Juxing Science and Technology Application Research Institute, product model JX-GBNHY) 200kg, lithium carbonate 125kg, add and stir for 5-10 minutes, then add triethanolamine 10kg, finally add rosin thermal polymer 2.5kg, and stir for 3-8 minutes, That is, the liquid composition 1 of the present invention was prepared. Calculated by weight percentage, liquid composition 1 comprises: 40% polycarboxylate emulsion; 10% aluminum sulfate; 25% lithium carbonate; 0.5% rosin thermal polymer; 2% triethanolamine; Deionized water.

Embodiment 3

[0062] Embodiment 3 (preparation 1000kg has retarding powder composition 2)

[0063] Add 467kg of calcium aluminate powder into a mixer with a volume of 1500L, start the mixer, add 200kg of calcium sulfate, polycarboxylate (purchased from Sichuan Giant Star Science and Technology Application Research Institute, product model JX-GBG) 150kg, lithium carbonate 150kg, glucose 25 kg of sodium bicarbonate and 8 kg of triterpene saponins, and continue stirring for 5 to 10 minutes after the addition is complete, to obtain the powder composition 2 of the present invention. Calculated by weight percentage, powder composition 2 comprises: 15% polycarboxylic acid; 46.7% calcium aluminate; 15% lithium carbonate; 2.5% sodium gluconate; 0.8% triterpene saponin; Calcium sulfate.

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Abstract

The invention belongs to the technical field of concrete engineering, and in particular relates to a composition for inhibiting concrete alkali-aggregate reaction and a preparation method thereof. The composition for inhibiting the concrete alkali-aggregate reaction comprises the following compositions: 10 to 50 percent of plasticizing agent, 10 to 70 percent of aluminate and 10 to 30 percent of alkali metal salt or alkaline-earth metal salt, wherein the alkali metal salt or the alkaline-earth metal salt is selected from at least one group of lithium compounds, barium compounds or calcium-magnesium compounds, and the total content of various compositions is 100 percent. The composition can cover or coat active elements of aggregate, prevent or isolate contact reaction between alkali metal ions such as K<+> and Na<+> and the active elements of the aggregate, prevent generation of soluble swelled gel and generation of insoluble compounds, and further eliminate alkali-aggregate reaction and improve the durability of concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete engineering, and in particular relates to a composition for inhibiting concrete alkali-aggregate reaction and a preparation method thereof. Background technique [0002] Alkali-aggregate reaction refers to the expansion reaction in which concrete constituents such as cement and admixtures and alkali in the environment and alkali-active minerals in aggregates slowly occur in a humid environment and cause concrete cracking and damage. Alkali-aggregate reactions include alkali-silicic acid reactions and alkali-carbonate reactions. If the aggregate (that is, the aggregate) contains active aggregates such as amorphous silica, when there is moisture in the concrete, it can react with the alkali in the cement (K 2 O and Na 2 O) works, produces alkali-aggregate reaction, and destroys the concrete. [0003] Alkali-aggregate reaction (mainly refers to the alkali-silicic acid reaction) is one of the impo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/00C04B24/00
CPCC04B2111/2023C04B2103/0008C04B2103/0011C04B40/0039
Inventor 苏笮斌
Owner 苏笮斌
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