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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 limited popularization and use, and achieve the effects of improving construction performance, reducing the highest heat peak, capillary porosity and pore size

Active Publication Date: 2012-09-19
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] Example 1 (Preparation of 1000kg powder composition 1)

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

Embodiment 2

[0060] Example 2 (Preparation of 500L liquid composition 1)

[0061] Add 112.5kg of deionized water into a 600-1000L reactor, heat to 30℃~38℃, start the mixer and add 50kg of aluminum sulfate to fully dissolve it, then add polycarboxylate emulsion (solid content is 40%, purchase From Sichuan Juxing Science and Technology Application Research Institute, product model JX-GBNHY) 200kg, lithium carbonate 125kg, stir for 5-10 minutes after adding, then add 10kg of triethanolamine, finally add 2.5kg of rosin thermopolymer, and stir for 3-8 minutes. The liquid composition 1 of the present invention was prepared. Calculated by weight percentage, liquid composition 1 contains: 40% polycarboxylate emulsion; 10% aluminum sulfate; 25% lithium carbonate; 0.5% rosin thermopolymer; 2% triethanolamine; and 22.5% Deionized water.

Embodiment 3

[0062] Example 3 (Preparation of 1000kg powder composition 2 with retarding property)

[0063] Add 467kg of calcium aluminate powder into a 1500L blender, start the blender, add 200kg of calcium sulfate, 150kg of polycarboxylic acid (purchased from Sichuan Juxing Technology Application Research Institute, product model JX-GBG), 150kg of lithium carbonate, and glucose 25kg of sodium and 8kg of triterpene saponins, and continue to stir for 5-10 minutes after the addition, to obtain the powder composition 2 of the present invention. Calculated by weight percentage, powder composition 2 contains: 15% polycarboxylic acid; 46.7% calcium aluminate; 15% lithium carbonate; 2.5% sodium gluconate; 0.8% triterpene saponin; and 20% 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 metalions 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 specifically 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 structures such as cement and admixtures and the alkali in the environment and the alkali active minerals in the aggregate occur slowly in a humid environment and cause concrete cracking and destruction. Alkali aggregate reactions include alkali-silicic acid reactions and alkali-carbonate reactions. If the aggregate (ie, aggregate) contains active aggregates such as amorphous silica, when there is water in the concrete, it can interact with the alkali (K 2 O and Na 2 O) It works to produce an alkali-aggregate reaction, causing concrete damage. [0003] Alkali-aggregate reaction (mainly alkali-silicic acid reaction) is one of the important reasons leading to the...

Claims

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Application Information

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