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A kind of underwater concrete anti-dispersion agent and preparation method thereof

An underwater concrete and anti-dispersant technology, applied in the field of concrete admixtures, can solve problems such as high content of suspended substances, low compressive strength ratio, unstable product performance, etc., achieve good social and economic benefits, reduce production costs, good overall performance

Active Publication Date: 2021-07-20
BEIJING BUILDING MATERIALS ACADEMY OF SCI RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Including the products involved in the above patents and many other underwater concrete anti-dispersant products on the market, in actual use, there are generally low water / land compressive strength ratios, high content of suspended matter, and the amount of anti-dispersant in concrete. Large and other disadvantages. At the same time, most of the existing anti-dispersant preparation processes are based on the combination of tackifier and water reducer, and the product performance is unstable.

Method used

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  • A kind of underwater concrete anti-dispersion agent and preparation method thereof
  • A kind of underwater concrete anti-dispersion agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] A preparation method of underwater concrete anti-dispersion agent (code name N1), comprising the steps of:

[0026] Step 1: Under an argon atmosphere, dissolve 100 parts of acrylamide and 20 parts of ethyleneimine organic monomer into 12 parts of iron oxide sol, keep the organic-inorganic reaction system at a constant temperature of 70°C, add 0.02 parts of urea and stir to mix 30min.

[0027] Step 2: Slowly add a mixed solution of 0.02 part of ammonium persulfate and 0.01 part of sodium hypophosphite into the above sol dropwise to initiate the polymerization of the organic monomer, and react for 4 hours.

[0028] Step 3: Seal the reaction solution and let it rest for 5 hours to obtain a polymer gel.

[0029] Step 4: Dry the gel in a vacuum drying oven at 45°C to constant weight, and grind it into powder to obtain underwater concrete anti-dispersion agent N1.

Embodiment 2

[0031] A preparation method of underwater concrete anti-dispersion agent (code name N2), comprising the steps of:

[0032] Step 1: Under nitrogen atmosphere, dissolve 160 parts of acrylamide and 10 parts of ethyleneimine organic monomer into 15 parts of aluminum hydroxide sol, keep the organic-inorganic reaction system at a constant temperature of 60°C, add 0.015 parts of urea and stir to mix 35min.

[0033] Step 2: slowly drop a mixed solution of 0.02 parts of ammonium persulfate and 0.01 parts of sodium bisulfite into the above sol to initiate the polymerization of organic monomers, and react for 5 hours.

[0034] Step 3: Seal the reaction solution and let it rest for 4.5 hours to obtain a polymer gel.

[0035] Step 4: Dry the gel in a vacuum drying oven at 55°C until constant weight, and grind it into powder to obtain the underwater concrete anti-dispersion agent N2.

Embodiment 3

[0037] A preparation method of underwater concrete anti-dispersion agent (code name N3), comprising the steps of:

[0038] Step 1: Under a nitrogen atmosphere, dissolve 100 parts of acrylic acid and 60 parts of N-methylolacrylamide organic monomer into 20 parts of aluminosilicate sol, keep the organic-inorganic reaction system at a constant temperature of 80°C, and add 0.02 parts Urea was stirred and mixed for 40 minutes.

[0039] Step 2: Slowly add a mixed solution of 0.01 part of ammonium persulfate, 0.01 part of potassium persulfate and 0.01 part of sodium hypophosphite dropwise into the above sol to initiate the polymerization of the organic monomer, and react for 6 hours.

[0040] Step 3: Seal the reaction solution and let it rest for 5 hours to obtain a polymer gel.

[0041] Step 4: Dry the gel in a vacuum drying oven at 55°C until constant weight, and grind it into powder to obtain the underwater concrete anti-dispersion agent N3.

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Abstract

The invention relates to an anti-dispersant agent for underwater concrete and a preparation method thereof. The anti-dispersant agent for underwater concrete is prepared by chemical synthesis reaction using organic monomer and inorganic sol as raw materials, and the organic monomer is selected from acrylamide , sodium acrylate, N-methylolacrylamide, ethyleneimine, acrylic acid and methacrylic acid, and the inorganic sol is selected from silicon oxide colloid, aluminum oxide colloid, iron oxide One or more of colloids, aluminum hydroxide colloids, iron hydroxide colloids, magnesium hydroxide colloids and aluminum silicate colloids. The underwater concrete anti-dispersant agent of the present invention has a 7d water-to-land compressive strength ratio of ≥72%, a 28d water-to-land compressive strength ratio of ≥87%, a suspension content of ≤90mg / L, and superior product performance. At the same time, the amount of the anti-dispersion agent is small, and when the dosage is 0.25%, good anti-dispersion can be achieved, which is far lower than that of existing similar products, and the production cost of underwater concrete can be reduced.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to an anti-dispersion agent for underwater concrete and a preparation method thereof. Background technique [0002] During the pouring process of underwater concrete, affected by factors such as water dilution and running water erosion, the quality of the concrete body cannot meet the engineering requirements, and additional unconventional methods such as cofferdam drainage, immersed tube and conduit construction are required, which not only increases the difficulty of construction, The progress of the project was also delayed. The anti-dispersion agent for underwater concrete is a special admixture for underwater concrete pouring engineering, which can realize the self-compacting of concrete underwater, and has good underwater anti-dispersion properties, and can inhibit the separation of cement and aggregate during underwater operations without affecting the constructio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F292/00C08F220/56C08F226/02C08F220/58C08F220/06C04B24/26C04B103/40
CPCC04B24/2652C04B2103/408C08F292/00C08F220/56C08F226/02C08F220/06C08F220/58
Inventor 涂玉波陈旭峰房桂明王卉李沙李润丰
Owner BEIJING BUILDING MATERIALS ACADEMY OF SCI RES