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Non-dispersible underwater concrete additive, preparation method, and application thereof

A concrete admixture and dispersion technology, which is applied in the field of concrete, can solve problems such as over-mixing, viscosity reduction, and increase in the viscosity of concrete mixtures, so as to avoid strength loss, increase cohesion, and improve work performance. Effect

Active Publication Date: 2017-07-14
CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there have been related reports at home and abroad about the admixture with anti-dispersion properties. This admixture is mainly composed of flocculants and auxiliary agents. The addition of flocculants mainly improves the viscosity of cement paste, and most of them are water-soluble cellulose. The main function of ethers and water-soluble acrylic polymers is to increase the viscosity of the concrete mixture; whether it is water-soluble cellulose ether or water-soluble acrylic acid, polyacrylamide and other linear polymers at high The viscosity decreases significantly under the ion concentration, and it is prone to over-mixing, and it will dehydrate under dry conditions and shrink in volume, resulting in large shrinkage of concrete and other shortcomings. The water consumption, increase the strength, improve the fluidity of concrete and reduce the amount of flocculant, the auxiliary agent is mainly composed of water reducer, which needs to have good compatibility with the flocculant, but there is no information about its system ratio Detailed study

Method used

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  • Non-dispersible underwater concrete additive, preparation method, and application thereof
  • Non-dispersible underwater concrete additive, preparation method, and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032]An underwater non-dispersible concrete admixture, which consists of: modified flocculant solution XN-1 with a mass fraction of about 1%, polycarboxylate water reducer A, polycarboxylate water reducer B, polyether dispersant Foaming agent prevol 544x and air-entraining agent AE-II, the composition is calculated by mass percentage: modified flocculant solution 87%, polycarboxylate water reducer 8%, polycarboxylate water reducer 4%, defoaming 0.6% air-entraining agent and 0.4% air-entraining agent; gradually add the above components into the reaction kettle according to the proportion, and stir evenly to obtain the underwater non-dispersible concrete admixture W-1.

[0033] Wherein, the modified flocculant solution XN-1 is prepared by adding 100 g of deionized water and 15 g of acrylamide Monomer, 0.65g of N,N'-methylenebisacrylamide, stir until the monomer is completely dissolved, and pass nitrogen gas to replace the air in the flask; then heat to 40°C, add 0.1g of ammoniu...

Embodiment 2

[0035] An underwater non-dispersible concrete admixture, which consists of: modified flocculant solution XN-2 with a mass fraction of about 1%, polycarboxylate water reducer A, polycarboxylate water reducer B, polyether dispersant The composition of foam agent prevol 544x and air-entraining agent AE-II is calculated by mass percentage: modified flocculant solution 84%, polycarboxylate water reducer A 10%, polycarboxylate water reducer B 5%, disinfectant 0.3% foaming agent, 0.7% air-entraining agent; gradually add the above components into the reaction kettle according to the proportion, and stir evenly to obtain the underwater non-dispersible concrete admixture W-2.

[0036] Wherein, the modified flocculant solution XN-2 is prepared by adding 100 g of deionized water and 15 g of acrylamide Monomer, 0.3g of N,N'-methylenebisacrylamide, stirred until the monomer is completely dissolved. Introduce nitrogen to replace the air in the flask; heat to 40°C, then add 0.1g of ammonium ...

Embodiment 3

[0038] An underwater non-dispersible concrete admixture, which consists of: modified flocculant solution XN-3 with a mass fraction of about 1%, polycarboxylate water reducer A, polycarboxylate water reducer B, polyether dispersant Foaming agent prevol 544x and air-entraining agent AE-II, the composition is calculated by mass percentage: modified flocculant solution 85%, polycarboxylate water reducer A9%, polycarboxylate water reducer B 5%, disinfectant 0.4% foaming agent, 0.6% air-entraining agent; gradually add the above components into the reaction kettle, and stir evenly to obtain the underwater non-dispersible concrete admixture W-3.

[0039] Wherein, the modified flocculant solution XN-3 is prepared by adding 100 g of deionized water and 15 g of acrylamide Monomer, 0.25g of diacryloylpiperazine, stirred until the monomer is completely dissolved. Introduce nitrogen to replace the air in the flask; heat to 40°C, then add 0.12g of ammonium persulfate and 0.08g of ascorbic a...

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Abstract

The invention discloses a non-dispersible underwater concrete additive, which mainly includes a modified flocculating agent solution, a polycarboxylate water reducing agent A, a polycarboxylate water reducing agent B, a defoamer and an air entraining agent according to the following ratio, by mass, 75-93% of the modified flocculating agent solution, 5-12% of the polycarboxylate water reducing agent A, 2-10% of the polycarboxylate water reducing agent B, 0.02-0.6% of the defoamer, and 0.01-0.5% of the air entraining agent. The additive can effectively improve cohesiveness of the underwater concrete, guarantees strength of the concrete in an underwater environment, and effectively improve workability of the concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete, and in particular relates to an underwater non-dispersible concrete admixture and a preparation method and application thereof. Background technique [0002] The research and application of underwater non-dispersible concrete has a history of more than 40 years. It has played a huge role in water conservancy, bridges, ocean engineering and other fields, and has become an eye-catching professional technology in modern concrete construction technology. Although cement is a hydraulic material, if the concrete mixture is placed directly in the water environment, due to the washing effect of water, the aggregate will be separated from the cement, part will be taken away by water, and part will be in a suspended state for a long time, causing the cement to lose The ability of cementing aggregates is impaired, so the concrete mixture poured directly in water will generally have separation of slurry and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/32C04B24/42C04B24/16C04B24/26C08F283/06C08F220/06C08F228/02C08F220/28C08F220/56C04B103/30
CPCC04B24/165C04B24/2652C04B40/0039C04B2103/302C08F220/56C08F283/065C04B24/32C04B2103/304C08F220/281
Inventor 黄汉洋赵日煦杨文吴雄
Owner CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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