Flocculating agent for underwater non-dispersing concrete

A concrete and flocculant technology, applied in the field of concrete admixtures, can solve the problems of large slump loss, low strength, and large water demand of the mixture, and achieve good fluidity

Inactive Publication Date: 2019-07-26
杭州中齐新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used underwater non-dispersible concrete flocculants are mainly divided into polypropylene series and cellulose series. Among them, the underwater non-dispersible concrete mixed with poly

Method used

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  • Flocculating agent for underwater non-dispersing concrete
  • Flocculating agent for underwater non-dispersing concrete

Examples

Experimental program
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Effect test

Embodiment 1

[0016] A flocculant for underwater non-dispersible concrete, consisting of the following parts by weight: 10 parts of grafted modified konjac flour, 8 parts of polyethylene glycol (molecular weight 2000) dilaurate, 10 parts of dispersant, 3 parts of sodium nitrilotriacetate, 3 parts of lithium polystyrene sulfonate, 50 parts of wollastonite.

[0017] The preparation method of the graft modified konjac flour is as follows: (1) mix itaconic acid, N-methylolacrylamide and molecular weight regulator, then add itaconic acid and N-methylolacrylamide total weight 8 1 times the deionized water, stir to dissolve, heat up to 70°C, add the initiator solution dropwise, the initiator solution is added dropwise in 3 hours, and keep warm for 30 minutes to obtain A; (2) add konjac powder to 100 times the deionized water, Use formic acid to adjust the pH value to 4, stir and heat up to 70°C to obtain B; (3) Mix the above two products evenly at a mass ratio of 1:2, adjust the temperature to 70°...

Embodiment 2

[0023] A flocculant for underwater non-dispersible concrete, consisting of the following parts by weight: 30 parts of grafted modified konjac flour, 3 parts of polyethylene glycol (molecular weight 5000) dilaurate, 20 parts of dispersant, 1 part of sodium nitrilotriacetate, 8 parts of lithium polystyrene sulfonate, and 20 parts of wollastonite.

[0024] The preparation method of the grafted modified konjac flour is as follows: (1) mix itaconic acid, N-methylolacrylamide and molecular weight regulator, then add itaconic acid and N-methylolacrylamide total weight 15 1 times the amount of deionized water, stirred and dissolved, heated up to 50°C, added dropwise the initiator solution, the initiator solution was added dropwise after 4 hours, and kept for 30 minutes to obtain A; (2) konjac powder was added to 50 times the amount of deionized water, Use oxalic acid to adjust the pH value to 6, stir and heat up to 50°C to obtain B; (3) Mix the above two products evenly at a mass rati...

Embodiment 3

[0030] A flocculant for underwater non-dispersible concrete, consisting of the following parts by weight: 20 parts of grafted modified konjac flour, 5 parts of polyethylene glycol (molecular weight 4000) dilaurate, 15 parts of dispersant, 2 parts of sodium nitrilotriacetate, 5 parts of lithium polystyrene sulfonate, and 30 parts of wollastonite.

[0031] The preparation method of the grafted modified konjac flour is as follows: (1) mix itaconic acid, N-methylolacrylamide and molecular weight regulator, then add itaconic acid and N-methylolacrylamide total weight 12 times the amount of deionized water, stir to dissolve, heat up to 60°C, add the initiator solution dropwise, the initiator solution is added dropwise in 3.5 hours, and keep warm for 30 minutes to obtain A; (2) add konjac powder to 80 times the amount of deionized water , adjust the pH value to 5 with p-toluenesulfonic acid, stir and heat up to 60°C to obtain B; (3) Mix the above two products evenly according to the ...

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Abstract

The invention belongs to the technical field of concrete additives, and discloses a flocculating agent for underwater non-dispersing concrete. The flocculating agent comprises, by weight, 10-30 partsof grafting modified konjaku flour, 3-8 parts of polyethylene glycol (2000-5000) bislaurate, 10-20 parts of dispersing agents, 1-3 parts of trisodium nitrilotriacetate, 3-8 parts of lithium polystyrene sulfonate and 20-50 parts of wollastonite. By the aid of the flocculating agent, blended concrete is rich in viscosity and has good flowability and can automatically level and compact after being poured into underwater space.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a flocculant for underwater non-dispersible concrete. Background technique [0002] When the ordinary concrete mixture is poured into water, the aggregate will be separated from the cement due to the flushing effect of the water, and part of it will be taken away by the water, losing the ability to cement the aggregate. Underwater non-dispersible concrete is to add flocculant-based admixtures to the concrete, between cement particles, between cement and aggregate, through the "bridge" effect of the long polymer chain of flocculant, so that the mixing It can form a stable spatial flexible network structure, improve the cohesion of concrete, limit the dispersion and segregation of concrete, and avoid cement loss. Underwater non-dispersible concrete is still in the development stage in our country. It is a relatively young and new type of structural engineering material...

Claims

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Application Information

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IPC IPC(8): C04B24/38
CPCC04B40/0039C04B24/38C04B24/283C04B24/12C04B24/16C04B22/14C04B24/04C04B24/124C04B2103/302
Inventor 王颖
Owner 杭州中齐新材料科技有限公司
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