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Polycarboxylate water reducer for ultra-compact concrete for nuclear power and preparation method of polycarboxylate water reducer

A water reducing agent, ultra-dense technology, applied in the field of ultra-dense concrete polycarboxylate water reducer for nuclear power and its preparation, can solve complex components, adverse effects on concrete mechanical properties and durability, polycarboxylate water reducer Problems such as adsorption-dispersibility and dispersion retention, to achieve the effect of improving fluidity, improving self-compacting property, reducing equipment investment cost and energy consumption cost

Inactive Publication Date: 2016-02-17
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The various components contained in the technical solution published by the above-mentioned patents are complex, and various substances will not only affect the adsorption-dispersibility and dispersion retention of polycarboxylate superplasticizers, but also affect the mechanical properties and durability of concrete. and so on cause adverse effects, so further improvement is required

Method used

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  • Polycarboxylate water reducer for ultra-compact concrete for nuclear power and preparation method of polycarboxylate water reducer

Examples

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Comparison scheme
Effect test

Embodiment 1

[0040] A polycarboxylate superplasticizer for nuclear power ultra-dense concrete, comprising the following components and parts by weight per 100 parts:

[0041] Dispersed ether polycarboxylate superplasticizer: 50 parts

[0042] Slump-preserving ether polycarboxylate superplasticizer: 20 parts

[0043] Sodium gluconate: 5 parts

[0044] Polyether modified silicone defoamer: 0.05 parts

[0045] Hydroxypropyl methylcellulose: 2 parts

[0046] Triethanolamine: 1 part

[0047] Sodium nitrite: 0.3 parts

[0048] water: balance

[0049] Among them, the dispersed ether polycarboxylate water reducer is prepared by the following method:

[0050] Add 180 g of TPEG macromonomer and 180 g of water into the reactor equipped with a stirring device at normal temperature, turn on the stirring device, and stir until the TPEG macromonomer is completely dissolved. Add 2.5 g of ammonium persulfate, 1 g of hydrogen peroxide (purity: 35%), and 3.3 g of acrylic acid to the reaction system, and...

Embodiment 2

[0054] A polycarboxylate superplasticizer for nuclear power ultra-dense concrete, comprising the following components and parts by weight per 100 parts:

[0055] Dispersed ether polycarboxylate water reducer: 52 parts

[0056] Slump-preserving ether polycarboxylate superplasticizer: 25 parts

[0057] Sodium gluconate: 3 parts

[0058] Polyether defoamer: 0.01 parts

[0059] Sodium tripolyphosphate: 3 parts

[0060] Triisopropanolamine: 1.5 parts

[0061] Sodium nitrite: 0.2 parts

[0062] water: balance

[0063] Among them, the dispersed ether polycarboxylate water reducer is prepared by the following method:

[0064] Add 180 g of TPEG macromonomer and 230 g of water into the reactor equipped with a stirring device at normal temperature, turn on the stirring device, and stir until the TPEG macromonomer is completely dissolved. Add 4 g of hydrogen peroxide (purity: 35%) and 2.3 g of maleic anhydride to the reaction system, and continue to fully stir the reaction system. ...

Embodiment 3

[0068] A polycarboxylate superplasticizer for nuclear power ultra-dense concrete, comprising the following components and parts by weight per 100 parts:

[0069] Dispersed ether polycarboxylate superplasticizer: 55 parts

[0070] Slump-preserving ether polycarboxylate superplasticizer: 20 parts

[0071] Cane sugar: 5 parts

[0072] Polyether defoamer: 0.05 parts

[0073] Hydroxypropyl methylcellulose: 1 part

[0074] Triisopropanolamine: 1 part

[0075] Methylparaben: 0.2 parts

[0076] water: balance

[0077] Among them, the dispersed ether polycarboxylate water reducer is prepared by the following method:

[0078] Add 180 g of TPEG macromonomer and 200 g of water into the reactor equipped with a stirring device at normal temperature, turn on the stirring device, and stir until the TPEG macromonomer is completely dissolved. Add 2 g of potassium persulfate, 1 g of hydrogen peroxide (purity: 35%), and 2.5 g of maleic anhydride to the reaction system, and continue to full...

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Abstract

The invention relates to a polycarboxylate water reducer for ultra-compact concrete for nuclear power and a preparation method of the polycarboxylate water reducer. Every 100 parts of the water reducer comprises components in parts by weight as follows: 50-55 parts of a dispersing ether type polycarboxylate water reducer, 20-25 parts of a slump retaining ether type polycarboxylate water reducer, 3-5 parts of a retarder, 0.01-0.05 parts of a defoaming agent, 1-3 parts of a water retaining agent, 1-2 parts of a shrinkage reducing agent, 0.1-0.3 parts of a preservative and the balance of water. The components are uniformly mixed in parts by weight during preparation. Compared with the prior art, the water reducer has the advantages as follows: concrete workability and liquidity are improved, a temperature peak value and a shrinkage value of the concrete are reduced, the internal porosity of the concrete is reduced, the self-compacting performance and the durability of the concrete are improved and the like; besides, the preparation method is simple, raw material sources are wide, the cost is low, and the water reducer is environment-friendly and has the good application prospect.

Description

technical field [0001] The invention belongs to the technical field of water reducers, and relates to a water reducer and a preparation method thereof, in particular to an ultra-dense concrete polycarboxylate water reducer for nuclear power and a preparation method thereof. Background technique [0002] The base plate of the AP1000 nuclear island raft is a reinforced concrete raft base integrated with the base plate of the reactor and the base plate of the auxiliary powerhouse. 27.7m. Concreting of the entire floor will be done in one go. It is a typical variable cross-section mass concrete structure. The performance requirements of the admixture used are extremely high, for example: the concrete has good workability, the slump loss within one hour is within 40mm, and the air content loss is within 2%. [0003] Due to its unique molecular structure characteristics, polycarboxylate superplasticizer can produce steric repulsion in cement paste, and has stronger dispersibili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/32C08F283/06C08F220/06C08F222/06C08F220/14
Inventor 张雄何燕顾明东洪万领
Owner TONGJI UNIV
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