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A method for inhibiting the decomposition of sodium gluconate in naphthalene-based superplasticizers for large and medium-sized hydropower projects

A high-efficiency water-reducing agent, a large and medium-sized hydropower technology, applied in the field of concrete admixtures, which can solve the impact of Kasong on the mechanical properties and long-term durability of concrete. There is no systematic study, increasing the production cost of water-reducing agent, and the adverse effects of steel corrosion. and other problems, to achieve the effect of low raw material prices, increased concrete costs, and green, healthy and environmentally friendly concepts

Active Publication Date: 2022-04-08
CHINA THREE GORGES PROJECTS DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But its application in concrete will cause the following problems: (1) Casson (3C 4 h 4 ClNOS+C 4 h 5 The content of chlorine element in NOS) is relatively high (mass fraction 19%), and the chloride ions produced by degradation after adding to concrete will have an adverse effect on the corrosion of steel bars in reinforced concrete
(2) Hazardous substances contained in Kason (such as heavy metal lead ions, about 30ppm) will damage human health and pollute the natural environment
(3) Kathon is mainly used in the field of daily chemical industry. At present, there is no systematic research on the influence of Kathon on the mechanical properties and long-term durability of concrete, and there is a lack of theoretical basis for its application in concrete.
(4) The addition of Kathon as a preservative component will increase the production cost of the water reducer

Method used

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  • A method for inhibiting the decomposition of sodium gluconate in naphthalene-based superplasticizers for large and medium-sized hydropower projects
  • A method for inhibiting the decomposition of sodium gluconate in naphthalene-based superplasticizers for large and medium-sized hydropower projects
  • A method for inhibiting the decomposition of sodium gluconate in naphthalene-based superplasticizers for large and medium-sized hydropower projects

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Experimental program
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Effect test

Embodiment 1

[0041] A method for inhibiting the decomposition of sodium gluconate in a naphthalene-based high-efficiency water-reducer for large and medium-sized hydropower projects. The method is to use a naphthalene-based high-efficiency water-reducer solution to control the pH of the naphthalene-based high-efficiency water-reducer solution to 8.0 to 12.0 The preparation method of the naphthalene series high-efficiency water reducer solution comprises the following steps:

[0042] Step 1: Use concrete mixing water to clean the water reducing agent preparation pool of the mixing system, and keep the preparation pool in a clean and anhydrous state.

[0043] Step 2: Put 5 parts of industrial grade NaOH into the water reducer preparation tank, gradually pour in about 1 / 2 of the tank volume with concrete mixing water to dissolve, and start the stirring device in the preparation tank at a speed of 300 rpm Stirring was continued for 0.75 h, so that the solution mass concentration was about 0.13...

Embodiment 2

[0048] A method for inhibiting the decomposition of sodium gluconate in a naphthalene-based high-efficiency water-reducer for large and medium-sized hydropower projects. The method is to use a naphthalene-based high-efficiency water-reducer solution to control the pH of the naphthalene-based high-efficiency water-reducer solution to 8.0 to 12.0 The preparation method of the naphthalene series high-efficiency water reducer solution comprises the following steps:

[0049] Step 1: Use concrete mixing water to clean the water reducing agent preparation pool of the mixing system, and keep the preparation pool in a clean and anhydrous state.

[0050] Step 2: Take 5 parts of industrial grade NaOH and 1 part of industrial grade Na(CO 3 ) 2 Put it into the water reducer preparation pool, gradually pour in about 1 / 4 of the pool volume with concrete mixing water to dissolve, and start the stirring device in the preparation pool at the same time, and continue stirring at a speed of 200 r...

Embodiment 3

[0069] A naphthalene-based superplasticizer solution for large and medium-sized hydropower projects that can inhibit the decomposition of sodium gluconate. The pH of the naphthalene-based superplasticizer solution is controlled to be 8.0 to 12.0; , B, C three components, each component is as follows:

[0070] A component is NaOH, Na(CO 3 ) 2 , B component is naphthalene series superplasticizer powder, C is concrete mixing water. The preparation method of the naphthalene series high-efficiency water reducer solution comprises the following steps:

[0071] Step 1: Use concrete mixing water to clean the water reducing agent preparation pool of the mixing system, and keep the preparation pool in a clean and anhydrous state.

[0072] Step 2: Take 3 parts of industrial grade NaOH and 1 part of industrial grade Na(CO 3 ) 2 Put it into the water reducer preparation pool, gradually pour in about 1 / 4 of the pool volume with concrete mixing water to dissolve, and start the stirring ...

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Abstract

The invention relates to a method for inhibiting the decomposition of sodium gluconate in a naphthalene-based high-efficiency water-reducer for large and medium-sized hydropower projects. The naphthalene-based high-efficiency water-reducer solution includes three components: A, B, and C, each of which is as follows: Component A is inorganic base or strong base and weak acid salt or a combination thereof, component B is naphthalene-based high-efficiency water reducer powder, C is water for concrete mixing, and the pH value of the naphthalene-based high-efficiency water-reducer solution is 8.0-12.0. The invention has the advantages of simple preparation process, low raw material price, simple addition method, almost no increase in the production cost of the water reducing agent and the operation cost of the mixing system, good economy, strong practicability and high operability. The added inorganic base and strong base and weak acid salt compound are non-toxic and harmless, and the single dosage is relatively low. While prolonging the setting time of concrete and improving the workability of the mixture, it will not affect the corrosion of concrete reinforcement, frost resistance, impermeability, etc. Durability has harmful effects, and it has broad application prospects in large and medium-sized hydropower projects.

Description

technical field [0001] The invention relates to the field of concrete admixtures, in particular to a method for inhibiting the decomposition of sodium gluconate in naphthalene-based high-efficiency water reducers used in large and medium-sized hydropower projects. Background technique [0002] Naphthalene-based water reducer is a chemically synthesized non-air-entraining high-efficiency water reducer. Its chemical name is naphthalenesulfonate formaldehyde condensate. Its consumption accounts for about 70% of the total consumption of water reducers in my country, and it is the largest production volume at present. , The most widely used water reducing agent varieties. Naphthalene-based high-efficiency water-reducing agent has the characteristics of high water-reducing rate (15-20%), relatively good adaptability to cement, can be used in combination with other admixtures, and relatively low price. It can be used to prepare normal, fluid, Cast-in-place concrete and prefabricate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/22C04B103/30
CPCC04B40/0039C04B2103/302C04B24/226C04B22/002C04B22/062C04B22/10
Inventor 刘战鳌孙明伦王玮胡洪涛黄仁阔刘春风窦立刚
Owner CHINA THREE GORGES PROJECTS DEV CO LTD
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