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A multifunctional admixture for improving concrete strength, efficiently inhibiting chloride ion diffusion and steel bar corrosion and preparation method thereof

A technology for chloride ion diffusion and concrete strength, applied in chemical instruments and methods, nanotechnology for materials and surface science, silicon compounds, etc. Solve problems such as singleness, achieve the effect of improving the low utilization rate of functions, inhibiting the corrosion of steel bars, and improving the level of integration

Active Publication Date: 2021-10-08
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional anti-corrosion materials for steel bars not only have a single function, but also cannot solidify chloride ions, and have no obvious inhibitory effect on the diffusion of chloride ions. long-term
At the same time, the existing rust inhibitors have no obvious effect on improving the strength of concrete

Method used

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  • A multifunctional admixture for improving concrete strength, efficiently inhibiting chloride ion diffusion and steel bar corrosion and preparation method thereof
  • A multifunctional admixture for improving concrete strength, efficiently inhibiting chloride ion diffusion and steel bar corrosion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Dissolve 7.3g of octane and 0.146g of L-lysine in 280ml of distilled water and stir at 60°C for 1h; then add 4g of tetraethyl orthosilicate and stir at 60°C for 4h to obtain nano Silica solution. 6.83g of NaNO 2 Dissolve in 200ml distilled water to form B liquid, 34.18gMg(NO 3 ) 2 ·6H 2 O, 25g Al(NO 3 ) 3 9H 2 O (Mg / Al molar ratio equal to 2) was dissolved in 200ml of distilled water to form A liquid. Add solution A to solution B dropwise, use 2 mol / l NaOH to maintain the pH at around 10, and stir at 25°C for 1 hour. Then keep the temperature at 60°C for 15 hours in a water bath, wash with distilled water three times, and dry in vacuum for 15 hours to obtain layered Mg-Al double hydroxides (LDHs) synthesized by co-deposition method. Grind 1.12 g of the prepared layered Mg-Al double metal hydroxide into powder, dissolve it in 280 ml of distilled water and ultrasonicate for 20 minutes, then add it dropwise to the synthesized nano-silica solution, and maintain it w...

Embodiment 2

[0037] Dissolve 7.3g of octane and 0.146g of L-lysine in 280ml of distilled water and stir at 60°C for 3h; then add 4g of tetraethyl orthosilicate and stir at 60°C for 6h to obtain nano Silica solution. 6.83g of NaNO 2 Dissolved in 200ml distilled water to form B solution, 34.18g Mg(NO 3 ) 2 ·6H 2 O, 16.69gAl(NO 3 ) 3 9H 2 O (Mg / Al molar ratio equal to 3) was dissolved in 200ml of distilled water to form A solution. Add solution A to solution B dropwise, use 2mol / l NaOH to maintain the pH value at about 10, and stir at 25°C for 3h. Then keep the temperature at 80° C. for 20 h in a water bath, wash with distilled water for 5 times, and dry in vacuum for 24 h to obtain layered Mg-Al double hydroxides (LDHs) synthesized by co-deposition method. Grind 1.12 g of the prepared layered Mg-Al double metal hydroxide into powder, dissolve it in 280 ml of distilled water and ultrasonicate for 50 min, then add it dropwise to the synthesized nano-silica solution, and maintain it wit...

Embodiment 3

[0040] Dissolve 7.3g of octane and 0.146g of L-lysine in 280ml of distilled water and stir at 60°C for 2h; then add 4g of tetraethyl orthosilicate and stir at 60°C for 5h to obtain nano Silica solution. 6.83g of NaNO 2 Dissolved in 200ml distilled water to form B solution, 34.18g of Mg(NO 3 ) 2 ·6H 2 O, 20.03g Al(NO 3 ) 3 9H 2 O (Mg / Al molar ratio equal to 2.5) was dissolved in 200ml of distilled water to form A solution. Add solution A to solution B dropwise, use 2 mol / l NaOH to maintain the pH at about 10, and stir at 25°C for 2 hours. Then keep the temperature in a water bath at 70°C for 16 hours, wash with distilled water for 4 times, and dry in vacuum for 20 hours to obtain layered Mg-Al double hydroxides (LDHs) synthesized by co-deposition method. Grind 1.12 g of the prepared layered Mg-Al double metal hydroxide into powder, dissolve it in 280 ml of distilled water and ultrasonicate for 40 minutes, then add it dropwise to the synthesized nano-silica solution, and...

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Abstract

The invention discloses a multifunctional admixture for improving concrete strength, efficiently inhibiting chloride ion diffusion and steel bar corrosion and a preparation method thereof. SiO 2 @LDHs) composition; nano-silica (nano‑SiO2) synthesized by microemulsion method 2 ) solution, the layered Mg-Al hydroxide (LDHs) powder of nitrite intercalation synthesized by co-deposition method; the prepared LDHs solution is added to the nano-silica solution, and the resulting suspension is centrifuged, washed, and dried, that is have to. The concrete admixture provided by the invention can be widely used in marine concrete projects such as ports, sea-crossing bridges, and flood control dams, and can simultaneously improve concrete strength, efficiently inhibit chloride ion diffusion and steel bar corrosion, and the admixture has a simple preparation process and is easy to industrialize And promotion, the application prospect is very broad.

Description

technical field [0001] The invention relates to a concrete admixture and a preparation method thereof, in particular to a multifunctional admixture which improves concrete strength, efficiently inhibits chloride ion diffusion and steel bar corrosion, and a preparation method. Background technique [0002] Reinforced concrete structure combines many advantages of steel bar and concrete, and the cost is low. It is the preferred form in the design of civil engineering structures and is widely used. However, the reinforced concrete structure in the chloride salt environment is extremely susceptible to the corrosion of steel reinforcement chloride ions, which leads to premature failure of the engineering structure and shortens the service life. Adding anti-corrosion materials to steel bars is a protection method that is widely used in practice because of its advantages of simplicity, high efficiency and relatively low cost. However, the traditional anti-corrosion materials for s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/06C01F7/00C01B33/18B82Y30/00
CPCB82Y30/00C01B33/18C01B33/186C01F7/00C01P2002/72C01P2004/03C04B22/06C04B40/0039
Inventor 徐金霞吴悠王序晖
Owner HOHAI UNIV
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