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Method for controlling metro stray current corrosion of reinforced concrete

A technology of reinforced concrete and stray current, which is applied in the field of subway infrastructure, can solve the problems that corrosion is not necessarily effective, and achieve the effect of reducing driving force and changing electromotive force

Inactive Publication Date: 2017-06-16
JINAN RAILWAY TRANSPORT GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, the released corrosion inhibitor ions can effectively inhibit the chemical corrosion of steel bars, but it is not necessarily effective for electrolytic corrosion, that is, corrosion under the action of electric current

Method used

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  • Method for controlling metro stray current corrosion of reinforced concrete
  • Method for controlling metro stray current corrosion of reinforced concrete

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A method for controlling the corrosion of reinforced concrete by subway stray currents, calcining layered double hydroxide (hydrotalcite) at 500°C for 6 hours, and then dissolving the calcined hydrotalcite in a 20% sodium hydroxide solution Soak in water for 12h, filter with water, and dry. The dried hydrotalcite is mixed into the concrete cementitious material at a mass ratio of 5%, mixed and stirred in a mixer, and shaped reinforced concrete is poured.

Embodiment 2

[0030] A method for controlling the corrosion of reinforced concrete by subway stray current, calcining the layered double hydroxide (hydrotalcite) in the range of 550°C for 7 hours, and then dissolving the calcined hydrotalcite in a 30% sodium hydroxide solution by mass ratio Soak in water for 18 hours, filter with water, and dry. The dried hydrotalcite is mixed into the concrete cementitious material according to the mass ratio of 8%, mixed and stirred in the mixer, and the shaped reinforced concrete is poured.

Embodiment 3

[0032] A method for controlling stray current corrosion of steel reinforced concrete in subways, calcining layered double hydroxide (hydrotalcite) in the range of 580°C for 7.5h, and then dissolving the calcined hydrotalcite in 35% sodium hydroxide Soak in the solution for 20h, filter with water, and dry. The dried hydrotalcite is 9% by mass, mixed into the concrete cementitious material, mixed and stirred in a mixer, and shaped reinforced concrete is poured.

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Abstract

The invention relates to a method for controlling metro stray current corrosion of reinforced concrete. The method includes: calcining layered double hydroxide (hydrotalcite), soaking the calcined hydrotalcite in a sodium hydroxide solution, conducting filtration with water and performing drying; mixing the dried hydrotalcite into a concrete cementing material, performing mixing in a stirrer, and conducting pouring molding to form concrete. The method provided by the invention changes the activity of ions in the solution so as to change the electromotive force of the electrode, and can reduce the driving force of electrolysis reaction and control the metro stray current corrosion of reinforced concrete.

Description

technical field [0001] The invention belongs to the technical field of subway infrastructure, and discloses a method for controlling stray currents in subways to corrode reinforced concrete. Background technique [0002] During the operation of the subway, stray currents are likely to be generated, causing electrochemical corrosion of the steel bars, seriously affecting the durability and service life of the reinforced concrete structure of the subway, and leaving a great safety hazard for the subway operation. At present, mineral admixtures are usually added to concrete at home and abroad, and the secondary pozzolanic effect and micro-aggregate filling effect are used to optimize the pore structure of dense concrete, reduce the ion concentration in the pore solution, enhance the impedance behavior of reinforced concrete, and reduce Through the electricity of the steel bar, the corrosion of the steel bar by the stray current is reduced. Although mineral admixtures increase ...

Claims

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Application Information

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IPC IPC(8): C04B22/06
CPCC04B22/062C04B2103/60
Inventor 刘玲王国富路林海
Owner JINAN RAILWAY TRANSPORT GRP CO LTD
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