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Corrosion prevention method for a concrete bridge

A concrete and bridge technology, applied in bridges, bridge maintenance, bridge reinforcement, etc., can solve problems such as changing concrete performance, affecting bridge life, complex construction process, etc., to prolong construction time, prevent corrosion, and install and construct the effect of simple construction process.

Inactive Publication Date: 2011-08-31
DALIAN MUNICIPAL DESIGN & RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In China, the processing cost of epoxy steel coating is high, and the construction technology requirements are high.
[0007] The first two methods above will change the performance of concrete and affect the life of the bridge, while the latter method has complicated construction techniques and is not easy to popularize

Method used

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  • Corrosion prevention method for a concrete bridge
  • Corrosion prevention method for a concrete bridge
  • Corrosion prevention method for a concrete bridge

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings. Such as figure 1 Shown, a kind of anticorrosion method of concrete bridge comprises the following steps:

[0027] A, a permanent auxiliary anode 3 is placed inside the steel bar 2 concrete 1, and a DC power supply is connected between the auxiliary anode 3 and the steel bar 2 as the cathode;

[0028] B. Connect the negative pole of the DC power supply to the steel bar 2, and the positive pole to the auxiliary anode 3;

[0029] C. Turn on the power supply so that the magnitude of the inflowing direct current is sufficient to force the anode reaction on the surface of the steel bar 2 to stop completely.

[0030] The auxiliary anode 3 of the present invention adopts an active titanium mesh belt, and its parameters are as follows: the width is 6.3 mm; the thickness is 0.6 mm; the substrate is titanium-based grade 1 ASTMB265; the anode coating is a noble metal oxide cataly...

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Abstract

The invention discloses a corrosion prevention method for a concrete bridge. The corrosion prevention method includes the following steps: placing a permanent auxiliary anode in reinforced concrete; connecting a direct-current power supply between the auxiliary anode and a steel bar as a cathode; connecting the negative pole of the direct-current power supply with the steel bar and the positive pole with the auxiliary anode; and conducting the power supply for enabling the influent direct current to be big enough for forcing the anode reaction on the surface of the steel bar to be stopped fully. The cathode reaction of the steel bar in concrete can generate hydroxide radical ions which increase the alkalinity of the concrete, thus being beneficial to rebuilding passivation layer for the steel bar which is carbonated by the concrete or corroded by chloride. In the concrete provided with an external current cathode protection system, electronegative chloride ions are repelled by the steel bar as the cathode, move toward the auxiliary anode, lose electrons on the surface of the auxiliary anode and then are oxidized to form chlorine which thus playing a corrosion-prevention role.

Description

technical field [0001] The invention relates to a bridge anticorrosion technology, in particular to a concrete bridge anticorrosion method. Background technique [0002] Due to the huge investment and long construction period of cross-sea bridge projects and the influence of the marine environment, the anticorrosion of concrete in the severely corroded splash zone and water level fluctuation zone has become one of the key technologies to ensure the normal use of the structure. [0003] The corrosion of concrete structure steel bars in bridge engineering under marine environment is caused by chloride corrosion. At present, the anti-corrosion technologies used in bridge engineering in marine environment mainly include adding anti-corrosion agent to concrete, coating protection on concrete surface and using epoxy coating. rebar. [0004] Rust inhibitors are liquid or powdered chemicals that are added to concrete mixtures as admixtures to prevent the corrosion of steel bars by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D21/00E01D22/00
Inventor 许艳林
Owner DALIAN MUNICIPAL DESIGN & RES INST
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