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Corrosion Repair and Corrosion Protection

of Reinforced Concrete Structures in

Pulp and Paper Mills

Vector Construction / Vector Corrosion Technologies

www.vectorgroup.com

www.vector-corrosion.com

Presentation Outline

• Introduction

• Corrosion of Reinforced Concrete Structures

• Protection of Chests and Clarifiers

• Galvanic Protection of Columns, Beams, Floors etc.

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Fe Fe2+ + 2e -

Fe2+ + 2Cl- FeCl2

2Fe(OH)2 + 1/2O2 Fe2O3 + 2H2O

1/2O2 + H2O + 2e - 2OH-

FeCl2 + 2OH- Fe(OH)2 + 2Cl-

2OH-

Fe3O4

γFe2O3

Fe3O4

γFe2O3

Anode

2e -

Cathode

Corrosion Cell in Concrete

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Containment Problem – Cracked Lining

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Epoxy Injection

Base Grouting

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Corrosion Cell in Concrete

Fe Fe2+ + 2e -

Fe2+ + 2Cl- FeCl2

2Fe(OH)2 + 1/2O2 Fe2O3 + 2H2O

1/2O2 + H2O + 2e - 2OH-

FeCl2 + 2OH- Fe(OH)2 + 2Cl-

2OH-

Fe3O4

γFe2O3

Fe3O4

γFe2O3

Anode

2e -

Cathode

-350 mV

-200 mV

-500 mV

Patch Accelerated Corrosion

Cathode

Chloride-Free Patch Chloride Contaminated Concrete

Fe Fe2+ + 2e -

Fe2+ + 2Cl- FeCl2

2Fe(OH)2 + 1/2O2 Fe2O3 + 2H2O

FeCl2 + 2OH- Fe(OH)2 + 2Cl-

1/2O2 + H2O + 2e - 2OH-

2OH-

2e - Anode

-350 mV -200 mV

-200 mV

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Installed Galvanic Anode

Anode Galvanically Protects

Surrounding Rebar

Chloride-Free Patch Chloride Contaminated Concrete

-1100 mV

-350 mV -200 mV

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Galvanic Protection of Sound Concrete

Corrosion problem!

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front front

back

back

2” Ø x 5.5” deep hole

= 1.75” Ø x 4” Galvanic Anode @ 12” oc.

1.5” Ø x 6.5” deep hole with

1.25” Ø x 5.25” Galvanic

anode @ 12” oc.

Galvanic Anode Installation Details

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SKOGHALL

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SKOGHALL

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SKOGHALL

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Thank You

?