Corrosion Repair and Corrosion Protection of Reinforced ......Corrosion Repair and Corrosion...
Transcript of Corrosion Repair and Corrosion Protection of Reinforced ......Corrosion Repair and Corrosion...
11/14/2014
1
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.
11/14/2014
2
11/14/2014
3
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
11/14/2014
4
11/14/2014
5
11/14/2014
6
11/14/2014
7
Containment Problem – Cracked Lining
11/14/2014
8
11/14/2014
9
Epoxy Injection
Base Grouting
11/14/2014
10
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
11/14/2014
11
Installed Galvanic Anode
Anode Galvanically Protects
Surrounding Rebar
Chloride-Free Patch Chloride Contaminated Concrete
-1100 mV
-350 mV -200 mV
11/14/2014
12
11/14/2014
13
Galvanic Protection of Sound Concrete
Corrosion problem!
11/14/2014
14
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
11/14/2014
15
SKOGHALL
11/14/2014
16
SKOGHALL
11/14/2014
17
11/14/2014
18
SKOGHALL
11/14/2014
19
11/14/2014
20
11/14/2014
21
Thank You
?