Cathodic polarization and protection of simulated prestressed concrete pilings in seawater

Journal Article · Tue Mar 01 04:00:00 EST 1994 · Corrosion (Houston); (United States)

DOI:https://doi.org/10.5006/1.3293510· OSTI ID:5111704

Pangrazzi, R ^[1]; Hartt, W H ^[2]; Kessler, R ^[3]

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1. Florida Atlantic Univ., Hawthorne, NY (United States)
2. Florida Atlantic Univ., Boca Raton, FL (United States). Center for Marine Materials
3. Bureau of Materials and Research, Gainesville, FL (United States). Florida Dept. of Transportation

Experiments were conducted to determine the effectiveness of localized cathodic polarization for reducing corrosion of simulated prestressed concrete piles containing continuous and segmented tendons exposed to seawater. Conductive rubber was used as the anode material. Corrosion of the steel was enhanced for most specimens by admixing calcium chloride (CaCl[sub 2]) during concrete pouring. Specimens were polarized cathodically at constant potentials (current on) ranging from [minus]0.72 V[sub SCE] to [minus]1.10 V[sub SCE]. The magnitude of impressed current and its distribution along the embedded steel were monitored as a function of exposure time and level of polarization. Potential distributions for the continuous and segmented tendons were measured also. The level of cathodic polarization was assessed as a function of position along the specimens by the depolarization method and by post-test visual inspection. Protection was achieved where instant-off potentials were more negative than [minus]0.75 V[sub SCE]. Polarization was negligible at heights > [approximately]1 dm above the anode. Results were presented within the context of protecting marine pilings from corrosion.

• OSTI ID: 5111704
• Journal Information: Corrosion (Houston); (United States), Journal Name: Corrosion (Houston); (United States) Vol. 50:3; ISSN 0010-9312; ISSN CORRAK
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360604* -- Materials-- Corrosion
Erosion
& Degradation
42 ENGINEERING
423000 -- Engineering-- Marine Engineering-- (1980-)
ALLOYS
BUILDING MATERIALS
CATHODIC PROTECTION
CHLORIDES
CHLORINE COMPOUNDS
COASTAL WATERS
COMPOSITE MATERIALS
CONCRETES
CORROSION PROTECTION
CORROSIVE EFFECTS
FOUNDATIONS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MECHANICAL STRUCTURES
OXYGEN COMPOUNDS
PRESTRESSED CONCRETE
REINFORCED CONCRETE
REINFORCED MATERIALS
SEAWATER
STEELS
SUPPORTS
SURFACE WATERS
WATER