Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Intermittent Application of Cathodic Protection, Interim Report
Oregon's coastal highway includes over 120 bridges, most of which are reinforced concrete (RC) bridges. Over 40,000 sq. meters (430,566 sq. feet) of bridge surface has been repaired and protected from further corrosion damage using thermal-sprayed (TS) zinc anodes in impressed current and sacrificial cathodic protection (CP) systems. In addition, thermal-sprayed titanium, conductive carbon paint, and zinc-hydrogel anodes are being evaluated in demonstration projects on coastal RC bridges. Field and laboratory studies were conducted to evaluate commercial corrosion rate monitoring devices (CRMDs) suitable for use in intermittent CP (ICP) field operation on Oregon's coastal RC bridges. These studies showed that there was good agreement between mass loss and linear polarization resistance (LPR) measurement of rebar corrosion rates when the Stearn-Geary constant B was estimated using harmonic distortion analysis (HDA). There was good agreement between laboratory LPR corrosion rate measurements for rebar in concrete and measurements made using three commercial CRMDs (Gamry RPX1 LPR, SmartCET LPR, and SmartCET HDA). Since ICP operation uses depolarization and protection current measurements to monitor the CP system performance, it is necessary to install the CP system with conductive coating anodes isolated from the rebar.
Intermittent Application of Cathodic Protection, Interim Report
Oregon's coastal highway includes over 120 bridges, most of which are reinforced concrete (RC) bridges. Over 40,000 sq. meters (430,566 sq. feet) of bridge surface has been repaired and protected from further corrosion damage using thermal-sprayed (TS) zinc anodes in impressed current and sacrificial cathodic protection (CP) systems. In addition, thermal-sprayed titanium, conductive carbon paint, and zinc-hydrogel anodes are being evaluated in demonstration projects on coastal RC bridges. Field and laboratory studies were conducted to evaluate commercial corrosion rate monitoring devices (CRMDs) suitable for use in intermittent CP (ICP) field operation on Oregon's coastal RC bridges. These studies showed that there was good agreement between mass loss and linear polarization resistance (LPR) measurement of rebar corrosion rates when the Stearn-Geary constant B was estimated using harmonic distortion analysis (HDA). There was good agreement between laboratory LPR corrosion rate measurements for rebar in concrete and measurements made using three commercial CRMDs (Gamry RPX1 LPR, SmartCET LPR, and SmartCET HDA). Since ICP operation uses depolarization and protection current measurements to monitor the CP system performance, it is necessary to install the CP system with conductive coating anodes isolated from the rebar.
Intermittent Application of Cathodic Protection, Interim Report
S. D. Cramer (Autor:in) / S. J. Bullard (Autor:in) / B. S. Covino (Autor:in) / M. Ziomek-Moroz (Autor:in) / G. R. Holcomb (Autor:in)
2005
78 pages
Report
Keine Angabe
Englisch
Construction Equipment, Materials, & Supplies , Corrosion & Corrosion Inhibition , Coatings, Colorants, & Finishes , Bridges(Structures) , Cathodic protection , Oregon , Galvanic , Intermittent , Constant voltage , Thermal spray , Zinc , Chloride , Zinc hydrogel , Corrosion rate monitoring devices (CRMDs) , Reinforced concrete bridges
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