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Solvent-based acrylic carbon paint anodes were installed on the north approach spans of the Yaquina Bay Bridge (Newport OR) in 1985 and performed well after 15 years. Anodes were inexpensive and repairs easy. Depolarization potentials are consistently above 100 with long-term current densities around 2 mA/m 2. Bond strength remains adequate.
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This paper presents examples of anode array arrangements and corresponding attenuation characteristic calculations to enable optimization of current distribution. It also presents examples of return current imbalances and how they may be corrected.
The phenomenon of a potential-dependent chloride threshold (PDT) along with the corrosion macrocell coupling between active and passive steel assembly components allows to combine a corrosion initiation-propagation model to forecast the durability of reinforced concrete structures in marine service.
The Houston Ship Channel is a modern engineering feat. Brackish water. Chloride induced corrosion. Subsidence. Change in water levels and exposure conditions. These issues are explored in this paper reviewing methodologies and results of service life modeling from a recent multi-structure assessment by the authors.
For reinforced concrete (RC) structures that are in drier locations but still need of cathodic protection (CP), impressed current cathodic protection (ICCP) systems are preferred. In this study, the performance of activated zinc anodes installed on dry or high resistance concrete on Florida Bridges was evaluated.
A case history is presented to illustrate how assessment data was collected, interpreted, and used to develop and implement repair strategies for two 400 foot (121 m) tall hyperbolic shell cooling towers exhibiting widespread corrosion-induced deterioration.
This paper presents a case study (an abutment wall built in 1961)for updating the corrosion probability with half-cell potential measurement data.
The effect of high performance concrete on the corrosion behavior of steel bar in reinforced concrete (RC) specimens are experimentally investigated. Concrete specimens with the addition of fly ash, silica fume, and calcium nitrite were fabricated and tested for over 23 years.
This research was to determine if an iron carbonate (FeCO3) layer can be effective for prevention of CO2 corrosion of steel rebars, associated with production and use of carbonated calcium silicate cement-based concrete.
This work aims at comparing a performance of the UNS(1) S32304 lean-duplex stainless steel rebars in electrical contact with carbon steel rebars, both embedded in concrete subjected to a chloride ion contamination.
Historically, NACE SP0290, NACE SP0216, and NACE SP0408 included sets of criteria that needed to be satisfied to indicate that a cathodic protection (CP) system is delivering adequate current to passivate the reinforcing steel or reduce its corrosion current to low and non-destructive levels. These criteria were mostly the same, so the aim of this standard is to set out the essential criteria that each one of the above standards must satisfy in a single document. This allows each of the above standards, which deal with different applications of cathodic protection, to concentrate and expand on aspects that are specific for each application. This standard further suggests techniques that can be employed to estimate the level of protection achieved by a non-compliant cathodic protection method.
RARELY SEEN RESEARCH: Bridges: A Look Back—Historic Studies in Cathodic Protection: The 1990s, is a companion book to Bridges: A Look Back—Case Studies in Cathodic Protection: Substructures and Bridges: A Look Back—Case Studies in Cathodic Protection: Superstructures, both of which consist of nearly 30 years of curated legacy NACE technical papers and journal articles that cover exactly what the titles suggest.
This book consists of edited case histories, while the two original titles are compiled of the original, unabridged technical papers and journal articles.
2023 AMPP, 6 x 9 trim size, 52 pages, color