Performance of Zinc Anodes for Cathodic Protection of Reinforced Concrete Bridges

Covino, Bernard S.; Cramer, Stephen D.; Bullard, Sophie J.; Holcomb, Gordon R.; Russell, James H.; Collins, W. Keith; Laylor, M.; Cryer, C.B.

doi:10.2172/804079

Cited by 16 publications

(32 citation statements)

References 20 publications

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“…In both GCP and ICCP systems, physical changes occur at the Zn-concrete interface with time (Covino, et al 1996a;Covino, et al 1996b;Covino, et al 2002;Holcomb, et al 1996). Zinc oxide (ZnO) reaction products accumulate at the interface between the TS Zn anode and the concrete, as the anode is consumed.…”

Section: Cathodic Protection Processesmentioning

confidence: 99%

“…The presence of water at the Zn-concrete interface improves the performance of the CP system and increases its service life Bullard, et al 1998;Covino, et al 2002).…”

Section: Cathodic Protection Processesmentioning

confidence: 99%

“…Related to this project, several publications have been written on laboratory and field study research in progress Bullard, et al 2000;Bullard, et al 2001;Covino, et al 1999a;Covino, et al 1999b;Covino, et al 1999c;Holcomb, et al 2000a;Holcomb, et al 2000b). …”

Section: Humectantsmentioning

confidence: 99%

“…Figure 3.2 shows this as the "Br 2 nose" that extends up to a pH of 8. The pH of zinc anode-concrete interfaces from bridge ICCP systems were measured after electrochemical aging of about 3 years, and were found to be between 7 and 8 Covino, et al 2002). In the absence of a humectant it was surmised that Equation 3-2 was occurring, which lowered the interfacial pH.…”

Section: Bromide Oxidationmentioning

confidence: 99%

“…Zinc-coated concrete slabs from earlier studies (Covino, et al 1996a;Covino, et al 1996b;Covino, et al 2002;Holcomb, et al 1996), representing a broad range of electrochemical ages, were used to study humectant effects on aged anodes. They had 5.0 lb/yd 3 (3.0 kg/m 3 ) of NaCl.…”

Section: Aged Sample Preparationmentioning

confidence: 99%

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Humectants To Augment Current From Metallized Zinc Cathodic Protection Systems on Concrete

Holcomb¹,

Covino²,

Cramer³

et al. 2002

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Sponsoring Agency Code Supplementary Notes AbstractCathodic protection (CP) systems using thermal-sprayed zinc anodes are employed to mitigate the corrosion process in reinforced concrete structures. However, the performance of the anodes is improved by moisture at the anode-concrete interface. Research was conducted to investigate the effect of hydrophilic chemical additives, humectants, on the electrical performance and service life of zinc anodes. Lithium bromide and lithium nitrate were identified as feasible humectants with lithium bromide performing better under galvanic CP and lithium nitrate performing better under impressed current CP. Both humectants improved the electrical operating characteristics of the anode and increased the service life by up to three years.17.

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Section: Cathodic Protection Processesmentioning

confidence: 99%

“…The presence of water at the Zn-concrete interface improves the performance of the CP system and increases its service life Bullard, et al 1998;Covino, et al 2002).…”

Section: Cathodic Protection Processesmentioning

confidence: 99%