Influence of cathodic polarization upon bond strength of pretensioned tendons in concrete
- Florida Atlantic Univ., Boca Raton, FL (United States)
The possibility of bond loss for pretensioned tendon in concrete in response to cathodic protection has the potential for limiting applicability of this corrosion control methodology to this material class. To investigate the possible occurrence and significance of such bond loss, a series of pretensioned concrete beams were cathodically polarized utilizing current densities in the range 50--5,000 mA/m{sup 2} (tendon steel surface area basis), during which time specimen dimensional changes were monitored using strain gages which were both mounted upon the tendon and embedded in the concrete. Experimental difficulties were encountered in that the strain gages were not adequately durable; and the results were variable in that the strain data for some specimens at a given current density indicated partial bond loss whereas there was no indication of this for others. In the case of specimens that may have experienced partial bond loss, the results showed that this transpired at a lower total charge transfer the higher the applied cathodic current density and that, if current density upon an actual pretensioned concrete structure is uniform and in the range typical for cathodic protection, bond loss should not occur within the remaining service life of most structures.
- OSTI ID:
- 382561
- Report Number(s):
- CONF-960389-; TRN: IM9645%%112
- Resource Relation:
- Conference: National Association of Corrosion Engineers (NACE) annual corrosion conference and exposition: water and waste water industries, Denver, CO (United States), 24-29 Mar 1996; Other Information: PBD: 1996; Related Information: Is Part Of Corrosion/96 conference papers; PB: [6615] p.
- Country of Publication:
- United States
- Language:
- English
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