Abstract
This paper presents the performance of various cathodic-protection designs using Aluminum alloys to protect prestressed piles. The results obtained with different system designs (bracelete type-Al/Zn/In alloy, thermosprayed aluminum (3-year evaluation) and conventional Al/Zn/In anocies in an epoxy-painted steel bracelet (12-year evaluation)), indicated that all of these systems may be used as sacrificial anodes for pile protection. However, the thermosprayed aluminum type can not be used in prestressed concrete piles because the very negative potentials ( 4 ) they supply to the reinforcement could lead to hydrogen embrittlement.
Highlights
The past few years have seen an increase in research on the use of sacrificial anodes for the cathodic protection of t h e reinforcement in reinforced concrete structures
A new system, known as "ZincHydrogel", was recently designed in an effort to control this situation. This system, which consists of a sheet of zinc foil backed by an ion-conducting adhesive, appears to be producing better results^^ ^l. This system has been under study at Centro de Estudios de Corrosión (CEC), Universidad del Zulia, since 1984^^^'^^, following a promising line for t h e use of an Al/Zn/In alloy in specific situations, especially for prestressed piles in tide and splash areas^ \ Studies have lately been centered on the search for a safe and easy way to install these anodes embedded in highstrength porous mortar^^^l designed to allow corrosion-product diffusion from this aluminum n Centro de Estudios de Corrosión, Facultad de Ingeniería - Universidad del Zulia Maracaibo - Venezuela.Tel/Fax: 58-61598784/525732
Reinforcement potentials were measured before connecting the cathodic protection system, using a multimeter and the graphite electrode embedded in the concrete, as well as the purpose-built Cu/CuS04 electrode inserted in the orifices
Summary
The past few years have seen an increase in research on the use of sacrificial anodes for the cathodic protection of t h e reinforcement in reinforced concrete structures. A new system, known as "ZincHydrogel", was recently designed in an effort to control this situation This system, which consists of a sheet of zinc foil backed by an ion-conducting adhesive, appears to be producing better results^^ ^l. This system has been under study at Centro de Estudios de Corrosión (CEC), Universidad del Zulia, since 1984^^^'^^, following a promising line for t h e use of an Al/Zn/In alloy in specific situations, especially for prestressed piles in tide and splash areas^ \ Studies have lately been centered on the search for a safe and easy way to install these anodes embedded in highstrength porous mortar^^^l designed to allow corrosion-product diffusion from this aluminum n Centro de Estudios de Corrosión, Facultad de Ingeniería - Universidad del Zulia Maracaibo - Venezuela.Tel/Fax: 58-61598784/525732. This work presents the latest results obtained with three different anode locations: Bracelet-type Al/Zn/In, thermosprayed Al. (3-year evaluation) and conventional Al/Zn/In anodes in an epoxycoated steel bracelet (IZ-year evaluation)
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