Durability Enhancement for New and Deteriorating Infrastructure

Zinc Layer Discrete Anode 


A self-contained, durability enhancement system, for atmospherically exposed reinforced concrete.


Provides active electrochemical corrosion control by providing:

  • cathodic protection, capable of stopping, reinforcement corrosion, in old chloride contaminated and carbonated structures.

  • cathodic prevention, capable of slowing down or preventing the initiation of reinforcement corrosion, for newly constructed structures.


Zinc Layer Discrete Anode (ZLDA) consists of a high purity zinc foil, complete with an ion-conductive, auto moistening, humectant/activator layer and centralised perforated galvanised steel strip, which is electrically connected to the zinc foil.


When connected to the reinforcement and encapsulated in the concrete, the zinc foil corrodes at the humectant/activator layer and provides galvanic cathodic protection to the surrounding embedded reinforcement.

Where installed with monitoring facilities, ZLDA can be monitored and evaluated against the cathodic protection criteria listed within BS EN ISO 12696.


For existing structures, the anodes are positioned below the existing reinforcement, following damaged concrete removal, the anodes are fixed directly to the exposed reinforcement, using the galvanised steel strip and are encased in the concrete repair material as part of the concrete repair process.


For new structures, the anodes are fixed directly to the exposed reinforcement using the galvanised steel strip and are then encased in the structural concrete as part of the construction process.


ZLDA do not contain any chlorides or chemicals which are harmful to the structure, personnel or the environment.



ZLDA is suitable for protecting atmospherically exposed reinforced concrete structures suffering from chloride or carbonation induced reinforcement corrosion and resulting concrete deterioration.


Used in conjunction with concrete repairs, it provides structure life extension and deterioration control of existing damaged structures. Used locally to provide patch repair enhancement and prevent incipient anode formation for concrete patch repairs, in chloride contaminated concrete, or when incorporating old chloride contaminated structures into a new build.


For severely deteriorated structures requiring extensive concrete repairs, it can be used globally across the structure to provide structure life extension and durability control.


For new structures, it can be used to provide durability enhancement or deterioration prevention, when installed in the early life of a structure, to prevent the onset of corrosion related deterioration, at high risk areas, like construction joints, construction defect areas or areas of low cover.