Durability Enhancement for New and Deteriorating Infrastructure

Zinc Layer Roll Anode (ZLRA)

ZLRA (002).jpg

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 Roll Anode (ZLRA) consists of a high purity zinc foil, complete with an ion-conductive, auto moistening, humectant/activator layer. The zinc foil is rolled into a cylinder shape for installation as an embeddable discrete, galvanic anode and is designed to be installed into drilled holes within the concrete.


The anodes are installed with a purpose formulated, ion-conductive, auto moistening Zinc Activation Paste (ZAP) which surrounds the anode within the drilled hole and provides direct, electrochemical contact between the anode and the concrete surface. When connected to the embedded reinforcement, the zinc foil corrodes at the humectant/activator layer and provides galvanic cathodic protection to the surrounding embedded reinforcement.

ZLRA is capable, of stopping and preventing corrosion of reinforcement within chloride contaminated or carbonated structures, preventing the need for removal and replacement of sound, undamaged chloride contaminated or carbonated concrete.


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


ZLRA and the activation paste do not contain any chlorides or chemicals which are harmful to the structure, personnel or the environment.



ZLRA 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.


ZLRA can be used in conjunction with the surface applied, Zinc Layer Anode (ZLA) to provide enhanced protection in restricted access areas, which prevent direct access of the concrete surfaces, such as bearing shelves, joints or other areas requiring protection remote from the concrete surface.