Double Corrosion Protection

BS8081 defines permanent anchors as installations with lifespans in excess of 2 years. In order to achieve this status, sufficient corrosion protection needs to be provided. To ensure durability throughout the working life of each anchor, double corrosion protection needs to be provided. Double corrosion protection (DCP) is defined in BS8081 and consists of factory pre-grouted encapsulation of the bar within a corrugated plastic sheath.

DYWIDAG DCP Anchors are capable of providing consistent performance for 120 years. The specialist coupler and head assembly details ensure that a consistent double corrosion protection is provided for the full anchor length.

DCP head details are fully enclosed and incorporate a steel protection cap for the anchor head which is filled with a water resistant grease. Depending on maintenance requirements over the anchor lifespan, the stressing length can be left long to permit regular liftoff tests. For longer stressing lengths, a longer protection cap can also be provided.

Borehole grout is not recognised by current anchor standards (BS8081 or EN1537) as a corrosion protection barrier due to its susceptibility to contamination and potential inconsistency.