Multistrand Anchor

Corrosion Protection

A wide variety of corrosion protection options are available to choose from, depending on the expected length of service and the aggressiveness of the environment.


Single Corrosion Protection SCP (Type A)

SCP Anchors are used for temporary applications and sometimes for permanent applications in non-aggressive environments. In the bond length, cement grout covers the bare strand. The protection in the free stressing length depends on whether single stage grouting or two-stage grouting is used. For single stage grouting, the free stressing length of each strand is coated with a layer of corrosion preventive grease over which a tough seamless layer of polyethylene is extruded. Grease never comes in contact with the grout in the free stressing length, so the bond length is not affected. For two stage grouting, the grease and PE coating can be omitted. DSI does not recommend the use of bare strand in the free stressing length where the free stressing length remains ungrouted.

(image: anchor type A; SCP; Single Stage Grouting; 2 to 61 Strands)

Double Corrosion Protection DCP (Type B)

DCP Anchors are used for permanent applications and in aggressive or uncertain environments. The strand bundle in the bond length is grouted into a corrugated PE or PVC duct while the individual strands in the free stressing length are greased and sheathed in polyethylene. Quality control may be enhanced by pre-grouting the bond length under factory conditions. Drill hole size and cost are significantly influenced by the clearance required by the outer PE duct.

(image: anchor type B; DCP; Single Stage Grouting; 2 to 27 Strands)

Double Corrosion Protection DCP (Type C)

Corrosion protection for the anchor tendon can be improved by extending the outer corrugated PE or PVC duct over the free stressing length. In this case, pre-grouting of the anchor inside the plastic duct is not recommended because of difficulties which might be encountered during transportation and placing.

(image: anchor type C; DCP; Single Stage Grouting; 2 to 27 Strands)

Double Corrosion Protection DCP (Type D)

The ideal protection for strand anchors is one in which the strand is totally and permanently protected from the time of manufacture throughout its life. Such protection is provided by epoxy coating the individual strands both externally and internally. Flo-bond Flo-fil ® is a rugged, thermally bonded polymer coating that offers maximum corrosion protection, with a bond strength that exceeds that of bare strand. When two-stage grouting is used, no additional corrosion protection is required even in applications where the free stressing length will remain ungrouted for an extended period of time.

(image: anchor type D; DCP; Two Stage Grouting; 2 to 61 Strands)

Double Corrosion Protection DCP (Type E)

For anchors in which single stage grouting is desirable, the free stressing length of epoxy-coated strand anchors can be coated with a lubricating grease and encased in a seamless extruded PE sheath.

(image: anchor type E; DCP; Single Stage Grouting; 2 to 54 Strands)