Multi-strand Post-Tensioning System. PT-PLUS duct system.

The VSL PT-PLUS® duct system is used for internal bonded tendons. By providing a leak-tight barrier, it meets the requirements for enhanced corrosion protection (PL 2).

In addition, the PT-PLUS® system can be fitted with additional details at the anchorage to provide electrically isolated tendons (EIT) and a protection level PL 3, which results in the most durable and sustainable solution in the market.

The PT-PLUS® ducts are made of polypropylene. The corrugated shape of the duct provides bond between the tendon (grout) and the surrounding concrete of the structure.

Compared to the corrugated steel duct, the use of PT-PLUS® duct features improve structural behaviour of the post-tensioned tendon under fatigue loading.