VSL’s VSLAB ^® Bonded Post-Tensioning Slab System consists of fully encapsulated, bonded multistrand (two to five strands) tendons contained in flat plastic ducts filled with a high-performance cementitious grout that bonds the strands to the surrounding concrete. Intermediate anchorages provide continuous encapsulation at construction joints. Tendons are protected by both PT-Plus™ plastic duct and grout.

These bonded multistrand post-tensioning systems have been successfully applied to commercial building, healthcare and parking structure construction by VSL. Benefits include enhanced crack and deflection control and a reduction in reinforcing steel. VSLAB allows for thin post-tensioning slab design—reducing overall building height which lowers costs for foundation, frame and facade/cladding components. Because bonded tendons may be cut with only localized loss of capacity, another significant advantage of VSLAB is the ease of future building modifications. Design advantages include increased span lengths and load-carrying capacities.

Additionally, the reduction of mild reinforcing steel minimizes the primary sources of corrosion and significantly reduces life cycle maintenance costs.

Bonded Slab Case Studies