Bonded Slab Post-Tensioning

Bonded Slab Post-Tensioning Systems

Featuring the same benefits as bonded multistrand post-tensioning, our bonded slab systems utilize flat ducts to maximize eccentricity of the prestressing and to reinforce slabs as thin as 5″. Bonded slab systems allow for future modifications, such as drilling, coring, and openings. When bonded prestressing steel is cut it behaves similar to rebar in that the loss of force is localized. These systems are used in a variety of applications, including parking deck slabs to enhance long-term durability, transfer slabs, containment structures, and bridge decks.

bonded slab anchorage

VSL 2C Whitetext

STRUCTURAL TECHNOLOGIES is the exclusive manufacturer of VSL post-tensioning products and construction systems in the United States. Our manufacturing facilities in the United States are certified by PTI’s Plant Certification Program to ensure the highest quality fabrication of materials.

Key Advantages

bonded slab spans

Design advantages include increased span lengths, thin slabs, and improved load-carrying capacities.

bonded slab pt schematic

Strands are protected by the grout, duct, and surrounding concrete. Bonded slabs also allow designers to significantly reduce the use of conventional steel reinforcement, particularly at the top of the slab.

bonded pt slab opening

Bonded systems offer more flexibility regarding structural modifications such as openings for stairwells, utility access, and future expansion. If a tendon needs to be cut, the loss of tendon force would be localized. The remainder of the tendon would retain its force at the development length away from the failure point and would remain functional.

VSL Bonded Slab Products

ProductDescriptionTechnical Data
SOStressing AnchoragePDF
VSLAB+ ®Fully encapsulated anchorage systemPDF
SAStressing AnchoragePDF
NStressing AnchoragePDF
ProductDescriptionTechnical Data
PT-PLUS™Proprietary plastic duct and coupler systemPDF
Strand Properties
ProductDescriptionTechnical Data
StrandPost-tensioning strand and tendon propertiesPDF
ProductDescriptionTechnical Data
Type I (ZPE-23FJ)Post-Tensioning Stressing JackPDF
Type II (ZPE-19)Post-Tensioning Stressing JackPDF
Type III (ZPE-500)Post-Tensioning Stressing Jack PDF

Post-Tensioning Engineering Support

Post-Tensioning Expertise

STRUCTURAL TECHNOLOGIES’ post-tensioning specialists are committed to bringing innovation to complex projects. Our in-house design professionals have extensive experience in structural design and are active members of technical organizations such as the Post Tensioning Institute (PTI) and the American Concrete Institute (ACI).

Post-Tensioning Team Leader

Read more about our products and applications on our post-tensioning solution builder page

john cringler headshot
Design-Assist & Engineered Product Support

• Investigation Support
• Solution Development
• Budget Development
• Specification Assistance
• Constructability Consulting
• Application Engineering
• Quality Control Programs
• Project-Specific Design-Assist


• Preliminary Designs
• Feasibility Studies
• Budget Development
• Optimization of Structural Geometry
• Specification Development


• P-T System Selection
• Customized P-T System Design
• P-T Element Design & Detailing Support
• Integrated Shop Drawings & Building Information Modeling (BIM)
• Quality Control Plan Development


• P-T System Installation Support
• Project Coordination
• Manufacturing & Material Supply
• Equipment Rental
• Safety Planning