System Stressing and Grouting

Our highly trained field leadership provides expertise in all areas of post-tensioning installation services– including stressing and grouting operations.

Tendon Inspection & Vacuum Grouting

Working under ANSI guidelines, STRUCTURAL TECHNOLOGIES uses a statistical approach to random sampling during investigation. Using non-destructive Ground Penetrating Radar (GPR) and field layout drawings, we can locate existing post-tensioning tendons for inspection. The use of a borescope allows for detailed visual inspection and captured video footage can be shared with the owner and the engineer. Where voids are found, they are documented and filled using one of several grouting methods:

  • Vacuum grouting
  • Vacuum-assisted grouting
  • Pressure grouting






STRUCTURAL TECHNOLOGIES, a Structural Group company, is the exclusive designer and manufacturer of VSL post-tensioning and  construction systems in the United States. VSL systems have a well-earned reputation for their quality, reliability, and durability - and have been used throughout the world since 1956 to build, repair, and strengthen bridges, buildings, tanks, and special structures. For information on VSL products outside of the United States, visit the VSL International website

With companies dating back to 1902, Structural Group is firmly committed to its ongoing mission of making new and existing structures stronger and last longer. Through its companies, Structural Group delivers turnkey solutions that integrate technology, engineering, and construction. Structural Group provides specialty contracting services through our construction companies and state-of-the-art proprietary products and engineering support services through STRUCTURAL TECHNOLOGIES.

Learn more about Structural Group and its member companies.

VSL is the registered trademark of VSL International Ltd.