Our Role in Post-Tensioning Projects. At NRSC Engineering Co., LTD we provide comprehensive post-tensioning services — from casting yard preparations to on-site execution — ensuring structural integrity, safety, and precision in every stage.

Casting Yard Services: What We Do
• Sheath Duct Installation: We carefully place protective tubes (called sheath ducts) inside the concrete forms. These tubes will later house the steel cables (tendons) and protect them from damage and corrosion.
• PC Strand Installation & Stressing: After the concrete is poured and cured, we thread high-strength steel cables (called prestressing or PC strands) through the sheath ducts. Using hydraulic jacks, we pull these cables tight (called stressing) to compress the concrete, which makes the structure stronger and less likely to crack.
• Grouting: Once the cables are stressed, we pump special grout (a cement-based mixture) into the ducts to fill any empty space. This seals the cables inside, protecting them from moisture and corrosion, ensuring long-term durability.

On-Site Execution: Our Responsibilities
• PT-Bar, Duct, and Bearing Plate Installation: On the construction site, we install the post-tensioning bars (PT bars), ducts for the tendons, and bearing plates — which transfer the forces safely into the concrete.
• Duct Setting: We position and secure the ducts exactly where they need to be inside the concrete forms, ensuring the tendons will follow the designed path for maximum efficiency.
• PC Strand Installation & Stressing: Just like in the casting yard, we thread and tension the steel cables on-site for structural components cast there, ensuring the bridge elements are properly reinforced.
• Tendon Grouting: Finally, we pump grout into the ducts on-site to protect and lock the stressed tendons in place, preventing corrosion and bonding them to the concrete.

Stronger structures, smarter design.
Post-tensioning plays a key role in modern construction—reducing cracking, increasing span lengths, and optimizing material use. Whether you are an engineer, student, or client exploring efficient building solutions, this quick video breaks it down simply and clearly.

Watch now to see post-tensioning in action.