KGN

Introduction to Unbonded
Slab Post-Tensioning

Unbonded post-tensioning strengthens concrete while allowing
flexible reinforcement. Steel tendons coated with grease or plastic
remain unbonded to the concrete, enabling adjustments and
replacements. Once the concrete reaches sufficient strength,
tendons are tensioned with hydraulic jacks, enhancing load
capacity. This method is ideal for buildings, bridges, and parking
structures, offering durability and fast construction.

Key Characteristics of Unbonded
Post-Tensioning:

Flexible Tendons for Easy Adjustments & Adaptability

Allows tendon movement for stress redistribution, design flexibility, and easy replacements.

Faster Installation with No Grouting & Simplified Process

Eliminates grouting, reducing labor, speeding installation, and improving efficiency.

Reduced Maintenance with Corrosion-Resistant Coating

Protective sheathing prevents moisture, minimizing corrosion and ensuring durability.

Positioning of PE-Coated Tendons Within the Concrete Formwork

Pouring Concrete and Allowing it to Cure to Required Strength

Applying Tension to the Tendons Using Hydraulic Jacks

Securing the Stressed Tendons Firmly with Anchorages

Performing Final Adjustments and Grouting for Protection if Needed

Design & Engineering of
Unbonded Post-Tensioning

Unbonded post-tensioning follows a systematic process to ensure structural integrity and flexibility. This
method involves placing pre-coated tendons, tensioning them after the concrete cures, and securing
them without permanent bonding to the concrete.

Positioning of PE-Coated Tendons Within the Concrete Formwork

Pouring Concrete and Allowing it to Cure to Required Strength

Applying Tension to the Tendons Using Hydraulic Jacks

Securing the Stressed Tendons Firmly with Anchorages

Performing Final Adjustments and Grouting for Protection if Needed

Design & Engineering of
Unbonded Post-Tensioning

Positioning of PE-Coated Tendons Within the Concrete Formwork

Pouring Concrete and Allowing it to Cure to Required Strength

Applying Tension to the Tendons Using Hydraulic Jacks

Securing the Stressed Tendons Firmly with Anchorages

Performing Final Adjustments and Grouting for Protection if Needed

Advantages of Unbonded
Post-Tensioning

Bonded slab post-tensioning offers a high-performance
structural solution that enhances strength, durability, and
efficiency. By integrating grouted tendons, it ensures
better load distribution, crack control, and long-term
reliability, making it ideal for high-rise buildings,
commercial floors, and large-span structures.

Applications of Unbonded
Post-Tensioning

Bridges &
Flyovers

Parking
Structures

Residential &
Commercial Buildings

Industrial
Floors & Slab