What is the difference between bonded and unbonded tendons?

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Bonded vs Unbonded Tendons: What's the Difference?

Bonded Tendons

Bonded tendons are commonly used in precast concrete construction. In bonded tendons, the prestressing steel is placed in a metal or plastic duct within the concrete. The duct is then filled with grout to bond the tendon to the surrounding concrete. This bonding between the tendon and the concrete allows the prestressing forces to be transferred efficiently, resulting in a stronger and more durable structure.

Unbonded Tendons

Unbonded tendons, on the other hand, are typically used in cast-in-place concrete construction. In unbonded tendons, the prestressing steel is located within a plastic or steel duct that is not bonded to the concrete. Instead, the tendon is able to move freely within the duct, allowing for easier installation and stressing of the tendon. While unbonded tendons may be easier to install, they do not transfer prestressing forces as efficiently as bonded tendons.

Key Differences

The main differences between bonded and unbonded tendons lie in their construction and the way they transfer prestressing forces to the concrete. Bonded tendons are fully bonded to the concrete, allowing for efficient transfer of forces, while unbonded tendons are free to move within their ducts, resulting in less efficient force transfer. Additionally, bonded tendons are typically used in precast construction, while unbonded tendons are more common in cast-in-place construction.In conclusion, the choice between bonded and unbonded tendons depends on the specific requirements of the construction project. Bonded tendons offer better force transfer efficiency and are commonly used in precast construction, while unbonded tendons provide easier installation and are more common in cast-in-place construction. Ultimately, both types of tendons have their own advantages and are selected based on the structural needs of the project.

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