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Bar post-tensioning systems
Bar Post-Tensioning Systems
Smooth steel stressing bar with rolled thread
The BBV 1030 (steel grade St 835/1030) bar tensioning system complies with the ETAG 013 guideline and EAD 160004-00-0301. The bar is suitable for stressing, repairing and strengthening of reinforced concrete and/or composite structures. Depending on the project criteria the bar system can be used internally (with or without bond) or externally to the structure.
The smooth or threaded steel bars are hot-rolled and then stretched in the manufacturing process and achieve a fatigue strength equivalent to Class 1 of the specifications. Furthermore, the bars are designated as equivalent to a prestressing steel Y-1030-H according to pr EN 10138-4 and are suitable for application in Germany under the building approval Z-124-138.
The smooth bars are cut to the ordered length and then provided with a cold-rolled thread. The smooth bars can also be delivered with a continuous thread if required.
Bonded bar tendons
Bonded bar tendons are installed within the structural concrete of the structure. Bonding and corrosion protection of the bars is achieved by grouting the tendon in accordance with the provision of DIN EN 447.
Unbonded bar tendons, internal or external
Unbonded tendons are installed either inside or outside the structures cross-section. Corrosion protection is achieved by adding a anti-corrosion compound or shrink sleeve. For unbonded bars used in temporary operations, a protective coating can be applied in accordance with DIN EN ISO 12944-5. The advantage with unbonded tendons is the bars can be de-tensioned, re-tensioned and replaced as required.
