Contact Info
- Tel: +86-311-87813582
- Fax: +86-311-87829648
- Email: Kaiwork@126.com
- Whatsapp: +86 86 138 3318 2035
- Add: No.345, Youyi North Street, Shijiazhuang City, Hebei Province, China.
Dual-Advantage Post-Tensioned Infrastructure Grade. Engineered specifically for large-span beams, continuous box girders, and heavy structural transfer slabs, our 15.24mm (0.6 inch) retarded bonded prestressed concrete steel strand combines the construction flexibility of unbonded tendons with the long-term ultimate structural composite action of bonded systems, delivering certified compliance and superior structural efficiency.
15.24mm Retarded Bonded PC Strand | Advanced Delayed-Bond Tendon for Large-Span Beams
​Designed for critical long-span structural systems requiring delayed bonding and high ultimate load capacity. Every coil adheres to stringent international mechanical and chemical benchmarks.
|
Technical Parameter |
Specification Value |
Governing Standard |
|
Nominal Diameter |
15.24 mm (0.600 inch) |
ASTM A416 / ISO 6934-4 |
|
Strand Configuration |
7-Wire (1 Center Wire + 6 Helical Outer Wires) |
ASTM A416 / BS 5896 |
|
Nominal Cross-Sectional Area |
140.0 mm² (0.217 in²) |
ASTM A416 |
|
Specified Tensile Strength |
Grade 270 (1860 MPa High Tensile) |
ASTM A416 |
|
Minimum Breaking Load (MBL) |
≥ 260.7 kN (58,600 lbs) |
ASTM A416 |
|
Bonding Technology |
Retarded Bonding Compound (Delayed Hardening) |
Specialized PT Technical Specs |
|
Relaxation Class |
Class 2 (Low Relaxation, Max 2.5% at 1000h) |
JIS G3536 |
· ​Construction Flexibility + Composite Strength: Functions as an unbonded tendon during placement and stressing (allowing friction-free tensioning), then chemically cures and bonds with surrounding concrete over time to act as a fully bonded tendon.
· ​Heavy-Duty Load Capacity for Large Spans: Built upon a robust 1860 MPa, 140.0 mm² high-tensile steel core, providing the massive ultimate breaking load (260.7 kN) required for massive beam spans and heavy loads.
· ​Enhanced Ultimate Shear & Crack Control: Once fully bonded, it distributes stresses evenly along the entire tendon length, significantly improving crack resistance and ultimate load-bearing capacity compared to conventional unbonded systems.
· ​Full Metallurgical Traceability: Manufactured under strict ISO 9001 protocols. Each commercial shipment includes a comprehensive Mill Test Certificate (MTC) verifying tensile strength, elongation, and compound activation timelines.
​Engineered for high-performance structural systems requiring advanced prestressing techniques:
· ​Large-Span Bridge Beams: Precast concrete box girders, highway T-beams, railway bridges, and continuous rigid frame structures.
· ​Commercial & Industrial Buildings: Long-span floor beams, heavy transfer girders, stadium roofs, and multi-story parking structures.
· ​Specialized Infrastructure: Nuclear containment structures, LNG tanks, and underground structures requiring high structural redundancy.
​Q: How does a retarded bonded strand differ from standard unbonded or bonded strands?
A: It features a special retarded bonding compound coating. During construction and stressing, it behaves like an unbonded strand (easy to tension). Over a controlled period, the compound hardens and bonds the strand to the surrounding concrete, achieving the structural efficiency of a bonded tendon.
​Q: Does the base steel strand comply with international standards?
A: Yes. The underlying 7-wire strand complies strictly with ASTM A416 Grade 270 or ISO 6934-4, ensuring complete mechanical reliability according to global civil engineering standards.
​Q: What is the standard export packaging and protection?
A: Coils are carefully wrapped with heavy-duty protective materials and moisture barriers, secured with high-tensile steel strapping, and palletized to ensure the integrity of the specialized coating during transit.
