PC Strand
The steel backbone of modern prestressed concrete — KIDL’s PC Strand delivers unmatched tensile strength, minimal relaxation, and consistent performance in every beam, slab, bridge, and tower it reinforces.
Product Type
7-Wire Low Relaxation
Nominal Diameter
9.5 mm – 15.7 mm
Tensile Strength
1770 – 1960 MPa
Relaxation Class
Class 2 (Low Relaxation)
Standard
ASTM A416 / BS 5896 / EN 10138
Overview
PC Strand (Prestressed Concrete Strand) is a high-strength steel wire product used as the primary tensioning element in prestressed and post-tensioned concrete structures. Composed of seven cold-drawn steel wires helically wound around a central wire, it combines exceptional tensile strength with outstanding ductility and minimal stress relaxation over time.
KIDL supplies premium 7-wire low-relaxation PC Strand manufactured under strict quality control to international standards. Our strand maintains consistent mechanical properties across every coil, ensuring predictable prestress force, safe anchorage seating, and long-term structural integrity in even the most demanding engineering environments.
From precast factory production to on-site post-tensioning, KIDL’s PC Strand is the trusted choice for engineers who demand precision, performance, and reliability in every metre of strand they use.
Specifications
| Parameter | Detail |
|---|---|
| Construction | 7-wire helically wound strand |
| Nominal Diameter | 9.5 mm, 11.1 mm, 12.7 mm, 15.2 mm, 15.7 mm |
| Tensile Strength (UTS) | 1770, 1860, 1960 MPa (grade-dependent) |
| Yield Strength (0.1% proof) | ≥ 90% of UTS |
| Elongation at Break | ≥ 3.5% |
| Relaxation Class | Class 2 — Low Relaxation (≤ 2.5% at 1000 hrs) |
| Modulus of Elasticity | 195 ± 10 GPa |
| Surface Condition | Plain / Indented / Epoxy-coated / Galvanized |
| Coil Weight | Typically 1000 – 2000 kg per coil |
| Standards | ASTM A416, BS 5896, EN 10138-3, BNBC |
Applications
- Prestressed Bridge Girders
- Post-tensioned Building Slabs
- Precast Concrete Beams
- Retaining Walls & Piles
- Transmission Poles & Pylons
- Tunnel Lining Systems
- Railway Sleepers & Track
- Water Tanks & Silos
Advantages
Installation
1. Duct Layout & Profile Setting
Install corrugated metal or HDPE ducts along the designed tendon profile inside the formwork. Fix at regular chair intervals to maintain the correct drape and prevent displacement during concreting.
2. Strand Cutting & Preparation
Cut PC Strand to the required length using a disc cutter or hydraulic shear — never flame cut, as heat damages the wire surface. Confirm correct protrusion length at the stressing end.
3. Threading Through Duct
Feed strands through the duct one by one, or use a strand-pushing machine for long tendons. Ensure strands are free of kinks, corrosion, and surface damage before threading.
4. Concreting & Curing
Pour concrete and cure to the minimum required strength specified in the stressing programme — typically 75–80% of design compressive strength — before any stressing is performed.
5. Stressing Operation
Attach the calibrated hydraulic jack to the live end anchorage. Apply tension in incremental stages per the approved stressing schedule. Record jack pressure and elongation at each stage and verify against theoretical values.
6. Grouting & Protection
Immediately after stressing, inject cement grout into the duct to encapsulate the strand fully. For unbonded tendons, ensure the factory-applied grease and HDPE sheath are undamaged and intact along the full length.
