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ProductsDiscover Ruibaolong's full range of High-Performance PC Steel Wire, PC Steel Bar, and Cold Drawn Wire. We specialize in SWRH82B Spiral Ribbed, Plain, and Indented surfaces, as well as Hose Reinforcement Wire. ISO 9001 certified manufacturer for PCCP and infrastructure projects.
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About UsTianjin Ruibaolong Prestressed Steel Strand Co., Ltd. is a leading ISO 9001 certified manufacturer established in 2010. We specialize in producing and exporting high-quality PC wire and steel bars globally.
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BlogAbout Ruibaolong We are a professional metal products manufacturer dedicated to High-Performance PC Steel Wire. With a strong market network covering China and an expanding global footprint, we supply essential materials for bridges, buildings, and infrastructure. Here, we share our journey in connecting the world with strength and durability.
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Blog
08
2026
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01
Essential Guide: Why CRTS III Ballastless Tracks Require Spiral Ribbed PC Wire
1. Introduction — The Hidden Steel That Holds the Track Together
Modern high-speed rail systems have evolved from ballasted tracks to advanced ballastless slab track structures. Among them, CRTS III (China Railway Track System Type III) is one of the most widely applied designs.
Beneath each concrete slab lies a critical structural material:
High-tensile Spiral Ribbed PC Wire — the core tendon of bi-directional prestressing.
Without the right prestressing wire, the slab cannot maintain long-term stability under:
high-frequency train vibration
temperature cycling
long-term fatigue stress
This article explains why Spiral Ribbed PC Wire — rather than rebar or strand — is the engineering-preferred solution for CRTS III slab tracks.
2.The Engineering Challenge — Bi-Directional Prestressing in Large Slabs
CRTS III slabs are typically large thin-section structures (≈ 5.6 m × 2.5 m) subjected to repeated dynamic loads.
To prevent cracking, engineers apply bi-directional prestressing:
Longitudinal direction — controls bending from wheel loads
Transverse direction — prevents edge & corner cracking
This requires a reinforcement material that is:
strong enough for 1470–1570 MPa prestress
flexible enough to form dense grid layouts
capable of high bonding performance to prevent slip
Spiral Ribbed PC Wire meets all three requirements.
3.Why Spiral Ribbed PC Wire Is Preferred Over Rebar & Strand
Standard rebar and PC strand present practical limitations in slab-track structures.
Material Comparison Table
| Feature | Rebar | PC Strand | Spiral Ribbed PC Wire (Recommended) |
|---|---|---|---|
| Tensile Strength | 400–500 MPa | 1860 MPa | 1470–1570 MPa |
| Flexibility in Grid Layout | Poor | Difficult | Excellent |
| Anchorage in Thin Slabs | Hard to design | Complex anchorage | Simple & reliable |
| Crack Control | Passive | Good | Excellent (Active prestressing) |
| Suitability for CRTS III | ❌ No | ⚠️ Limited | ✔ Widely adopted |
Engineering takeaway:
Rebar is too weak. Strand is difficult to anchor in thin slabs.
Spiral Ribbed PC Wire offers the optimal balance of strength, flexibility, and structural control.
4.Why the Spiral Ribbed Surface Is Necessary
The helical ribbed profile provides:
mechanical interlock with concrete
higher bond strength than smooth wire
uniform stress transfer along the tendon
This improves:
crack resistance
fatigue durability
long-term prestress retention (60+ years design life)
5.Ruibaolong Railway-Grade PC Wire Performance Standards
At Ruibaolong (RBL), our PC Wire is engineered for long-service slab track applications.
Technical Parameters
| Parameter | Specification |
|---|---|
| Diameter Range | 4.0–12.0 mm (Customizable) |
| Typical Application Sizes | 8–12 mm (incl. 9mm / 10mm / 11mm) |
| Strength Grades | 1470 / 1570 / 1670 MPa |
| Surface | Spiral Ribbed (Helical) |
| Relaxation (1000h) | ≤ 2.0% |
| Fatigue Test | 2 million cycles |
| Supply Form | Coils or Cut-to-Length |
Supporting documents & logistics:
Mill Test Certificates (MTC)
Waterproof export packing
Large-ID coils for prestressing equipment
6.Conclusion
In CRTS III slab track systems, prestressing material selection directly affects life-cycle safety and durability.
Spiral Ribbed PC Wire delivers:
reliable bonding performance
excellent fatigue resistance
stable prestressing force retention
It is not just reinforcement — it is the structural tendon of slab-track mechanics.
Not sure which prestressing material is right for your project? Read our comprehensive comparison: [Spiral Ribbed PC Wire vs Plain Wire & Strand — Choosing the Right Material for Precast Concrete] to understand the bonding differences.
FAQ — PC Wire for CRTS III Slab Tracks
Q1. Why not use PC Strand instead of PC Wire?
A:PC strand requires larger anchorage and thicker cover, which is unsuitable for thin slab structures.
Q2. Why is Spiral Ribbed better than Plain Wire?
A:The ribbed profile provides mechanical interlock, preventing slip under vibration — essential for railway safety.
Q3. What diameters are typically used?
A:We supply 4.0–12.0 mm, with 8–12 mm most common depending on slab design and prestress layout.
Q4. Can Ruibaolong supply cut-to-length PC Wire?
A:Yes — both coil form and cut-to-length are available for precast production lines.
Q5: Why is spiral ribbed PC wire mandatory for CRTS III ballastless tracks?
A: CRTS III track slabs endure extreme dynamic impact from high-speed trains. Spiral ribbed PC wire is required because its helical surface provides superior anchorage and prevents longitudinal slip within the concrete, ensuring the track slab maintains strict dimensional stability without cracking over decades of fatigue loads.
📩 CTA
Not sure which prestressing material is right for your project? Read our comprehensive comparison:
to understand the bonding differences.
Planning a railway or slab-track project?
Contact Ruibaolong for technical specifications or feasibility support.
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Tianjin Ruibaolong Prestressed Steel Strand Co., Ltd. is one of the professional manufacturers specializing in the research, development, production, and operation of prestressed steel wires, cold-drawn steel wires, and steel wires for roll welding machines.
Address: No. 3, Tianyu Road, Tianyu Science and Technology Park, Jinghai District, Tianjin
Email: globaltrade@rblprestress.com
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