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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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Classic CasesBrowse our portfolio of successful infrastructure projects. From domestic water diversion systems to international railway construction, see how Ruibaolong steel wire powers global engineering.
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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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NEWS CENTER
Blog
02
2026
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03
Achieving 35mm Ultra-Thin Precast Slabs: The Critical Role of 1570MPa Stress-Relieved Wire
Introduction: The Revolution of Lightweight Precast
In the competitive landscape of 2026 global infrastructure, "Lightweighting" is the ultimate goal for profitability. The adoption of PK3 Composite Slabs in major projects, such as the Haikou Urban Renewal Project, has set a new global benchmark. By replacing traditional reinforcement with 1570MPa Stress-Relieved PC Wire, engineers have achieved what was once considered impossible: a fully structural base plate only 35mm thick.
The Science of "Thinness": Why 35mm is a Game Changer
For precast plants, every millimeter saved in slab thickness translates directly into bottom-line profit. But the transition from a standard 60mm slab to a 35mm PK3 slab is not just a dimensional change—it’s a material science upgrade.
According to 2026 simulation data and field testing, the 35mm ultra-thin design offers:
| Benefit | Impact |
|---|---|
| Radical Dead Load Reduction | A 30% reduction in self-weight, significantly lowering the requirements for cranes and structural columns. |
| Unmatched Material Efficiency | Concrete consumption drops by 42%, and material costs are optimized by 15%–20%. |
| Carbon Footprint Impact | Savings of approximately 28kg of CO2 per square meter, aligning with international green building certifications. |
For precast concrete plants and developers, these reductions not only translate to significant material savings but also enable faster construction timelines and reduced transportation costs due to the lighter weight of each slab.
The Critical Bottleneck: Why Traditional Rebar Fails in Thin Sections
Why can't we use standard Grade 60 Rebar for these ultra-thin slabs? The reason is twofold: Anchorage and Geometric Constraints.
Bond Strength: In a 35mm section, there isn't enough concrete cover to protect thick rebar or provide sufficient friction.
Stiffness Degradation: Traditional steel often leads to excessive "mid-span deflection" (挠度) in thin sections.
This is where Ruibaolong’s 1570MPa Stress-Relieved PC Wire comes into play. Our wire provides a higher strength-to-cross-section ratio, allowing for a thinner yet stiffer structural core that meets the stringent performance requirements of ultra-thin precast slabs.
Ruibaolong’s Engineering Edge: Ductility as the Proactive Safety Margin
The 2026 academic focus (Xu et al.) highlights that for a 35mm slab to be structurally sound, the displacement ductility coefficient must exceed 3.5. Ruibaolong’s manufacturing process is specifically tuned to deliver this "Strong Ductility":
In-Line Stabilization (Stress-Relief): Our wire undergoes advanced thermo-mechanical treatment to eliminate "coil memory." This ensures the wire lays perfectly flat during the tensioning of PK3 slabs, preventing micro-cracks in early-age concrete.
Superior Bond Interface: With a tested bond strength of ≥1.5MPa, Ruibaolong wire ensures that the steel and concrete act as a single, monolithic unit (Coordination Coefficient ≥ 0.9).
Energy Absorption: In seismic simulations, our 1570MPa wire demonstrates a stable plastic stage, meaning the slab will deform and warn occupants long before a failure occurs.
FAQ: Technical Insights for Precast Engineers
Q1: Does high tensile strength (1570MPa) make the wire more brittle?
A: Not if it's Ruibaolong's Stress-Relieved Wire. While many standard high-tensile wires are brittle, our stabilization process ensures a ductility coefficient > 3.5, meeting the "Strong Ductility" requirements for modern seismic codes.
Q2: How does 35mm thickness affect the fire resistance and serviceability?
A: Simulations show that when combined with a steel tube truss (as in PK3 systems), the 1570MPa wire maintains structural integrity. The max deflection-to-span ratio is kept within 1/250, ensuring the slab remains functional under full live loads.
Q3: Can this wire improve factory throughput?
A: Absolutely. The high straightness and consistent diameter of RBL wire reduce downtime on automated welding and tensioning lines, allowing plants to reach their theoretical maximum output.
Conclusion: Investing in the Foundation of 2026
The shift to ultra-thin PK3 slabs is no longer a "future concept"—it is the current standard for cost-optimized, green construction. By choosing Ruibaolong’s 1570MPa Stress-Relieved Wire, you are not just buying steel; you are buying the engineering certainty required for the next generation of infrastructure. As projects continue to push the boundaries of sustainability and efficiency, Ruibaolong stands ready to provide the critical reinforcement that ensures safety, performance, and cost-effectiveness.
Technical Reference: Based on "Mechanical Performance Simulation Analysis of PK3 Composite Slabs" (Haikou Urban Renewal Project, 2026).
👉 [Contact Ruibaolong’s Engineering Team for PK3 Slab Reinforcement Consultation]
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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.
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Email: globaltrade@rblprestress.com
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