Unbonded Steel Strand for Pre-stressed Concrete

Unbonded Steel Strand: High-Performance Prestressed Solution for Modern Construction Discover Chunpeng Group’s premium Unbonded Steel Strand — a cutting-edge prestressed concrete component engineered for superior durability, simplified installation, and enhanced structural integrity. Designed with a core of 7 high-strength steel wires (1860MPa tensile strength) encased in a protective HDPE sheath filled with anti-corrosion grease, this product offers a reliable alternative to traditional bonded systems. Ideal for demanding environments such as marine infrastructure, seismic zones, and large-span architectural projects, our unbonded strands ensure long-term performance without compromising on construction efficiency. Key Features: - Non-bonded design enables sliding action under load, minimizing stress concentration and preventing crack propagation - Dual-layer corrosion protection through HDPE jacketing and lubricating grease ensures longevity in aggressive conditions - Streamlined installation process eliminates the need for ducts or grouting, reducing labor time and costs - Uniform stress distribution enhances crack resistance and ductility, critical for safety-critical structures - Easy maintenance and replacement capabilities make it ideal for retrofitting existing buildings Detailed Description: Unlike conventional bonded prestressing tendons that rely on grout-filled ducts for force transfer, Chunpeng’s unbonded steel strand operates independently within the concrete matrix. This allows controlled movement during tensioning, ensuring consistent performance even when environmental stresses occur. The proprietary high-density polyethylene (HDPE) coating acts as a physical barrier against moisture, chlorides, and chemical exposure, while the internal grease provides continuous lubrication to maintain smooth slippage. With over three decades of expertise in producing PC steel materials, we combine advanced metallurgy, precise manufacturing, and rigorous quality control to deliver products that meet international standards like ASTM A416, EN 10138, and ISO 10138. Application Scenarios: This versatile solution is widely used across global civil engineering sectors: - Large-scale commercial buildings (e.g., stadiums, airports, shopping centers) where clear spans and minimal beam depth are essential - Bridge rehabilitation and new external post-tensioning systems, especially in coastal regions exposed to saltwater - Nuclear containment structures requiring extreme durability and radiation resistance - Liquid storage tanks (water, oil, chemicals) where leak prevention is paramount - Permafrost regions where thermal cycling demands flexible reinforcement - Seismic retrofitting projects benefiting from ductile behavior and energy dissipation User Feedback: Engineers and contractors worldwide praise the material’s ease of handling and robustness. One project manager noted, “We reduced construction time by nearly 30% compared to traditional methods, and the visual quality of the slab remains flawless.” Another user highlighted its reliability in a marine bridge project: “Even after five years in a salty environment, no signs of degradation were observed—this is truly future-proof engineering.” Frequently Asked Questions: What makes unbonded steel strand different from bonded tendon systems? It doesn’t require grouting; instead, it relies on mechanical anchorage at both ends and sliding action within the concrete, offering better stress uniformity and easier inspection. Is it suitable for high-corrosion areas? Yes—it features a sealed system with HDPE sheathing and grease, making it ideal for coastal, industrial, or chemically aggressive environments. Can it be used in existing structures? Absolutely—it's commonly applied in strengthening older buildings without disrupting original components, particularly effective in seismic upgrades. How does it improve structural safety? By distributing forces more evenly across the member, it reduces localized stress peaks and increases resistance to cracking, especially under dynamic loads. In summary, Chunpeng Group’s Unbonded Steel Strand represents a paradigm shift in prestressed concrete technology—offering unmatched durability, adaptability, and construction efficiency. Whether building new infrastructure or upgrading legacy assets, this innovative solution delivers lasting value for engineers, architects, and project owners globally.