+86 022 2376 3704
+86 022 2376 3704
Sep. 30, 2025
As a supplier with decades of experience in the prestressed concrete industry, we consistently prioritize "high quality and project adaptability," providing customized reinforcement solutions for projects such as bridges, buildings, water conservancy projects, and wind power plants. Epoxy-coated and unbonded steel strands, both commonly used in construction projects, are specialty reinforcements for prestressed concrete. Their key differences lie in their protective structures and bonding properties. The following analyzes the differences between epoxy-coated and unbonded steel strands, focusing on product characteristics and project adaptability. The specific differences are as follows:
I. Basic Commonalities
1. Standard-Compliant Core Material: Both products utilize a 1×7 high-strength steel strand with a mainstream grade of 1860 MPa. Key mechanical properties such as tensile strength, elongation, and low relaxation strictly comply with the GB/T 5224-2023 standard. Every batch of our products undergoes third-party testing before shipment to ensure safe bearing capacity.
2. Unified Functionality: Both products are suitable for post-tensioned prestressed concrete structures. By applying prestress, they significantly improve component crack resistance, stiffness, and long-term load-bearing capacity. They are core load-bearing materials in key locations such as large bridge girders, high-rise building beams and columns, water conservancy dams, and wind turbine towers.
3. Standard Anti-Corrosion Design: To address challenges such as concrete carbonization and chloride ion corrosion (such as those encountered in coastal and saline-alkali land projects), both products feature specialized anti-corrosion treatments, effectively extending the service life of the structure, improving durability, and reducing ongoing maintenance costs.
Ⅱ. Core Differences
| Comparison Dimension | Epoxy-Coated PC Strand | Unbonded PC Strand |
| Structural composition | The surface of the steel strand is coated with 80-120μm epoxy powder coating (without outer sheath), and the coating adhesion meets the test standards. | Steel strand + high stability anti-corrosion grease + 1.0mm thick HDPE sheath (three-layer protection), the sheath is impact-resistant and anti-aging. |
| Relationship with concrete | There is bonding (epoxy coating does not isolate the bond strength), and grouting of the channel is required to form a "steel strand-concrete" synergistic force system. | No bonding (PE sheath isolation), the steel strands can be freely expanded and contracted to meet the needs of structural deformation. |
| Construction technology | It is necessary to reserve holes and bundles, and high-pressure grouting is required after tensioning (we can provide matching grouting agents to improve anti-corrosion sealing). | No need for ducts or grouting, direct laying and tensioning, shortening the construction period by more than 30% compared with traditional processes. |
| Corrosion resistance level | Relying on the dual protection of "epoxy coating + grouting", it is suitable for humid and corrosive environments (such as cross-river bridges and underground pipeline corridors) | Relying on "PE sheath + anti-corrosion grease" for independent protection, it is suitable for tight construction schedules and inconvenient grouting scenarios (such as garage roofs and large-span floor slabs) |
| Applicable projects | Heavy-load structures such as bridge main beams, large beam columns, and water conservancy dams that require high adhesion and long-term corrosion protection. | Projects that require construction efficiency and adaptability to deformation, such as large-span floor slabs, prefabricated buildings, and wind turbine towers. |
| Key Quality Indicators | Epoxy coating adhesion (no peeling in the cross-cut test) and coating continuity (no leaking spots) | PE sheath thickness (≥1.0mm), grease dropping point (≥120℃), sheath impact resistance. |
III. Our Services
1. Customized Supply: We offer products in various diameters (15.2mm, 17.8mm, etc.) and strength grades based on project design requirements. We support both small trial orders and large-volume batch delivery, flexibly aligning with project schedules.
2. One-Stop Support: In addition to steel strands, we also offer supporting products such as national standard anchors and tensioning equipment, eliminating the hassle of coordinating with multiple suppliers and ensuring the compatibility of the entire system.
3. Source Factory Advantage: Direct access to the factory offers competitive pricing and third-party inspection support. We also provide prompt response to any issues, ensuring both cost-effectiveness and quality.
Understanding the differences between the two types of steel strands can help us select the appropriate type of steel strand for different scenarios. If you need assistance, please contact us via the phone or email on our official website. We offer comprehensive after-sales service. If you have specific project parameter requirements or are confused about the product selection, please contact us via the phone or email on our official website. We can also customize a customized solution for you free of charge!
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