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Unbonded PC Strand
The Unbonded PC Strand, also known as Unbonded Steel Strand, is widely used in Unbonded Prestressed Concrete applications such as cast-in-place slabs, foundation piles, slope supports, and geotechnical projects.
This strand is ideal for recoverable anchor cables, significantly lowering engineering costs.
The Unbonded PC Strand is widely used in Unbonded Prestressed Concrete applications, offering high strength, durability, and cost efficiency. Its use in recoverable anchor cables significantly reduces engineering project costs.
All specifications comply with JG 161-2004, ensuring superior quality and reliability. The steel material meets GB/T5224-2014, EN10138/BS5896, or ASTM A416 standards, or can be customized according to client requirements.
The sheathing conforms to GB 11116 and GB/T9341, while the grease adheres to JG3007-1993, ensuring long-term corrosion resistance and performance stability.
The Unbonded Steel Strand is primarily applied in Unbonded Prestressed Concrete structures and recoverable anchor cable systems, helping minimize construction costs while maintaining structural integrity and efficiency.
YXXK-UPS Series Unbonded PC Strand (Ref. JG161-2004, Single-layer HDPE Sheathing)
| CODE | Steel | Grease | Sheathing thickness | μ | κ | ||
| W3 (g/m) | (mm) | ||||||
| Diameter (mm) | Section Area (mm2) | Tensile Strength (MPa) | (no less than) | (no less than) | |||
| YXXK-UPS9 | 9. 53 | 54. 84 | 1860 | 32 | 0. 8 | 0.04~ 0.1 | 0.003 ~ 0.004 |
| YXXK-UPS13 | 12. 7 | 98. 71 | 1860 | 43 | 1 | 0.04 ~ 0.1 | 0.003 ~ 0.004 |
| YXXK-UPS13 | 12. 9 | 100 | 1860 | 45 | 1 | 0.04 ~ 0.1 | 0.003 ~ 0.004 |
| YXXK-UPS15 | 15. 24 | 140 | 1860 | 50 | 1 | 0.04 ~ 0.1 | 0.003 ~ 0.004 |
| YXXK-UPS15 | 15. 7 | 150 | 1860 | 53 | 1 | 0.04 ~ 0.1 | 0.003 ~ 0.004 |
μ- Friction coefficient between steel strands and inner wall of sheath in unbonded prestressing tendon
κ - Friction coefficient considering local deviation per meter length of unbonded prestressing tendon
Why Choose This Unbonded Prestressed Steel Strand?
Steel Features:
Made from high-tensile-strength steel strands that meet international standards, with a T/S grade exceeding 1920 MPa.
Exceptional straightness, with bow height less than 2mm per meter.
Manufactured using only new steel; rusted or recycled steel is strictly prohibited.
Surface is free from dust, granules, oil, or corrosive substances.
Grease Features:
Coated with high-quality anti-corrosion grease specifically for unbonded PC strand applications.
Chemically stable, non-corrosive to surrounding materials.
Effectively blocks water, moisture, and corrosion.
Provides excellent lubrication to reduce friction resistance.
Stable across temperature ranges—won’t flow at high temperatures or become brittle in the cold.
This unbonded steel strand is ideal for ensuring the longevity and reliability of unbonded prestressed concrete structures, combining superior steel quality with advanced protective grease.
| Test Item | Test Ways | Requirement | |
| Work cone penetration | 25℃， 0.1mm | GB/T269 | 265-295 |
| Corrosion | 45# steel, 100℃,24hours | SH/T0331 | - |
| Drop point | ℃, no less than | GB/T4929 | 160 |
| Moisture | %, no more than | GB/T512 | 0.1 |
| Stencil oil | %,(100℃,24hours),no more than | SH/T0324 | 8 |
| Evaporation losses | %,(99℃,24hours),no more than | GB/T7325 | 2 |
| Low temperature performance | -40℃,30 minuts | SH0387 | - |
| Humid heat test | grade,(45#steel30D),no more than | GB/T2361 | 2 |
| Sailt spray analysis | grade,(45#steel30D),no more than | SH/T0081 | 2 |
| Oxidation Stability | 99℃,100hours,785kpa, pressure no more than | SH/T0325 | 147 |
| Oxidation Stability | acide value after oxidation mgKOH/g, no more than | GB/T264 | 1 |
| PH Value | - | PH test paper | 7. 0-8. 0 |
| Compatibility casing oil absorption | %,(65℃,40D),no more than | HG2-146 | 10 |
| Tensile strength change rate to casing compatibility | %,(65℃,40D),no more than | GB1040 | 30 |
HDPE Part:
| Properties | Test Ways | Requirements |
| Large and small grains, g/kg | SH/T 1541.1-2019 | ≤5 |
| Black grain, piece/kg | SH/T 1541.1-2019 | 0 |
| Color grains, piece/kg | SH/T 1541.1-2019 | ≤5 |
| Snake skin grains, piece/kg | SH/T 1541.1-2019 | ≤10 |
| Density (23℃), g/cm3 | GB/T1033.2 or ASTM D1505 | 0.9510+-0.0020 |
| Environmental Stress Crack Resistance | Condition A, F50,100% lgepal CO-630,ASTM D1693 | ≥30 hours |
| Condition B, F50:35; Bottles ESCR:250, 60℃, F50 | ||
| Melt Flow | Condition 190/2.16, ASTM D1238 | ≤0.35 g/10min |
| GB/T 3682. 1 | 1.0+-0.2 | |
| Tensile Strength | 2 in per min, ASTM D638 Type IV | ≥28MPA |
| Elongation at break | 2 in per min, ASTM D638 Type IV | ≥600% |
| Flexural Modulus | ASTM D790 | 1. 378Gpa |
| Brittleness Temperature | ASTM D746 | Max -118℃ |
Why Choose Our Unbonded Prestressed Concrete Steel Strand?
Our unbonded PC strand stands out in quality and performance compared to other factories’ unbonded prestressed concrete strands. Key advantages include:
Superior Appearance: Smooth, consistent surface with uniform thickness.
Excellent Friction Properties: The friction coefficient between the unbonded steel strand and the inner wall of the sheath is outstanding, ensuring optimal prestressing performance.
Minimal Local Deviation: Even considering local deviations per meter length, our unbonded prestressed concrete strands maintain a very low friction coefficient.
Other Manufacturers’ Products:
The surface often contains granulated impurities and is uneven.
The coating may leak grease.
Friction performance (μ and κ) is inconsistent and subpar.
Choose our unbonded PC strand for reliability, precision, and superior prestressing results.
Q: What is an Unbonded PC Strand?
A: An unbonded PC strand is a type of prestressed steel strand used in concrete construction. Unlike bonded strands, it is coated with grease and sheathed, allowing it to move freely within the concrete while maintaining tension.
Q: How does Unbonded Prestressed Concrete improve construction?
A: Using unbonded prestressed concrete helps control cracking, improves load distribution, and enhances durability. The unbonded steel strand enables better stress transfer and provides long-lasting structural performance.
Q: What makes your Unbonded Steel Strand better than others?
A: Our unbonded steel strand has a smooth, uniform surface with minimal impurities. The friction coefficient between the strand and sheath is excellent, ensuring superior prestressing efficiency compared to other factories’ products.
Q: Where is Unbonded PC Strand typically used?
A: It is commonly used in bridges, high-rise buildings, and industrial structures where unbonded prestressed concrete is needed to achieve high strength, flexibility, and crack control.
Q: How should I handle and store Unbonded Prestressed Concrete strands?
A: Store the unbonded steel strand in a dry, covered area to prevent moisture or dust contamination. Avoid bending sharply to maintain strand integrity and ensure optimal performance during installation.
