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Description of Prestressing Post-Tensioned PC Strand
Tensioning stranded wire is a steel product composed of multiple steel wires. The surface of carbon steel can be added with galvanized layer, zinc-aluminum alloy layer, aluminum-clad layer, copper-plated layer, and epoxy resin coating.
Galvanized steel strand is usually used for load-bearing cable, stay wire, reinforcing core, etc. It can also be used as the ground wire of overhead power transmission to block the cables on both sides of the road or the structural cables in the building structure. The commonly used prestressed steel strands are uncoated low relaxation prestressed steel strands, and some are galvanized.
Technical Parameter of Prestressing Post-Tensioned PC Strand
| Dia(mm) | Tensile Strength(Rm/MPa) | Max strength for hole wire(Fm/kN) | StipulatedNominal Non proportional extension rate(Fp0.2/kN) | Cross section size(mm2) | Approximate weight(g/m) | Tolerance(mm) |
| 12.7 | ≥1860 | ≥185.1 | ≥166 | 98.7 | 775 | +0.4~-0.2 |
| 15.2 | ≥1860 | ≥262.5 | ≥235 | 150 | 1178 | +0.4~-0.2 |
| 12.8 | ≥1860 | ≥358 | ≥318 | 191 | 1500 | +0.4~-0.2 |
Advantages of Post-Tensioned PC Strands
Stranded steel cable composed of multiple high-strength steel wires and treated with stress relief (stabilization treatment), suitable for prestressed concrete or similar applications, with saving steel, high tensile strength, good elongation, low relaxation, stress With the characteristics of small loss and excellent fatigue resistance, it is a product with high technical content and good quality among high-efficiency steel products. PC steel strands are widely used in highways, bridges, sleepers, large stadiums, high-rise buildings, airports, ports, wharves, nuclear power plants, dams, urban elevated and light rail, and other infrastructure construction fields.
Application of High Tension Strands Steel Wire Galvanized
1) Used in the upper plates of bridges
2) As cable for special bridges and for the maintenance of bridges
3) In construction, this product is used in concrete pillars and
supports for the construction of buildings, domes for nuclear
power plants and reinforcement of LNG concrete tanks.
4) It is also used as floor and roof reinforcement for sports
stadiums.
5) It can be extensively used in construction materials for PC
panels, high-pressure concrete water pipes, marine structures,
towers and runways.
Why choose Galvanized Steel Strand
The surface coating of prestressed steel strands with zinc is a useful method of delaying steel wire corrosion and stress corrosion. When the surface of the prestressed steel strand has the defect of reaching the steel base or there are some corrosion pits, the galvanized steel wire will have a hydrogen embrittlement cracking phenomenon. Because the prestressed steel wire has high strength and low plasticity, it is more susceptible to corrosion than ordinary steel bars. If it is exposed to rain, moisture, or corrosive medium during storage and transportation, the prestressed steel will undergo electrochemical corrosion, causing the surface of the steel wire to form corrosion pits of different sizes and distribution, and the corrosion pit is equivalent to a "gap". During the tension process, the stress strands are unevenly distributed, and the stress is concentrated at the edge of the "notch". When the uniform stress is low, the "notch" edge stress has reached the fracture stress, resulting in early cracking. The "notch" active effect caused by corrosion is related to the arrangement of the steel. When there is a higher carbon content and higher residual stress, the "notch" will be more active to the stress. Because the prestressed steel wire has a small cross-section, high stress and low deformation, it is necessary to guard against corrosion.
