Prestressed Material

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The prestressing steel strand used in prestressing is typically made of high-strength, low-relaxation steel. It is commonly known as prestressing strand or prestressing wire. The prestressing steel strand is composed of multiple individual steel wires twisted together to form a helical shape. The wires are usually made of high-carbon steel with a diameter ranging from 5 to 15 millimeters.

The steel used for prestressing strand has high tensile strength, typically in the range of 1,860 to 2,200 megapascals (MPa). This high strength allows the strand to withstand the forces applied during prestressing without breaking.

To enhance the durability and performance of the strand, it is often coated with a protective layer of zinc or epoxy. This coating helps prevent corrosion and improves the bond between the strand and the surrounding concrete.

Prestressing strand for prestressed concrete is commonly used in various construction applications, such as precast concrete elements, bridges, high-rise buildings, and other structures that require enhanced load-bearing capacity and reduced deflection.

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Reinforcing Steel PC Strand for Concrete Prestressing Types

There are several types of prestressing steel strands used in construction, each designed to meet specific project requirements. Here are some common types:

1. Uncoated Prestressing Strand: This type of strand consists of multiple steel wires twisted together without any protective coating. Uncoated strands are primarily used in applications where corrosion protection is not a concern, such as temporary structures or indoor applications.

2. Galvanized Prestressing Strand: Galvanized steel strands have a zinc coating applied to the surface of the steel wires. The zinc coating provides corrosion resistance, protecting the strand from environmental elements. Galvanized steel strands are commonly used in situations where the structure may be exposed to moisture or corrosive conditions.

3. Epoxy-Coated Prestressing Strand: Epoxy-coated steel strands are coated with a layer of epoxy resin to provide corrosion protection. The epoxy coating creates a barrier between the steel and the surrounding environment, preventing the ingress of moisture and corrosive agents. This type of strand is widely used in structures where long-term durability is essential.

4. Stainless Steel Prestressing Strand: Stainless steel strands offer excellent corrosion resistance due to their high chromium content. They are particularly suitable for applications where the structure will be exposed to aggressive environments, such as marine environments or chemical plants.

5. Low Relaxation Prestressing Strand: Low relaxation strands are manufactured using a specialized process that minimizes the amount of relaxation or elongation that occurs over time. This type of strand is used when precise control of prestress losses is crucial. Low relaxation strands help maintain the desired level of prestress in the structure over an extended period.

Why Do You Need the PC Strands?

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What are the PC strands?

Prestressed concrete strands are composed of multiple roots of high-strength steel wire. It is twisted wire rope. By eliminating stress(stabilizing treatment), the strands are suitable for prestressed concrete or similar purposes. It can help with saving material consumption. PC strands are standard in concrete constructing as low leisure and excessive strength combined steel wire models for concrete reinforcing The multi-wire structure permits incredible energy in concrete pre-stressing.

PC strand features excessive tensile strength, high corrosion resistance, water resistance, better efficiency at elevated temperature, and many others. Pre pressured concrete strands and wires’ range of galvanized, pre pressured strands and wires reinforce prefab constructions and precast parts.

Features of the PC strands

1. High tensile strength, low relaxation, stable modulus of elasticity, stress-relieved, straight, firm connection with concrete.

2. Unbonded and bonded prestressed steel strands have good corrosion resistance and small friction of unbonded tendons, which can be easily bent into curved shapes.

3. It is suitable for cast-in-place concrete of special structures such as long-span and wide buildings and heavy-duty precast beams.

4.No grouting hole, grouting, easy to use, material saving, easy to bend, and so on.

Application of the PC strands

Composed of multiple roots of high-strength steel wire. It has the characteristic of eliminating stress (stabilizing treatment), suitable for prestressed concrete or similar purposes, saving steel consumption, high tensile strength, elongation, low relaxation, and stress losses small. The PC Strands has good performance characteristics such as fatigue, belong to high efficiency in steel products technology content is higher, better product quality. PC steel strand is widely used in highways, Bridges, pillow rail, large sports venues, high-rise buildings, airports, ports, docks, nuclear power plants, DAMS, urban overhead road and light rail, and other infrastructure areas.

Precautions In The Application Of Prestressed Concrete Steel Strands

The prestressed concrete steel strand is made of a high-carbon steel wire rod, which is cold drawn into steel wire after surface treatment, and then a certain number of steel wires are twisted into strands according to the steel strand structure, and then they are formed through a stress-relieving stabilization process. If you want to ensure the structure and performance of the prestressed concrete steel strands, you must pay attention to the following matters during the application process.

1. It is strictly forbidden to use any heating deformation measures in the use of prestressed steel strands, so as not to reduce the mechanical properties of the prestressed steel strands.

2. Welding is strictly prohibited in the use of prestressed concrete steel strands, because the strength of the solder joints is much lower than that of the steel strands, and it is easy to cause wire breakage at the solder joints during tension.

3. The cutting of prestressed steel should use gearless (grinding wheel card). Electric and gas welding cutting is easy to damages the appearance of the steel. At the same time, local heating of the end is caused, which makes the performance drop significantly.

4. When the prestressed steel wire adopts cyclic reinforcement, its bending radius shall not be less than 3 times the diameter of the steel wire.

5. The steel strands that are packaged in rolls without shafts should be tapped from the inner ring and laid out in a vertical position.

6. The twist direction of the prestressed concrete steel strand is usually left twist. When using the right twist, it should be noted in time, otherwise, the direct use will affect the coordination with the anchor.

7. The quality of the prestressed steel strand heading is not directly related to the quality of the steel strand itself, but too high strength will not be conducive to the quality of the steel strand heading. Therefore, when you choose the heading anchor, you should Explain to the manufacturer in the order.

8. The prestressed steel strand itself does not have the performance of anti-corrosion and anti-rust, so when storing it, it should be placed in a relatively dry room, preferably not in direct contact with the ground. If it is placed outdoors, a rain- and moisture-proof cloth should be built on the ground.

In addition, the prestressed steel strand should be used up in a short time. If it is to be used in a special environment, rust-proof packaging should be used in the order. Floating rust on the appearance of prestressed steel does not affect its use, but severe corrosion will affect its mechanical properties.

9. Hoisting of prestressed steel strands: The hoisting of prestressed steel should be hoisted in order, orderly, and with gaps. Unbonded prestressed tendons should be hoisted in parallel with three brown rope grommets, and it is strictly forbidden to hoist them directly with steel wire ropes. Coiled steel strands should be used with forklifts or special lifting tools to prevent the steel belt from breaking and causing loose bales.

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