PC Strand, or prestressed concrete steel strand, is a twisted steel cable composed of 2, 3, 7 or 19 high strength steel wires and is stress-relieved (stabilized) for prestressed concrete or similar purposes.
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Classification
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PC strand is classified according to the number of steel wires in a strand: 2 wire strand, 3 wire strand, 7 wire steel strand[1] and 19 wire steel strand. It can be classified according to the surface morphology and can be divided into: smooth steel strand, scoring strand, mold pulling strand (compact), coated epoxy resin steel strand. They can also be classified by diameter, or intensity level, or standard.
Specifications
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In the description and list of the table we often see, there are 15-7Φ5, 12-7Φ5, 9-7Φ5 and other specifications of the prestressed steel strand. To 15-7Φ5, for example, 5 said a single diameter 5.0mm of steel, 7Φ5 said seven of the steel wire to form a strand, and 15 that the diameter of each strand of 15mm, the total meaning is "one The beam consists of 7 strands of diameter 15 mm (each having a total diameter of about 15.24 mm, a dimensional deviation +0.40 -0.20; a diameter of about 5.0 mm per filament). The general sectional area is calculated according to 140mm ^ 2. The theoretical breaking value is 140 * 1860 = 260.4 kN, which can withstand the tension of 156.24-169.26 kN according to the prestressing standard of 60% -65%.
Materials
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Using high-carbon steel wire rod, after surface treatment it is cold drawn into steel wire, and then the strand structure will be a number of steel wires stranded into shares. Next the elimination of stress by way of a stabilization process. In order to extend durability, the wire can have metal or non-metallic coatings, such as galvanized, or epoxy resin coating. In order to increase the bond strength with the concrete, the surface can have nicks and so on. The prestressed strands of the mold are twisted to form a mold compression process, the structure is more compact, and the surface layer is more suitable for anchoring. Production of unbonded prestressed steel strand (unbonded steel strand) using ordinary prestressed steel wire, coated with oil or paraffin after the packaging into high-density polyethylene (HDPE) bags.
Features
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The main characteristic of the prestressed steel strand is high strength and relaxation performance is good, the other when the more straight. Common tensile strength levels of 1860 MPa, as well as 1720, 1770, 1960, 2000, 2100 MPa and the like intensity levels. The yield strength of this steel is also higher.
Application
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In most of the post-tensioned and pre-tensioned prestressed project, smooth steel strand is the most widely used prestressed steel. Stranded strand is mainly used to enhance the project, but also for nuclear power and the like works. Galvanized steel strand commonly used in the bridge of the tie rod, cable and external prestressing works. Epoxy coated steel stranded wire is similar to galvanized prestressed steel wire.
Standards
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Countries have standards for prestressed strand, such as: China Standard GB / T 5224, American Standard ASTM A416, British standard BS 5896 and the Japanese standard JIS G3536, the Australian standard AS / NZS 4672, Brazilian standard NBR-7483[2]
References
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PC strand, also known as prestressed concrete strand, is a type of steel reinforcement used in construction. It is made by taking high-tensile steel wire and subjecting it to a process known as prestressing.
During the prestressing process, the steel wire is stretched to a specific tension and then anchored in place. This creates a compressive force within the concrete that counteracts any tensile forces that may occur during the life of the structure. As a result, PC strand is able to provide a higher level of strength and stability to concrete structures than traditional reinforcing methods.
PC strand is typically made from high-carbon steel and is available in a variety of sizes and grades to suit different construction needs. The wire is made by drawing it through a series of dies to achieve the desired size and shape.
PC strand is used in a variety of construction projects, including bridges, buildings, and other infrastructure projects. It is used to reinforce concrete in pre-tensioned and post-tensioned applications. It is also used in the construction of parking garages, stadiums, and other large structures. It can also be used in the repair and retrofitting of existing structures. One of the most common uses of PC strand is in pre-tensioned concrete. This method of prestressing involves stretching the PC strand before the concrete is poured, and then anchoring the strand in place. The concrete is then poured around the strand, creating a compressive force that counteracts any tensile forces that may occur during the life of the structure.
In addition to its strength and stability benefits, PC strand also offers other advantages over traditional reinforcing methods. For example, it requires less steel overall, which can reduce the overall weight of the structure and decrease the amount of steel needed to be produced. This can also help to reduce the overall cost of the project.
Another advantage of PC strand is that it can be easily cut and bent to fit into tight spaces, making it an ideal solution for structures with complex or irregular shapes. Additionally, its smooth surface can help to reduce the risk of concrete cracking and improve the durability of the structure.
PC strand is made in many countries worldwide, with the United States being the largest producer. In the US, Madison Steel is one of the leading distributors of PC strand. They offer a wide range of products for different applications such as bridges, buildings, and other infrastructure projects.
Overall, PC strand is a versatile and reliable reinforcement option for concrete structures. Its ability to provide a high level of strength and stability makes it an ideal choice for a wide range of construction projects. With the help of logistic professionals like Madison Steel, Prestressed strand is widely available and can be easily incorporated into any construction project. Call 404-343-4855, email us at [email protected] or visit us online at madisonsteel.com/customize-my-solution/ for a quote.
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