PC strands, or prestressed concrete strands, are high-strength steel wires made up of individual steel wires twisted together in a helical pattern. They are specifically designed to withstand high tensile forces.
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By introducing prestress to concrete, PC steel wire strands help to counteract the tensile forces that it may be exposed to, this can increase the load-carrying capacity. PC strand is widely used with concrete structures such as beams and columns.
Prestressed strands can increase the strength of concrete structures and are often used for large scale projects. Prestressed steel strand construction can vary in diameter, length, and finish.
Many construction projects can benefit from prestressed strand and consider it essential in their structure, including:
PC strand is a reliable way of adding bond strength to any concrete structure.
Our uncoated seven-wire PC Strand is manufactured under the highest quality standards. It is used in pretensioned and post-tensioned prestressed concrete constructions.
Construction: 1×7 270 ksi Low-Relaxation
Diameter: 0.50” (0.60” also available as MTO)
Min Elongation: 3.5%
Coil Length: 270 kft
If you are looking for more details, kindly visit Prestressed Steel Strand.
Finish: Uncoated or Galvanized
-Hour Relaxation Testing: Successful Completion & Approval of ASTM A
Meets: ASTM A416
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.
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.
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 * = 260.4 kN, which can withstand the tension of 156.24-169.26 kN according to the prestressing standard of 60% -65%.
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.
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 MPa, as well as , , , , MPa and the like intensity levels. The yield strength of this steel is also higher.
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.
Countries have standards for prestressed strand, such as: China Standard GB / T , American Standard ASTM A416, British standard BS and the Japanese standard JIS G, the Australian standard AS / NZS , Brazilian standard NBR-[2]
For more information, please visit astm a416/a416m.