Construction projects have seen tremendous advancements in technology, which have paved the way for innovative solutions to improve structural integrity and safety. One of those solutions is prestressed concrete strand (PC strand).

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In this blog post, we will delve into the wide range of applications of prestressed concrete strand in construction projects. Explore how DWR’s high-quality steel solutions contribute to the strength, durability, and versatility of prestressed concrete, revolutionizing the way we build structures.

Applications of PC Strand

There is a wide variety of PC strand applications. From bridge girders to piles and pipes, the versatility of prestressed concrete strand makes it a great solution for many different projects.

Let us describe some of them in detail.

Bridge Girders

PC strand is used in bridge girders to provide compressive stress, which in turn helps to offset the tensile stress that the concrete experiences when placed under load. 

In general, this pre-tensioning process improves the load-carrying capacity of the bridge girder and enhances its ability to flex and deflect under various load conditions. This way, longer spans are possible, and less support structures are needed to achieve a more cost-effective and aesthetically pleasing bridge design.

High-Rise Buildings and Parking Garages

PC strand is also used in the construction of high-rise buildings due to its high strength and durability. It helps in reducing the size of columns and beams resulting in less use of concrete and reinforcement steel.

Ground Anchors

In a ground anchor system, PC strand is typically used in a process called post-tensioning. This process works by applying a compressive stress to the PC strand before it is placed into the ground. Once in position, the compressive stress is released, creating a tensile force within the PC strand. This tension is then transferred to the soil or rock, providing stability to the structure above.

Benefits and Advantages of PC Strand

There are many benefits and advantages in using PC strand in construction projects.

For example, the project manager can benefit from reduced material usage and construction timelines that make the whole process more efficient. This is achieved thanks to the excellent straightness of the PC strand which makes it easy to use and handle at the time it offers less building cost and time.

Also, the versatility of PC strand offers greater design flexibility and architectural freedom.

Now, for the structure itself, this material also offers a series of benefits. Here are some of the most relevant.

Increased structural strength and durability

The PC strand is designed to cope with the stresses of compression, tension and torsion that are encountered by concrete structures during their lifetime.

By pre-tensioning the strands before the concrete is poured, the steel is able to counteract the forces that are placed upon it.

As a result, the concrete is able to handle greater loads without experiencing structural damage.

Enhanced resistance to seismic activities and extreme weather conditions

Prestressing the concrete strand reduces the potential for cracking and failure during seismic activities, which can be caused by earthquakes, soil liquefaction, and ground shaking.

The compressive forces applied to the PC strand during construction significantly improve the concrete’s ability to resist bending and tension stresses, which are known to be the primary causes of seismic damage. 

Add the fact that our PC strand meets standards such as the ASTM A-416 after completing and approving ASTM A1061 1000-hour relaxation testing, and you have enhanced stability to concrete structures and consistent elasticity thanks to a consistent modulus of elasticity up to 80% of the strand’s ultimate strength.

Moreover, PC strands are known to have enhanced resistance to extreme weather conditions, such as hurricanes, tornadoes, and floods. The concrete’s enhanced durability and strength ensure that the structure can withstand these intense weather events virtually without suffering damage.

Minimized maintenance requirements

Generally, the pre-tensioning of the steel cables eliminates any potential for cracking, which typically occurs in traditional reinforced concrete structures. As a result, the structural integrity of the concrete is maintained over an extended period, which reduces the need for frequent repairs and maintenance while making life cycle costs lower.

Final words

PC strand has become an essential component in construction projects due to its durability, strength, and flexibility benefits. As you can see, for any construction project that requires excellent structural integrity and safety, prestressed concrete strand is the go-to solution.

At DWR®, we are committed to providing you with any additional information you require. We have a technical staff with extensive experience in concrete reinforcement solutions design and application that understands the benefits you expect.

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We are one of the leading manufacturers of PC strand. Our PC Wire & PC Strand equipment and technical know-how is among the finest in the industry. Our PC strand production process has strict quality. And our PC strand has the advantages of higher fatigue, corrosion resistance and better performance at elevated temperature.

Common sizes: 9.3 mm. 9.6.12.7, 12.5, 12.9, 11.11, 11.3, 15.24 and 15.7 mm.

Raw Materials: High-carbon steel wire rods, SWRH 82B

Processing: Continuous drawing by means of big reduction of area, twist, stabilizing treatment

Features:

1. High tensile strength, low relaxation, stable modulus of elasticity, stress-relieved, firm connection with concrete, low stress, stable construction, good combination with steel reinforced concrete; saving material, reducing distortion and construction weight, increasing the abrasion resistance, water resistance, stiffness.
2. We offer PC Strand which confirm to the technical standards such as GB/T 5223, GB/T 5224, ASTM A-416, BS 5896, JIS G3536 or the standards agreed by both of the customers and us.
3. PC strand can also be supplied in various forms for pre- or post-tensioning applications, with plain or galvanized material ranging from 3 wires, 7 wires, 19 wire and compacted construction.

Inquiry please provide: Standard, Diameter, Mechanical property (especially tensile strength), coil weight, Packing dimension, Quantity.

Packing: Export anti-rust packing with vapors corrosion inhibiting technology and 3 coatings. There are two wooden pallets on the bottom.

Application

1. Our PC strand is mainly used for the reinforcement of prestressed concrete structures, such as large-span railway and road bridges, major bridges, silos, buildings, dams, floor slabs, foundations, large concrete vessels, atomic reactor buildings, stadiums, airport hangers, pre-cast segments, crane beams, anchorages and multi-storey industrial buildings etc.
2. Our PC strand is also used for the construction of highways, poles and water towers in civil construction, and energy source sea transportation, house buildings, water control projects, and rock and earth anchoring components to increase the tensile force.

1 × 7 strand PC steel wire

1 × 7 strand PC steel wire drawing

1 × 3 strand PC steel wire

1 × 3 strand PC steel wire drawing

PC steel wire in woven bag package.

1×2 Structure strand size and tolerance, reference quality per meter Strand Structure Nominal Diameter Strand Diameter Tolerance /mm Strand reference sectional area Sn/mm2 Strand reference quality per meter/(g/m) Strand Diameter Dn/mm Wire Diameter d/mm 1×2 5.00 2.50 +0.15
-0.05 9.82 77.1 5.80 2.90 13.2 104 8.00 4.00 +0.25
-0.10 25.1 197 10.00 5.00 39.3 309 12.00 6.00 56.5 444 1×3 Structure strand size and tolerance, reference quality per meter Strand Structure Nominal Diameter Strand Measurement A/mm Measurement A Tolerance /mm Strand reference sectional area Sn/mm2 Strand reference quality per meter/(g/m) Strand Diameter Dn/mm Wire Diameter d/mm 1×3 6.20 2.90 5.41 +0.15
-0.05 19.8 155 6.50 3.00 5.60 21.2 166 8.60 4.00 7.46 +0.20
-0.10 37.7 296 8.74 4.05 7.56 38.6 303 10.80 5.00 9.33 58.9 462 1×3 I  12.90 6.00 11.20 84.8 666 8.74 4.05 7.56 38.6 303 1×7 Structure strand size and tolerance, reference quality per meter Strand Structure Nominal Diameter Dn/mm Diameter Tolerance /mm Strand reference sectional area Sn/mm2 Strand reference quality per meter/(g/m) Center wire diameter (do) enlarged range/% not less than 1×7 9.50 +0.30
-0.15 54.8 430 2.5 11.10 74.2 582 12.70 +0.40
-0.20 98.7 775 15.20 140 1101 15.70 150 1178 17.80 191 1500 (1×7)C 12.70 +0.4
-0.20 112 890 15.20 165 1295 18.00 223 1750 1×2 Mechanical properties of structural steel strand trand Structure Strand nominal diameter Dn/mm Abstract tensile strength Rm/Mpa not less than The largest force of the whole strand Fm/kN not less than Rated non-proportional extension force Total extension ratio at the largest force (Lo≥400)Agt/% not less than Stress Relaxation Initial load equivalent to the percentage of the nominal largest force/% After 1000h stress relaxation rate r/% not less than 1×2 5.00 1570 15.4 13.9 3.5 60
70
80 1.0
2.5
4.5 1720 16.9 15.2 1860 18.3 16.5 1960 19.2 17.3 5.80 1570 20.7 18.6 1720 22.7 20.4 1860 24.6 22.1 1960 25.9 23.3 8.00 1470 36.9 33.2 1570 39.4 35.5 1720 43.2 38.9 1860 46.7 42.0 1960 49.2 44.3 10.0 1470 57.8 52.0 1570 61.7 55.5 1720 67.6 60.8 1860 73.1 65.8 1960 77.0 69.3 12.00 1470 83.1 74.8 1570 88.7 79.8 1720 97.2 87.5 1860 105 94.5 Note: Rated non-proportional extension force Fp0.2 is not less than 90% of the largest force of the whole strand 1×3 Mechanical properties of structural steel strand Strand Structure Strand nominal diameter Dn/mm Abstract tensile strength Rm/Mpa not less than The largest force of the whole strand Fm/kN not less than Rated non-proportional extension force Total extension ratio at the largest force (Lo≥400)Agt/% not less than Stress Relaxation Initial load equivalent to the percentage of the nominal largest force/% After 1000h stress relaxation rate r/% not less than 1×3 6.20 1570 31.1 28.0 3.5 60
70
80 1.0
2.5
4.5 1720 34.1 30.7 1860 36.8 33.1 1960 38.8 34.9 6.50 1570 33.3 30.0 1720 36.5 32.9 1860 39.4 35.5 1960 41.6 37.4 8.60 1470 55.4 49.9 1570 59.2 53.3 1720 64.8 58.3 1860 70.1 63.1 1960 73.9 66.5 8.74 1570 60.6 54.5 1670 64.5 58.1 1860 71.8 64.6 10.80 1470 86.6 77.9 1570 92.5 83.3 1720 101 90.9 1860 110 99.0 1960 115 104 12.90 1470 125 113 1570 133 120 1720 146 131 1860 158 142 1960 166 149 8.74 1570 60.6 54.5 1670 64.5 58.1 1860 71.8 64.6 Note: Rated non-proportional extension force Fp0.2 is not less than 90% of the largest force of the whole strand 1×7 Mechanical properties of structural steel strand Strand Structure Strand nominal diameter Dn/mm Abstract tensile strength Rm/Mpa not less than The largest force of the whole strand Fm/KN not less than Rated non-proportional extension force Total extension ratio at the largest force (Lo≥400)Agt/% not less than Stress Relaxation Initial load equivalent to the percentage of the nominal largest force/% After 1000h stress relaxation rate r/% not less than 1×7 9.50 1720 94.3 84.9 3.5 60
70
80 1.0
2.5
4.5 1860 102 91.8 1960 107 96.3 11.10 1720 128 115 1860 138 124 1960 145 131 12.70 1720 170 153 1860 184 166 1960 193 174 15.20 1470 206 185 1570 220 198 1670 234 211 1720 241 217 1860 260 234 1960 274 247 15.70 1770 266 239 1860 279 251 17.80 1720 327 294 1860 353 318 (1×7)C 12.70 1860 208 187 15.20 1820 300 270 18.00 1720 384 346 Note: Rated non-proportional extension force Fp0.2 is not less than 90% of the largest force of the whole strand

Compacted PC Strand produced acc. to ASTM A779 (12)

• Diameter: 15.2mm
• Tensile Strength: 1820 N/mm2
• Steel Area: 165mm2
• Breaking load: 300kN
• 0.1% Proof Load: 264 kN
• Relaxation after 1000h
• 70% break load: 2.5%
• 80% break load: 4.5%

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