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 * = 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 MPa, as well as , , , , 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 , American Standard ASTM A416, British standard BS and the Japanese standard JIS G, the Australian standard AS / NZS , Brazilian standard NBR-[2]
References
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Contact us to discuss your requirements of PC Strand Bonded. Our experienced sales team can help you identify the options that best suit your needs.
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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:
- 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.
- We offer PC Strand which confirm to the technical standards such as GB/T , GB/T , ASTM A-416, BS , JIS G or the standards agreed by both of the customers and us.
- 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
- 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.
- 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
15.70
150
17.80
191
(1×7)C
12.70
+0.4
-0.20
112
890
15.20
165
18.00
223
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 h stress relaxation rate r/% not less than
1×2
5.00
15.4
13.9
3.5
60
70
80
1.0
2.5
4.5
16.9
15.2
18.3
16.5
19.2
17.3
5.80
20.7
18.6
22.7
20.4
24.6
22.1
25.9
23.3
8.00
36.9
33.2
39.4
35.5
43.2
38.9
46.7
42.0
49.2
44.3
10.0
57.8
52.0
61.7
55.5
67.6
60.8
73.1
65.8
77.0
69.3
12.00
83.1
74.8
88.7
79.8
97.2
87.5
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 h stress relaxation rate r/% not less than
1×3
6.20
31.1
28.0
3.5
60
70
80
1.0
2.5
4.5
34.1
30.7
36.8
33.1
38.8
34.9
6.50
33.3
30.0
36.5
32.9
39.4
35.5
41.6
37.4
8.60
55.4
49.9
59.2
53.3
64.8
58.3
70.1
63.1
73.9
66.5
8.74
60.6
54.5
64.5
58.1
71.8
64.6
10.80
86.6
77.9
92.5
83.3
101
90.9
110
99.0
115
104
12.90
125
113
133
120
146
131
158
142
166
149
8.74
60.6
54.5
64.5
58.1
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 h stress relaxation rate r/% not less than
1×7
9.50
94.3
84.9
3.5
60
70
80
1.0
2.5
4.5
102
91.8
107
96.3
11.10
128
115
138
124
145
131
12.70
170
153
184
166
193
174
15.20
206
185
220
198
234
211
241
217
260
234
274
247
15.70
266
239
279
251
17.80
327
294
353
318
(1×7)C
12.70
208
187
15.20
300
270
18.00
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: N/mm2
- Steel Area: 165mm2
- Breaking load: 300kN
- 0.1% Proof Load: 264 kN
- Relaxation after h
- 70% break load: 2.5%
- 80% break load: 4.5%
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