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PC Strand

PC Strand

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PC 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.
 

 ASTM A 416:
Grade Normal Diameter(mm) Tolerance(mm)  Area of section(mm2)   Theoretical Weight per 1000 metre  Minimum breaking strength(KN) Minimum load at percent extension(KN) Elongation(%) Relaxation after 1000hrs at
Initial load 70%  Initial load 80%
250  9.53  +/-0.40  51.61  405  89.0  80.1     3.5  2.5    3.5 
 11.11     69.68  548  120.1  108.1
 12.70    92.90  730  160.1  144.1
 15.24   139.35  1094  240.2  216.2
270  9.53  +0.65  54.84  432  102.3  92.1     3.5      2.5       3.5
 11.11   -0.15  74.19  582  137.9  124.1
 12.70   98.71  775   183.7  165.3
 15.24   140  1102  260.7  234.6

 

 BS5896
Strand type Normal Dia.MM Tensile strength(Mpa) Specified breaking load(KN) Load at 1% elongation(KN) Minimum elongation at max load 1% Relaxation Value 1000h
Initial  load 60% Initial load 70% Initial load 80%
7-wire standard 9.3 1770 92 81 3.5 1 2.5 4.5
11 1770 125 110
12.5 1770 164 144
15.2 1670 232 204
7-wire super 9.6 1860 102 90 3.5 1 2.5 4.5
11.3 1860 139 122
12.9 1860 186 163
15.7 1770 265 233
7-wire drawn 12.7 1860 209 184 3.5 1 2.5 4.5
15.2 1820 300 255
18 1700 380 323

 

JISG 3536
Strand Type  Nominal Diameter(mm) Diameter Tolerance(mm) Nominal Area(mm2)  Nominal Weight (KG/1000m) Breaking Strength(KN min.)  Yield Strength(KN min.) Elongation at Max Load Min. Relaxation
Initial Load Of Min Nominal Breaking Strength 1000h Value No More Than
15-7AN 9.3 0.4 51.61 405 88.8 75.5 3.50% 70% 2.50%
10.8 -0.2 69.68 546 120 102
15-7AL 12.4   92.9 729 160 136
15.2   138.7 1101 240 204
15-7BN 9.5   54.84 432 102 86.8
11.1   74.19 580 128 118
15-7BL 12.7   98.71 774 183 156
15.2   138.7 1101 261 222
15-19W 15-19L  17.8 0.6 208.4 1652 387 330
21.8 -0.25 312.9 2482 573 495
28.6   532.4 4229 949 807

 

 AS/NZS4672
Strand type Normal  Dia.(mm) Tensile strength(Mpa) Nominal cross-sectional area(mm2) Minimum Elongation at max load -1% Elongation(Min.)% Relaxation Value 1000h
Nominal(g/m) Permissible variation(g/m) Low relaxation Normal relaxation
70% 80% 70% 80%
7 wire ordinary 9.5 1850 55 432 423.4-449.3 3.5 2.5 3.5 8 12
12.7 1870 98.6 774 758.5-805
15.2 1830 143 1122 1099.6-1166.9