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Low Relaxation Pre-stressed Concrete (LRPC) Strand/ Wire

 
LRPC Strands

Indian Standard : IS - 14268 / 1995

The Indian Standard for uncoated low relaxation seven ply strand for pre - stressed concrete is covered
under  IS 14268 - 1995. The properties specified in IS 14268 : 1995 are reproduced below:
 

Class Nominal diameter
of Strand
Tolerance Nominal Area
of Strand
Min. Breaking
Strength Of Strand
0.2% Proof load (90% of Breaking Strength Minimum% Elongation GL = 600mm Nominal Weight
of strand
(Approx)
Relaxation Loss Chemical Com-position
  (mm) (+mm) (mm2) (kN) (Kg) (kN) (Kg)   (Kg/Km) % %
  9.50 0.40 51.6 89 9078 80.1 8170   405 2.5 max. at
70% of specified
min.
breaking
load after
1000 hours
OR 1.8
max.at
70% of specified
min.
breaking
load after
100 hours
S = 0.04 max



P = 0.04max
  11.11 0.40 69.7 120.1 12250 108.1 11026   548
I 12.70 0.40 92.9 160.1 16330 144.1 14698 3.5 730
  15.20 0.40 139.4 240.2 24500 216.2 22052   1094
  9.50 +0.66 54.8 102.3 10434 92.1 9394   432
    -0.15              
  11.11 +0.66 74.2 137.9 14065 124.1 12658   582
II   -0.15           3.5  
  12.70 +0.66 98.7 183.7 18737 165.3 16860   775
    -0.15              
  15.20 +0.60 140.0 260.7 26592 234.6 23929   1102
    -0.15              
 
Our Product are also made as per International standard

 * Japanese Specification - JIS 3536

 * American Specification - ASTM A416 - 98a

 * British Specification - BIS 5896 - 1980
 
LRPC Wires
 

International Standards

JIS 3536

Size Tolerance Nominal Area Unit Mass Breaking
Load
0.2% Proof load Min. Elongation Bends Relaxation Loss
mm (mm) (mm2) kg/km (kn) (Kn) % 4 min
for smooth
wire and
3 min for
indented
wire
Nos %
4 +/-0.04 12.57 98.7 21.1 18.6 3.50 (R = 10 mm)
 
2.5 max. at
70% of
specified
min.
breaking
load after
1000 hours
 
5 +/-0.05 19.64 154 31.9 27.9 4.00 (R = 15 mm)
 
6 +/-0.05 28.27 222 44.1 38.7 4.00 (R = 15 mm)
 
7 +/-0.05 38.48 302 58.3 51 4.50 (R = 20 mm)
 
8 +/-0.06 50.27 395 74 64.2 4.50% (R = 20 mm)
 
9 +/-0.06 63.62 499 90.2 78 4.50% (R = 20 mm) 

 

BS5896

Size Tolerance Nominal Area Unit Mass Breaking
Load
0.2% Proof load Min. Elongation Bends Relaxation Loss
mm (mm) (mm2) kg/km (kn) (Kn) % 4 min
for
smooth
wire and
3 min
for
indented
wire
Nos %
4 +/-0.04 12.6 98.7 21 17.9 3.50 (R = 10 mm)
 
2.5 max. at
70% of
specified
min.
breaking
load after
1000 hours
 
4 +/-0.05 12.6 98.7 22.3 19 3.50 (R = 10 mm)
 
4.5 +/-0.05 15.9 12.5 25.8 21.9 3.50 (R = 15 mm)
 
5 +/-0.05 19.6 15.4 32.7 21.8 3.50 (R = 15 mm)
 
5 +/-0.05 19.6 154 34.7 29.5 3.50 (R = 15 mm)
 
5 +/-0.05 19.6 154 36.5 31 3.50 (R = 15 mm)
 
6 +/-0.05 28.3 222 47.3 40.2 3.50 (R = 15 mm)
 
6 +/-0.05 28.3 222 50.1 42.6 3.50 (R = 15 mm)
 
7 +/-0.05 38.5 302 60.4 51.3 3.50 (R = 20 mm)
7 +/-0.05 38.5 302 64.3 54.7 3.50 (R = 20 mm)
 

 

ASTM A881

Size Tolerance Nominal Area Unit Mass Breaking
Load
0.2% Proof load Min. Elongation Bends Relaxation Loss
mm (mm) (mm2) kg/km (kn) (Kn) % 4 min
for
smooth
wire and
3 min
for
indented
wire
Nos %
5.03 +/-0.08 19.86 155.9 30.8 27.7 3.00 (R = 15 mm)
 
2.5 max. at
70% of
specified
min.
breaking
load after
1000 hours
 
5.03 +/-0.08 19.86 154 32.2 29 3.00 (R = 15 mm)
 
5.03 +/-0.08 19.86 154 34.3 30.9 3.00 (R = 15 mm)
 
5.5 +/-0.08 23.7 187.4 42.6 38.3 3.00 (R = 15 mm)
 

 

UNE 36094

Size Tolerance Nominal Area Unit Mass Breaking
Load
0.2% Proof load Min. Elongation Bends Relaxation Loss
mm (mm) (mm2) kg/km (kn) (Kn) % 3 min
 
Nos %
4 +/-0.04 12.6 98.7 23.4 19.9 3.50 (R = 10 mm)
 
2.5 max. at
70% of
specified
min.
breaking
load after
1000 hours
 
5 +/-0.05 19.6 154 36.5 31 3.50 (R = 15 mm)
 
             
 
 
 
 

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