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
