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Binding Wire, Consumption, Chemical Analysis, Finish, Sizes, Tolerances, Tensile, Wrapping, Bend Test, Permissible Defective

Er. Parbhakar Dwivedi
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Binding Wire:

It is used extensively in the construction sector for tying two or more rebar at the joints so as to keep the structural intact.

Binding wire is also called annealed wire and is made of mild steel. Annealing endows it with the properties like flexibility and softness, required its main use.

Tying of Reinforcement Bars for Concrete - Bars crossing each other, where required, shall be secured by binding wire (annealed) of size not less than 0.90 mm and conforming to IS: 280-1962 Specification for Mild Steel Wire, in such a manner that they will not slip over each other at the time of fixing and concreting.

Consumption of Binding Wire: Average consumption of binding wire in footing, wall, column, slab, beam etc. is 8 Kg./ metric tonne (MT.) including wastage.

Chemical Analysis of Steels:

The chemical analysis of the material when carried out either by the method specified in the relevant parts of IS 228 or any other established instrumental/chemical method shall be as given in 1S 7887.

IS: 228 Method of chemical analysis of steel.

IS: 228 analysis of steel
228 (Part 1):1987 Determination of carbon by volumetric method (for carbon 0.05 to 2.50 percent (Third Revision)
228 (Part 2):1987 Determination of Manganese in Plain-Carbon and Low Alloys Steels by Arsenite Method (Third Revision)
228 (Part 3):1987 Determination of phosphorus by alkali metric method (Third Revision)
228 (Part 4):1987 Determination of total carbon by gravimetric method (for carbon greater than or equal to 0.1 percent) (Third Revision)
228 (Part 5):1987 Determination of nickel by dimethyl glyoxime (gravimetric) method (for nickel greater than or equal to 0.1 percent (Third Revision)
228 (Part 6):1987 Determination of Chromium by Persulphate Oxidation Method (for Chromium >0.1 percent ) (Third Revision)
228 (Part 7):1987 Determination of molybdenum by alpha-benzoinoxime method (for molybdenum 1 percent and not containing tungsten) (Third Revision)
228 (Part 8):1987 Determination of silicon by gravimetric method (for silicon 0.05 to 0.50 percent) (Third Revision)
228 (Part 9):1987 Determination of sulphur in plain carbon steels by evolution method (for sulphur 0.01 to 0.25 percent) (Third Revision)
228 (Part 10):1987 Determination of molybdenum by thiocynate (photometric) method in low and high alloy steels (for molybdenum 0.01 to 1.5 percent) (Third Revision)
228 (Part 11):1987 Determination of total silicon by reduced molyddosilicate spectro photo metric method in carbon steels and low alloy steels (for silicon 0.01 to 0.05 percent) (Third Revision)
228 (Part 12):1987 Determination of manganese by periodate spectrophotometric method in low and high alloy steels ( for manganese 0.01 to 5.0 percent) (Fourth Revision)
228 (Part 13):1987 Determination of Arsenic (Superseding IS 1546)
228 (Part 14):1987 Determination of carbon by thermal conductivity method (for carbon 0.005 to 2.000 percent)
228 (Part 15):1987 Determination of copper by thisulphate iodide method (for copper 0.05 to 5 percent) (Second Revision)
228 (Part 16):1987 Determination of tungsten by spectrophotometric method (for tungsten 0.1 to 2 percent (Second Revision)
228 (Part 17):1987 Determination of nitrogen by thermal conductivity method (for nitrogen up to 0.4 percent ) (Second Revision)
228 (Part 18):1987 Determination of oxygen by instrumental method (Second Revision)
228 (Part 19):1987 Determination of nitrogen by steam distillation (Second Revision)
228 (Part 20):1987 Determination of Carbon and Sulphur by Infra-Red Absorption Method (for Carbon 0.005 to 2 percent and Sulphur 0.001 to 0.35 percent)
228 (Part 21):1987 Determination of Copper by Spectrophotometric Method (for Copper 0.02 to 0.50 percent)
228 (Part 22):1987 Determination of Hydrogen in Steel by Thermal Conductivity Method (Hydrogen 0.1 ppm to 50 ppm)
228 (Part 23):1987 Determination of Total Nitrogen in Steel by Optical Emission Spectrometer (Nitrogen 0.002 to 1.0 percent)
228 (Part 24):1987 Determination of Nitrogen in Steel by Inert Gas Fusion – Thermal Conductivity Method (Nitrogen 0.001 to 0.2 percent)

Binding Wire Finish

The wire shall have one of the following finishes as specified by the purchaser:

a) Annealed

b) Annealed, cleaned and limed

c) Bright drawn

d) Dull grey (dry drawn)

e) Galvanized

f) Coppered

g) Tinned; and

h) Coated and drawn (coating may-be of tin, copper or zinc).

Binding Wire Sizes

Mild steel wire for general engineering purposes shall be of the following diameters:

0.125 mm, 0.140 mm, 0.160 mm, 0.180 mm, 0.200 mm, 0.224 mm, 0.250 mm, 0.280 mm, 0.315 mm, 0.355 mm, 0.400 mm, 0.450 mm, 0.500 mm, 0.560 mm, 0.630 mm, 0.710 mm, 0.80 mm, 0.90 mm, 1.00 mm, 1.12 mm, 1.25 mm, 1.40 mm, 1.60 mm, 1.80 mm, 2.60 mm, 2.24 mm, 2.50 mm, 2.80 mm, 3.15 mm, 3.55 mm, 4.00 mm, 4.50 mm, 5.00 mm, 5.60 mm, 6.30 mm, 7.10 mm, 8.00 mm, 9.00 mm, 10.00 mm, 11.2 mm, 12.5 mm

Binding Wire Size Tolerances

Tolerances permitted on the diameter of wire shall be as given

All dimensions in millimetres.
Size of Wire Tolerance Maximum Difference Between Two Readings Taken on Any Two Diameters on the Cross-Section
All finishes other than galvanized:
UP to 0.25 ±0.01 0.01
Over 0.25 up to 0.50 ±0.015 0.015
Over 0.50 up to 1.00 ±0.02 0.02
over 1.00up to 1.50 ±0.03 0.03
Over 1.50 up to 2.50 ±0.04 0.04
Over 2.50 up to 5.00 ±0.05 0.05
Over 5.0 ±0.06 0.06
Galvanized: All sizes ±2.5 percent with a minimum of & ±0.025 2.5 percent with a minimum of & 0.025

Binding Wire Tensile Test:

The tensile strength of wire when tested in accordance with IS 1608 shall be within the limits given in Table

Tensile Strength
Condition Finishes Other Than Galvanized Galvanized
Annealed 500 Max 300-550
Soft drawn 550 Max ..
1/4 hard 450-650 ..
1/2 hard 600-800 ..
Hard 700-950 550-900

Note:

1. 1MPa = l N/mm2 = I MN/m2 = 0.1020 kgf/mm2.

2. Restricted ranges of tensile strength in case of galvanized wire may be agreed to at the time of enquiry and order.

Binding Wire Wrapping Test

Wire smaller than 5 mm diameter shall -be subjected to wrapping test in accordance with IS 1755. The wire shall withstand without breaking or splitting being wrapped eight times round its own diameter and subsequently straightened.

Binding Wire Bend Test

Wire of 5 mm diameter and over shall be subjected to bend test. ‘The wire shall withstand being bent through an angle of 90° round a former of diameter equal to twice its own diameter without breaking or splitting.

Scale of Sampling and Permissible Number of Defective

Scale of Sampling and Permissible Number of Defective
No. of Coils in a Lot No. of Coils for Physical Requirements Permissible Defective No. of Coils for Chemical Requirements
upto25 2 0 1
26-50 3 0 1
51-150 5 0 2
151-300 8 1 2
301 and above 13 1 2

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