DRAFT EAST AFRICAN STANDARD  
 DEAS 412 -3:2018  - Steel for the reinforcement of concrete —
Part 3: Welded  Fabric  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
EAST AFRICAN COMMUNITY  
 
 
 
 
 
  
 
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 Foreword  
Development of the East African Standards has been necessitated by the need for harmonizing requirements 
governing quality of products and services in the East African Community. It is envisaged that  through 
harmonized standardization, trade barriers that are encountered when goods and services are exchanged 
within the Community will be removed.  
In order to achieve this objective, the Community established an East African Standards Committee mandated  
to develop and issue East African Standards.  
The Committee is composed of representatives of the National Standards Bodies in Partner States, together 
with the representatives from the private sectors and consumer organizations. Draft East African Standa rds 
are circulated to stakeholders through the National Standards Bodies in the Partner States. The comments 
received are discussed and incorporated before finalization of standards, in accordance with the procedures 
of the Community.  
East African Standard s are subject to review, to keep pace with technological advances. Users of the East 
African Standards are therefore expected to ensure that they always have the latest versions of the standards 
they are implementing.  
DEAS 412 -3:2018  was prepared by Techn ical Committee EASC /TC 035 Steel and Steel Products  
  
     EAST AFRICA DRAFT STANDARD  
 
 
 
Steel for the reinforcement of concrete — 
 
Part 3 :  
Welded Fabric  
 
1 Scope  
 
This part of East Africa Draft Standard  specifies technical requirements for factory made s heets or rolls of 
welded fabric, manufactured from steel wires or bars with diameters from    2.5 mm to 16 mm and designed for 
the reinforcement of concrete structures and the ordinary reinforcement of pre  stressed concrete structures.  
For the purpose of th is part of  DEAS 412 -3 the term “wire” also includes bars.  
 
 
2 Normative references  
 
The following East Africa Draft Standard  contain provisions which, through reference in this text, constitute 
provisions of this part of East Africa Draft Standard . At the  time of publication, the editions indicated were 
valid. All standards are subject to revision, and parties to agreements based on this part of IS0 6935 are 
encouraged to investigate the possibility of applying the most recent editions of the standards ind icated below. 
Members of IEC and IS0 maintain registers of currently valid International Standards.  
 
IS0 404:1992, Steel  and steel products – General technical delivery requirements.  
 
IS0 6892:1984, Metallic materials - tensile testing.  
 
CD/TZ/4:2016 , Stee l for the reinforcement of concrete - Part 1: Plain bars.  
 
CD/TZ/5:2016 , Steel for the reinforcement of con crete - Part 2: Ribbed bars.  
 
IS0 10065:1990, Steel bars for reinforcement of concrete - Bend and rebend tests.  
 
IS0 10287: --1), Steel for the reinfo rcement of concrete - Determination of strength of joints in welded  
fabric.  
 
 
IS0 10544: -1), Cold -reduced steel wire for the reinforcement of concrete and the manufacture of welded 
fabric.  
 
 
IS0 11082: --1), Certification scheme for -welded fabric for the  reinforcement of concrete structures.                                                                                                                                                                      
  
© EAC 2018      First  Edition 2018  
  
 
 
3 Definition  
 
For the purposes of this part of East Africa Draft Standard , the following definitions apply.  
 
3.1 test unit :  
The number of pieces or the tonnage of products to be accepted or rejected together, on t he basis of the tests 
to be carried out on sample products in accordance with the requirements of the product standard or order. 
[ISO 4041  
 
3.2 certification scheme :  
Certification system as related to specified products, processes or services  
to which the  same particular standards and rules, and the same procedure, apply. ( ISO/IEC Guide 21)  
 
3.3 characteristic value :  
Value having a prescribed probability of not being attained in a hypothetical unlimited test series. [ISO 89301  
 
NOTE 1 Equivalent to fracti le, which is defined in IS0 3534.  
 
3.4 fabric:  
 A geometrical arrangement of longitudinal and transverse wires that are arranged substantially at right angles 
to each other and welded together at all points of intersection.  
 
3.5 inspection:  
Activities suc h as measuring, examining, testing, gauging one or more characteristics of a product or service 
and comparing these with specified requirements to determine conformity. [ISO 8402)  
 
3.6 length of fabric :  
The longest side of the fabric, irrespective of the manufacturing direction.  
 
3.7 longitudinal wire :  
Wire in the manufacturing direction of the fabric.  
 
3.8 nominal cross -sectional area :  
The cross -sectional area equivalent to the area of a circular plain wire of nominal diameter.  
 
3.9 overhang :  
The lengt h of longitudinal or transverse wires beyond the centre of the outer crossing  
wire in a fabric. For twin wire fabric, the overhang is measured from the tangent line of the adjacent wires. 
(See figure I.)  
 
3.10 spacing : 
The centre -to-centre distance of wire s in a fabric. For twin wire fabric, the spacing is measured between 
tangents of the adjacent wires. (See figure I.)  
 
3.11 transverse wire:  
Wire perpendicular to the manufacturing direction of the fabric.  
 
3.12 twin wires :  
Two wires of the same type and size placed adjacently and in contact with each other as a pair.  
 
3.13 width of fabric :  
The shortest side of the fabric irrespective of the manufacturing direction.  
 
3.14 wire:   
The material from which the fabric is welded.  
 
NOTE 2  For the purposes of thi s part of IS0 6935, the term “wire” also includes bars within the size range specified  in 4.1 
.l. 
 
 
 
 
 
                                                                                                                                                                       
  
© EAC 2018      First  Edition 2018  
  
4 Form and dimensions  
This part of East Africa Draft Standard  covers  regular fabric (4.2) and designed fabric (4.3  
 
 
 
 
 
4.1 General requirements  
 
4.1.1 The fabric shall be made of either   
      -      cold-reduced wires with nominal diameters in the range from   2 .5 mm to 16 mm (recommended:  2.5, 
3, 4, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm and 12 mm) and with mass and geometry complying with IS0 
10544;  
 
Or 
- plain bars with nominal diameters of 6 mm,8 mm, 10 mm, 12 mm or 16 mm (recommended: 6 mm, 8 
mm, 10 mm and 12 mm) and with mass complying with  DEAS 412 -1; 
Or 
 
- ribbed bars with nominal diameters of 6 mm, 8 mm, 10 mm, 12 mm or 16 mm (recommended: 6 mm, 
8 mm, 10 mm and 12 mm) and with mass and geometry complying with  DEAS 412 -2. 
 
 
4.1.2  All fabric shall be machine made, and the joints at the intersections of the longitudinal ‘and transverse 
wires shall be made by electrical resistance welding to provide shear  resistant connections complying with 
clause 6  
 
4.1.3 Each sheet of fabric shall contain the number of wires appropriate to its specified length, width, spacing  
and overhang dimensions  as in annex 1  
 
 
 
The number of broken welds shall not exceed either 1 %  of the total number of cross -welded joints in the  
sheet or half the number of cross -welded joints along any one wire.  
 
 
4.1.4  Fabric shall be free from any defect which can be shown to affect adversely the mechanical properties  
of the steel. Fabric inclu ding butt -welded wires shall be permitted and missing wires resulting from test 
sampling in accordance with clause 7 shall not be considered as defects.  
 
 
4.1.5  The longitudinal wires may be single or twin wires. The transv erse wires shall be single wire  
 
4.1.6  The diameters of crossing wires in single wire fabric shall meet the following requirement:  
 d min  ≥0.36  d max 
 
where  
 
 
d max is the nominal diameter of the thickest  wire;  
 
d min is the nominal diameter of the wire.  
 
For twin -wire fabric, the wire diameters shall meet the following requirement:  
 
 
0.7d T < d L < 1.25 d T, 
 
where  
 
                                                                                                                                                                      
  
© EAC 2018      First  Edition 2018  
 d T is the nominal diameter of the transverse wire;  
d L is the nominal diameter of one of the twin wires.  
 
 
 
4.1.7  The dimensions of the fabric shall be specified as gross le ngth in both directions.  
 
The preferred sheet sizes,  to be 4.2 m x 2.1 m and 4.8 m x 2.4 m.  
 
The preferred roll sizes, to be 30m x 2.1 m, 30 m x 2.4 m, 48 m x 2.1 m, and 48 m x 2.4 m.  
  
The length and width of the sheet or roll to be measured from the tip s of the overhangs  
 
 
4.1.8  The permitted are geometric deviations for fabric are:  
 
The tolerance on the cold reduced wire diameter of the welded fabric shall be ± 2.5 % of the nominal diameter 
and for hot rolled wires the mass per metre length tolerances in respective material standards shall apply  
 
Wire Spacing:  ± 10mm or ± 7.5% whichever is greater  
 
Deviations on the dimensions of the sheet or roll shall be + 25 mm for lengths of up to 5m, and +0.5% for 
lengths exceeding 5m.  
 
Tolerance on the mass of fa bric shall be +6% or -4%. 
 
 
 
4.1.9  The recommended spacing of longitudinal wires is a multiple of 50 mm and preferably not less than 100 
mm. 
The recommended spacing of transverse wires is a multiple of 25 mm and preferably not less than 100 mm.  
 
 
4.2 Geome try of regular fabric  
 
Regular fabric is characterized by having wires of equal nominal diameter across the length and width  
of the fabric. The spacing is also constant in each direction. The wire diameters and spacing may differ for the 
two directions.  
 
All the wires in one direction shall be of equal length. The recommended overhang, u, is not less than 25 mm.  
 
The preferred mesh sizes, wire sizes and mass per square metre shall be as given in Tables 2, 3, 4 and 5  on 
Annex  K 
 
4.3 Geometry of designed fabr ic 
 
Designed fabric differs from regular fabric, which is described in 4.2.  
 
The geometry and dimensions of designed fabric shall be agreed between the manufacturer and purchaser, 
and shall be specified on a -drawing. The recommended overhang, U, is not les s than 25 mm  
 
 
5 Chemical composition  
 
The chemical composition of the welded fabric shall comply with the product analysis requirements of  
 
 
- IS0 10544 for cold -reduced wires;  
 
DEAS 412 -1 for plain bars;  
 
- DEAS 412 -2 for ribbed bars.  
 
 
 
6 Mechanical pro perties  
 
The tensile and bending properties of the welded fabric shall comply with the requirements of  
 
- IS0 10544 for cold -reduced wires;  
 
-  DEAS 412 -1 for plain bars;  
 
- DEAS 412 -2 for ribbed bars.                                                                                                                                                                        
  
© EAC 2018      First  Edition 2018  
  
The strength of the welded joints, in newtons, shall be at least 30 % of the specified characteristic yield or 
proof stress multiplied by the nominal cross -sectional area of the thickest wire.  
 
 
7 Testing of mechanical properties  
 
The testing shall be done on wires taken from the fabric in the delivery condi tion. The test piece shall not be 
worked before testing but it may be heated to 100 “C and then cooled freely in air to the test temperature.  
 
 
7.1 Tensile test  
 
The tensile properties shall be determined according to IS0 6892. The test piece shall have an  original gauge 
length of five times the nominal diameter and shall have at least one crossing wire. The free distance between 
the grips shall be at least 20 times the nominal diameter, and not less than 180 mm.  
 
In fabric with twin wires, the wire which i s not under test shall be cut off approximately 20 mm from the joints.  
 
For calculation of yield or proof stress and tensile strength, the nominal cross -sectional area of the wire shall 
be used.  
 
 
7.2 Bend test  
 
The bend test shall be carried out according  to IS0 10065  
 
The test piece shall be taken from the thickest wire in fabric with single wires in both directions. In the case  of 
twin-wire fabric, the test piece shall be taken from the twin wire.  
 
The length of the test piece shall be at least 200 mm, a nd it shall be free from crossing wires in the length 
subject to bending.  
The test piece shall be bent to an angle between 160” and 180’ over a mandrel of the diameter specified in  
 
 
- IS0 10544 for cold -reduced wires;  
 
- DEAS 412 -1 for plain bars;  
 
-  DEAS 412 -2 for ribbed bars.  
The angle of bend shall be measured before unloading.  
 
 
                     
                                     Figure 2  
 
                                                                                                                                                                      
  
© EAC 2018      First  Edition 2018  
 7.3 Strength of welded joints  
 
The joints shall be tested according to IS0 10287. A test piece with the re commended minimum dimensions  
shown in figure2 shall be cut from the fabric. In addition to the weld to be tested, the test piece may have one 
or more welds, depending on the spacing.  
For fabric with single wires in both directions, the thicker wire shall b e used as the pulling wire.  
For fabric with twin wires, one of the twin wires shall be the pulling wire. The other twin wire is cut off  
from the crossing wire without affecting the weld under test.  
Test pieces previously subjected to tensile testing -may b e used for the weld shear test, provided that the 
necking at the fracture is clear of the weld zone  
 
8 Designation  
 
8.1 Regular fabric  
 
Regular fabric shall be designated in the following order:  
- welded fabric DEAS  412-3:2018  
- spacing in the direction of  length and width respectively, in millimetres;  
- length x width, in metres;  
- designation of the wires in the direction of length and width respectively, according to the International 
Standard whose requirements shall apply  
Example of designation of regu lar fabric:  
Welded fabric DEAS 412 -3 - 150 mm x 200 mm -5 m x 2 m, reinforcing steel IS0 10544, 8 mm indented,  
Reinforcing steel IS0 10544 6 mm indented.  
 
8.2 Designed fabric  
 
Designed fabric according to this part of IS0 6935 should be designated in the f ollowing order:  
- welded fabric DEAS 412 -3; 
- D (for designed);  
- length x width, in metres;  
- drwg. No. (for drawing);  
- pos. No. (for position);  
- designation of the wires according to the International Standard whose requirements shall apply.  
 
Example of designatio n of designed fabric:  
Welded fabric DEAS 412 -3-D 6,2 m x 3,4 m, drwg. No. 318 - pos. No. 3, Reinforcing steel IS0 693592 - 16 RB 
5OOW, Reinforcing steel IS0 6935 -l -10 PB 300  
 
9 Marking  
 
Each bundle of welded fabric shall have a label stating the manufactur er, the number of this part of  East Africa 
Draft Standard  (DEAS 412 -3:2018 ) and a reference number related to the test certificate. For designed fabric,  
the position number shall be included.  
 
Each sheet and each bundle shall be legibly and indelibly marke d as follows;  
Each sheet  shall be marked with  manufacturers name or logo, steel grade and nominal diameter  
Each bundle shall be marked with manufacturers name or logo, steel grade, nominal diameter and batch  / cast 
numbe r. 
. 
Roll and sheet of width 2.1m sh all in addition be marked  with a strip of paint of color code RAL 1003 YELLOW 
along the length at least  200mm deep .  
 
10 Certification and inspection  
                                                                                                                                                                       
  
© EAC 2018      First  Edition 2018  
 Certification and inspection of reinforcement shall be performed  
- in accordance with a certification schem e monitored by an external body, see IS0 11082;  
-  according to testing of a specific delivery.  
 
10.1 Certification scheme  
 
In the case of certification scheme, certification and inspection shall be performed in accordance with IS0 
11082.  
 
10.2 Testing of a specific delivery  
Provisions regarding the nature, extent and evaluation of acceptance tests on deliveries of welded fabric not 
subject to a certification scheme are given in 10.3 and 10.4.  
 
Testing of a specific delivery shall be performed according to 10 .3. 
 
By agreement between manufacturer and purchaser, 10.4 may be used.  
 
10.3 Verification of conformity  
 
10.3.1 Organization  
 
The tests shall be organized and carried out according to an agreement between purchaser and  
manufacturer, taking into considerat ion the national rules of the receiving country.  
 
10.3.2 Extent of sampling and testing  
 
For the purpose of testing, the delivery shall be subdivided into test units with a maximum mass of 25 t or a 
fraction thereof. Each test unit shall consist of product s of the same fabric type and from the same production 
lot. 
 
Fifteen test pieces (if appropriate 60 test pieces; see10.3.3.1) from various fabrics shall be taken from each 
test unit  
 
 
10.3.3 Evaluation of the results  
 
 
10.3.3.1 Inspection by variables  
 
For properties, which are specified as characteristic values, the following shall be determined:  
 
a) all individual values, xi, of the 15 test pieces (n = 15); 
 
b) the mean value m15 (for n = 15); 
 
      c) the standard deviation s15, (for n = 15). 
The test unit co rresponds to the requirements if the condition stated below is fulfilled for all properties:  
 
M15 – 2.33 x s15 ≥  f k 
where  
f k is the required characteristic value;  
 
2,33 is the value for the acceptability index k for n = 15 for a failure rate of 5 %A0  
ρ, = 095) at a probability of 90 % (1 - α = 0.90).  
 
If the condition stated above is not fulfille d, the index  
 
 
is determined  from the test results available. Where k’ > 2, testing can be continued. In this case 45 additional  
test pieces shall be taken and tested from various fabrics, so that a total of 60 test results are available 
(n=60).  
 
                                                                                                                                                                      
  
© EAC 2018      First  Edition 2018  
 The test  unit shall be considered to comply with the requirements if the condition stated below is fulfilled for all 
properties.  
             
                      M60 - 1393 x S60) > fk 
 
where I.93 is the value for the acceptability index k for n = 60 for a failu re rate of 5 % (p = 0,95) at a probability 
of 90 % (1 - α = 0,90).  
 
 
10.3.3.2 Inspection by attributes  
 
When testing properties specified as maximum or minimum values, all results determined on the 15 test 
pieces shall comply with the requirements of this part of East Africa  Draft Standard . In this case the test unit 
shall be considered to comply with the requirements.  
 
The tests can be continued when at most 2 results not conforming to conditions occur. In this case 45  
further test pieces from various fabr ics in the test unit shall be tested, so that a total of 60 test results are 
available’. The test unit complies with the requirements if at most 2 of the 60 results do not conform to the 
conditions.  
 
 
10.4 Verification of guaranteed minimum values  
 
Tests s hall be carried out according to the following.  
 
Tests shall be carried out according to the following.  
 
- For the purpose of testing, the delivery shall be subdivided into test units with a maximum mass of 50 t or a 
fraction thereof. Each test unit shall  consist of products of the same nominal diameter from the same 
production lot.  
 
-For each mechanical property’ specified, one test shall be carried out for each -test unit. Each individual test 
result shall meet the requirements specified in clause 6.  
 
- If any test result does not meet the requirements, retests may be carried out, according to IS0 404  
 
-the manufacturer shall submit a test report stating that products of the delivery satisfy the mechanical 
properties specified in clause 6 and a confirmatio n that the other requirements of this part of IS0 6935 are 
fulfilled.  
 
 
 
11 Test report  
 
The test report shall contain the following information:  
 
a) works producing the welded fabric;  
 
b) designation of the fabric according to clause 8;  
 
c) number on the bundle;  
 
      d) name of the organization carrying out the test, if appropriate;  
 
e) date of testing;  
 
f) mass of the test unit;  
 
g) test results.  
 
 
 
 
 
 
 
                                                                                                                                                                       
  
© EAC 2018      First  Edition 2018  
  
 
 
  
ANNEX K  
 
 
 
 
 
 
 
                                                                                                                                                                      
  
© EAC 2018      First  Edition 2018  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                                                                                                                                                                      
  
© EAC 2018      First  Edition 2018  
 Annex 1  
Weld mesh dimensions  
Mesh 
Referen c
e Size Box Size 
(Pitch of 
wires, mm)  
 Wire Diameter 
(mm)  Sheet Size (mm)  Overhang  Number of 
wires 
nominally  Mass 
Per 
Sheet 
(kg) 
Mai
n Cross  Main  Cross  Lengt
h Width  Main  Cro
ss Lengt
h Wid
th Nomin
al                 Cross  Mai
n 
WM 5030  50 x 50 x 3  50 50 3.0 3.0 2440  1220  25.0 25.0 49 24 6.6 
WM 5035  50 x 50 x 
3.5 50 50 3.5 3.5 2440  1220  25.0 25.0 49 24 8.9 
WM 5040  50 x 50 x 4  50 50 4.0 4.0 2440  1220  25.0 25.0 49 24 11.7 
WM 6030  60 x 60 x 3  60 60 3.0 3.0 2440  1220  30.0 30.0 41 20 5.5 
WM 6040  60 x 60 x 4 60 60 4.0 4.0 2440  1220  30.0 30.0 41 20 9.7 
WM 6530  65 x 65 x 3  65 65 3.0 3.0 2440  1220  32.5 32.5 38 19 5.1 
WM 6535  65 x 65 x 
3.5 65 65 3.5 3.5 2440  1220  32.5 32.5 38 19 7.0 
WM 6540  65 x 65 x 4  65 65 4.0 4.0 2440  1220  32.5 32.5 38 19 9.1 
WM 7525  75 x 75 x 
2.5 75 75 2.5 2.5 2440  1220  37.5 37.5 33 16 3.1 
WM 7530  75 x 75 x 3  75 75 3.0 3.0 2440  1220  37.5 37.5 33 16 4.4 
WM 7535  75 x 75 x 
3.5 75 75 3.5 3.5 2440  1220  37.5 37.5 33 16 6.0 
WM 7540  75 x 75 x 4  75 75 4.0 4.0 2440  1220  37.5 37.5 33 16 7.8 
WM 7 540 75 x 75 x 5  75 75 5.0 5.0 2440  1220  37.5 37.5 33 16 12.2 
                          
BM 5030  50 x 50 x 3  50 50 3.0 3.0 1830  915 25.0 25.0 37 18 3.7 
BM 5035  50 x 50 x 
3.5 50 50 3.5 3.5 1830  915 25.0 25.0 37 18 5.0 
BM 5040  50 x 50 x 4  50 50 4.0 4.0 1830 915 25.0 25.0 37 18 6.6 
BM 6530  65 x 65 x 3  65 65 3.0 3.0 1830  915 32.5 32.5 28 14 2.8 
BM 6535  65 x 65 x 
3.5 65 65 3.5 3.5 1830  915 32.5 32.5 28 14 3.9 
BM 6540  65 x 65 x 4  65 65 4.0 4.0 1830  915 32.5 32.5 28 14 5.1 
BK 5030  50 x 50 x 3  50 50 3.0 3.0 1830 760 25.0 25.0 37 15 3.1 
BK 5035  50 x 50 x 
3.5 50 50 3.5 3.5 1830  760 25.0 25.0 37 15 4.2 
BK 5040  50 x 50 x 4  50 50 4.0 4.0 1830  760 25.0 25.0 37 15 5.5 
BK 6530  65 x 65 x 3  65 65 3.0 3.0 1830  760 32.5 32.5 28 12 2.4 
BK 6535  65 x 65 x 
3.5 65 65 3.5 3.5 1830  760 32.5 32.5 28 12 3.3 
BK 6540  65 x 65 x 4  65 65 4.0 4.0 1830  760 32.5 32.5 28 12 4.3 
 
 
 
 
Rectangular Mesh  
 
 50 x 25 x 
2.5 50 25 2.5 2.5 2440  1220  25.0 12.5 98 24 6.9 
 50 x 25 x 3  50 25 3.0 3.0 2440  1220  25.0 12.5 98 24 9.9 
 50 x 25 x 4  50 25 4.0 4.0 2440  1220  25.0 12.5 98 24 17.6 
 75 x 25 x 
2.5 75 25 2.5 2.5 2440  1220  37.5 12.5 98 16 6.1 
 75 x 25 x 3  75 25 3.0 3.0 2440  1220  37.5 12.5 98 16 8.8 
 75 x 25 x 4  75 25 4.0 4.0 2440  1220  37.5 12.5 98 16 15.6 
 75 x 30 x 3  75 30 3.0 3.0 2440  1220  37.5 15.0 81 16 7.6                                                                                                                                                                       
  
© EAC 2018      First  Edition 2018  
  75 x 30 x 4  75 30 4.0 4.0 2440  1220  37.5 15.0 81 16 13.6 
 
a)    WM denotes weld mesh.  
 
b)    BM and BK denote bed mesh