DEAS 412 -2:2018  
  
 
DRAFT EAST AFRICAN STANDARD  
 DEAS 412 -2:2018 - Steel for the reinforcement of concrete —
Part 2: Ribbed  bars  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
EAST AFRICAN COMMUNITY  
 
 
 
 
 
 
 
 
 
 
 
 
 
                                                         DEAS 412 -2:2018  
 Copyright notice  
This EAC document is copyright -protected by EAC. While the reproducti on of this document by 
participants in the EAC standards development process is permitted without prior permission from EAC, 
neither this document nor any extract from it may be reproduced, stored or transmitted in any form for 
any other purpose without pr ior written permission from EAC.  
Requests for permission to reproduce this document for the purpose of selling it should be addressed as 
shown below or to EAC’s member body in the country of the requester:  
© East African Community 2016  — All rights reserved  
East African Community  
P.O.Box 1096  
Arusha  
Tanzania  
Tel: 255 27 2504253/8  
Fax: 255 27 2504481/2504255  
E-mail: eac@eachq.org  
   Web: www.eac -quality.net  
Reproduction for sales purposes may be subject to royalty payments or a licensing agreement.  Violators 
may be prosecuted.  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
                                                         DEAS 412 -2:2018  
 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 envisa ged 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 Africa n Standards 
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 Standards 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 -2:2018 was prepared by Technical Committee EASC /TC 035 TC Steel and Steel Products  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
                                                         DEAS 412 -2:2018  
 EAST AFRICA DRAFT STANDARD  
 
 
 
 
 
 
 
Steel for the reinforcement of concrete —Part 2: Ribbed  bars  
 
 
 
 
1 Scope  
 
This part of East Africa Draft Standard  specifies technical requirements for ribbed bars to be used as 
reinforcement in concrete.  
 
This part of East Africa Draft Standard  covers ten steel grades not intended for welding which are B300A - R, 
B300B -R, B300C -R, B300D -R, B400A -R, B400B -R, B400C -R, B500A - R, B500B -R and B500C -R, and eleven 
steel grades intended for welding which are B300DWR, B350DWR, B400AWR, B400BWR, B400CWR, 
B400DWR, B420DWR, B500AWR, B500BWR, B500CWR aB500DWR ,B550DWR and B600DWR . The steel 
grades are designated with steel names all ocated in accordance with ISO/TS 4949.  
 
NOTE The first “B” stands for steel for reinforcing concrete. The next 3 digits represent the specified characteristic value of 
upper yield strength. The fifth symbol stands for ductility class (4.5). The sixth symbo l relates to welding; “ -” means not 
intended for welding and “W” means intended for welding. The last “R” stands for ribbed bar.  
 
This part of East Africa Draft Standard covers products  delivered in straight lengths.  
 
The production process is at the discr etion of the manufacturer.  
 
Ribbed bars produced from finished products, such as plates and railway rails, are excluded.  
 
 
2 Normative references  
 
The following referenced documents are indispensable for the application of this document. For dated 
referenc es, only the edition cited applies. For undated references, the latest edition of the referenced 
document (including any amendments) applies.  
 
ISO 404, Steel and steel products — General technical delivery requirements  
 
ISO/TS 4949, Steel names based on le tter symbols  
 
ISO/TR 9769, Steel and iron — Review of available methods of analysis  
 
ISO 10144, Certification scheme for steel bars and wires for the reinforcement of concrete structures  
 
ISO 14284, Steel and iron — Sampling and preparation of samples for the determination of chemical  
composition  
 
ISO 15630 -1, Steel for the reinforcement and prestressing of concrete — Test methods — Part 1: Reinforcing  
bars, wire rod and wire  
 
 
 
 
 
 
 
 
 
 
  
 
                                                         DEAS 412 -2:2018  
 3 Symbols  
 
The symbols used in this part of East Africa Draft Standard  are listed in Table 1.  
 
Table 1 — Symbols   
Symbol  Unit Description  Reference  
    
a mm Rib height  4.10, Clause 6  
    A
5 % Percentage elongation after fracture  8.1, 9.1  
A
gt % Percentage total elongation at maximum force  8.1, 9.1  
An mm2 
Nominal cross -sectional area  Clause 5, 9.1  
c mm Rib spacing  4.11, Clause 6  
    
d mm Nominal diameter of the bar  Clause 5, Clause 6, 9.1, 9.2,  
   9.3, Clause 10, 11.2,  
    
Σfi mm Ribless perimeter  4.12, Clause 6  
f
k — Required characteristic value  12.3.2.3  
fR — Relative rib area  4.9, Clause 6  
k, k' — Indices  12.3.2.3.1  
    m
n — Mean value of n individual values  12.3.2.3.1  
n — Number of individual values  12.3.2.3.1  
    R
eH N/mm2 
Upper yield strength  8.1 
Rm N/mm2 
Tensile strength  8.1 
R
p0,2 N/mm2 
0,2 % proof strength, non -proportional extension  8.1 
sn — Standard deviation for n individual values  12.3.2.3.1  
x
i — Individual value  12.3.2.3.1  
α degree  Transverse -rib flan k inclination  4.14, Clause 6  
    
β degree  Angle between the axis of a transverse rib and the bar axis  4.15, Clause 6  
    
 
 
4 Terms and definitions  
 
For the purposes of this document, the following terms and definitions apply.  
 
4.1  
cast an alysis  
chemi cal analysis representative of the cast determined by the manufacturer in accordance with his /her own 
procedures  
 
4.2  
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  
  
 
                                                         DEAS 412 -2:2018  
 4.3  
characteristic value   
value having a prescribed probability of not being attained in a hypothetical unlimited test series  
 
NOTE 2  A nominal value is used as the characteristic value in some circumstances.  
 
4.4 
core  
part of the cross -section of the bar containing neither ribs nor indentations  
 
 
4.5  
ductility class  
classification of the ductility properties of reinforcing steels based on the value of the ratio of tensile strength to 
yield strength, as well as the elongation measured either as Agt or as A5 
 
NOTE  See Table 6.  
 
4.6  
longitudinal rib   
uniform continuous rib parallel to the axis of the bar  
 
 
4.7  
nominal cross -sectional area   
cross -sectional area equivalent to the area of a circular plain bar of the  nominal diameter  
 
 
 
4.8  
product analysis   
chemical analysis carried out on the product  
 
4.9  
relative rib area fR  
area of the projections of all transverse ribs within a defined length on a plane perpendicular to the 
longitudinal axis of the bar, divide d by this length and the nominal circumference  
 
. 
 
4.10  
Rib height a 
distance from one point on the rib to the surface of the core, to be measured normal to the axis of the bar  
 
NOTE 1  See Figure 2.   
 
                                                         DEAS 412 -2:2018  
  
 
 
4.11 rib spacing c  
distance between the centres of t wo consecutive transverse ribs measured parallel to the axis of the bar  
 
NOTE 1  See Figure 1.  
 
 
4.12  
ribless perimeter Σfi  
sum of the distances along the surface of the core between the end of the transverse ribs of adjacent rows 
measured as the projectio n on a plane perpendicular to the axis of the bar  
 
 
4.13  
Transverse rib   
rib at an angle, either perpendicular or oblique, to the longitudinal axis of the bar  
 
 
4.14  
transverse -rib flank inclination α  
angle between the flank of a transverse rib and the c ore surface of a bar measured perpendicular to the 
longitudinal axis of the transverse rib  
 
NOTE 1  See Figure 2.  
 
 
4.15  
transverse -rib inclination β  
angle between the rib and the longitudinal axis of the bar  
 
NOTE 1  See Figures 1, 3 and 4.  
 
 
 
5 Dimensions , mass per unit length and permissible deviations  
 
Dimensions, mass per unit length and permissible deviations are given in Table 2. However, manufacturer and 
purchaser  may agree on  special ordered diameter  upon  notification to  the regulator . 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
                                                         DEAS 412 -2:2018  
  
 
Table 2 — Dimensions, mass per unit length and permissible deviations   
 Nominal bar   Nominal cross - Mass per unit length  
 diameter a  sectional area b   
 d  An Requirement c Permissible deviation d 
 mm  mm2 
kg/m  % 
 6  28,3 0,222  6 
 8  50,3 0,395  6 
 10  78,5 0,617  5 
 12  113 0,888  5 
 14  154 1,21 5 
 16  201 1,58 5 
 20  314 2,47 5 
 25  491 3,85 4 
 28  616 4,84 4 
 32  804 6,31 4 
 40  1 257  9,86 4 
 50  1 964  15,42  4 
      
a Diameters  larger  than  50 mm  shoul d  be  agreed  between  the  manufacturer  and  purchaser.  The  
permissible deviation on such bars shall be ± 4 % .   
b An= 0,785 4×  d2    
c Mass per unit length = 7,85 × 10−3 × A.   
   n   
d Permissible deviation refers to a single bar.    
      
 
 
. 
 
NOTE  Common delivery lengths of straight bars are 6 m, 9 m, 12 m and 18 m.  
 
            , the permissible deviation on delivery lengths from rolling mill shall be 100
0mm . 
 
 
6 Requirements for ribs  
 
Ribbed bars shall have transverse ribs. Longitudinal r ibs may be present or not.  
 
There shall be at least two rows of transverse ribs equally distributed around the perimeter of the bar. The 
transverse ribs within each row shall be distributed uniformly over the entire length of the bar, except in the 
area of  marking.  
 
Ribs shall conform to the requirements in Table 3.  
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
                                                         DEAS 412 -2:2018  
 
 
 
Table 3 — Requirements for ribs   
 Nominal diameter  Ribs of uniform  Crescent -shaped ribs  
 d height   
 mm   
    
Rib height, a 
All 0,05 d 0,065 d Minimum     
    
Rib spacing , c 6 u d< 10 0,5d u c u 0,7 d 0,5d u c u 1,0 d 
Range  d W10 0,5d u c u 0,7 d 0,5d u c u 0,8 d 
Transverse -rib inclination, β All 35° u β u 90°  35° u β u 75°  
Transverse -rib flank inclination, α All α W45°  α W45°  
Ribless perimeter, Σ fi All  0,25 dπ 
Maximum     
 
Requirements for rib parameters may be specified by the relative rib area, by agreement between the 
manufacturer and purchaser. Measurement of rib parameters shall be performed in accordance with ISO 
15630 -1. 
 
Dimensions defining the rib geometry in T able 3 are shown in Figures 1 to 4.  
 
When longitudinal ribs are present, their height shall not exceed 0,15 d. 
 
 
 
 
 
 
 
 
 
 
 
 
Key  
1 longitudinal rib   
2 transverse rib  
 
Figure 1 — Ribbed bar — Definitions of geometry  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Key  
1 rib  
2 rounded transition  
 
Figure 2 — Rib flank inclination, α, and rib height, a — Section A -A from Figure 1  
 
 
 
 
 
 
 
  
 
                                                         DEAS 412 -2:2018  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Figure 3 — Example of bar with varying rib inclinations to the longitudinal axis  
 
 
 
 
 
 
 
 
 
 
 
Figure 4 — Example of bar with transverse ribs  of uniform height (β= 90°)  
 
 
7 Chemical composition  
 
The chemical composition of the steel, as determined by cast analysis, shall conform to Table 4. 
The carbon equivalent, CEV, is calculated according to the following formula.  
 
CEV  C Mn (Cr  V  Mo) (Cu  Ni) (1) 
 
5 15 6    
 
where C, Mn, Cr, V, Mo, Cu and Ni are the mass fractions, expressed as percentages, of the respective 
chemical elements of the steel.  
 
The permissible deviation of the product analysis relative to the cast analysis a s specified in Table 4 are given 
in Table 5.  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
                                                         DEAS 412 -2:2018  
  
 
 
Table 4 — Chemical composition based on cast analysis — Maximum values of mass fractions, 
in percentage   
Steel grade  C a 
Si Mn P S N b CEV a, c 
B300A -R        
B300B -R        
B300C -R        
B400A -R        
B400B -R — — — 0,060  0,060  — — 
B400C -R        
B500A -R        
B500B -R        
B500C -R        
B400AWR d        
B400BWR         
B400CWR  
0,22 0,60 1,60 0,050  0,050  0,012  0,50 B500AWR         
B500BWR         
B500CWR         
        
B300D -R — — — 0,050  0,050  — — 
        
B300DWR  0,27 0,55 1,50 0,040  0,040  0,012  0,49 
        
B350DWR  0,27 0,55 1,60 0,040  0,040  0,012  0,51 
        
B400DWR  0,29 0,55 1,80 0,040  0,040  0,012  0,56 
        
B420DWR d 
0,30 0,55 1,50 0,040  0,040  0,012  0,56 
B500DWR  0,32 0,55 1,80 0,040  0,040  0,012  0,61 
B550DWR  0.25   0.035  0.040    
B600 0DWR  0.30   0.035  0.040    
        a For B400AWR, B400BWR, B400CWR, B500AWR, B500BWR and B500CWR with diameters larger than 32 mm, the maximum   
carbon content (C) is 0, 25 % and the maximum carbon equivalent (CEV) is 0,55 %.  b A higher mass fraction of nitrogen may be used, if sufficient quantities of nitrogen -binding elements are present.  
c Other CEV formulae and values may be used by agreement between the manufacturer a nd purchaser.  
d Alloy elements, such as Cu, Ni, Cr, Mo, V, Nb, Ti and Zr, may be added by agreement between the manufacturer and purchaser.  
 
 
 
Table 5 — Chemical composition based on product analysis — Permissible deviation 
of the product analysis in perc entage by mass   
Elements  Specified maximum value in  Permissible deviation in product  
 cast analysis in Table 4  analysis from the specified limits of  
  the cast analysis in Table 4  
 % % 
   
C u 0,25   0,02 
 0,25  0,03  
   
Si u 0,60   0,05 
   
Mn u 1,65   0,06 
  
 1,65  0,08  
   
P u 0,05   0,008  
  
 0,05  0,010   
   
S u 0,05   0,008  
  
 0,05  0,010   
   
N u 0,012   0,002  
   
 
 
 
  
 
                                                         DEAS 412 -2:2018  
  
 
 
8 Mechanical properties  
 
8.1 Tensile properties  
 
The tensile test shall be performed in ac cordance with 9.1.  
 
The material shall conform to the requirements for tensile properties specified in Table 6.  
 
In the context of this part of East Africa Draft Standard , the characteristic value is (unless otherwise indicated) 
the lower or upper limit of  the statistical tolerance interval at which there is a 90 % probability (1 − α = 0,90) 
that 95 % ( p = 0,95) of the values are at or above this lower limit, or are at or below this upper limit, 
respectively. This definition refers to the long -term quality level of production.  
 
Table 6 — Tensile properties   
   Specified characteristic value   Ductility properties    
        
   
Specified      
   of upper yield strength   Specified characteristic        characteristic  
Ductility    R
eH value of elongation  a 
Steel grade   value of   
 class    N/mm2 
Rm/ReH   %         
          
   Minimum   Maximum  Minimum   A
5  A
gt 
        Minimum   Minimum  
  B300A -R 300  —   16   
           
 
A B400A -R 400  
— 1,02    
2  B400AWR      
     
14  
          
  B500A -R 500  
—     
        
  B500AWR        
          
           
  300B -R 300  —   16   
           
 
B B400B -R 400  — 1,08    
5  B400BWR      
     
14  
          
  B500B -R 500  
—     
        
  B500BWR        
          
           
  B300C -R 300  —   16   
           
 
C B400C -R 400  
— 1,15    
7  B400CWR      
     
14  
          
  B500C -R 500  
—     
        
  B500CWR        
          
           
  B300D -R 
300  —      
          
  
B300DWR      
17 b   
         
          
 
D B350DWR  350   
1,25   
8       
    
1,3 × ReH(min.)    
 
B400DWR  400     
        
  B420DWR  420     16 b   
  B500DWR  500     13 b   
a By agreement between the manufacturer and purchaser, the type of elongation shall be selected between A5 and Agt. If the type of   
elongation is not specified by agreement, Agt should be used.   b
 In the case of the bars with diameter 32 mm or more in ductility class D, the minimum specified characteristic value for A may be 
decreased by 2 % for each 3 mm increase in diameter. However, the maximum diminution from the minimum specified characteristic 
value stated in Table 6 is limited to 4 %.    
 By agreement between the manufacturer and purchaser, the values shown in Table 6 may be used 
as specified minimum and/or maximum values.   
If a yield phenomenon is not present, the 0,2 % proof strength (Rp0,2) shall be determined.  
 
8.2 Bending properties  
 
If required by the purchaser, the bend test shall be performed in accordance with 9.2. After testing, 
the bars shall show neither rupture nor cracks visible to a person of normal or corrected vision.  
 
8.3 Rebending properties after ageing  
 
Regarding fifteen steel grades of B400A -R, B400B -R, B400C -R, B400AWR, B400BWR, B400CWR, 
B400DWR, B420DWR, B500A -R, B500B -R, B500C -R, B500AWR, B500BWR, B500CWR and 
B500DWR, if required, the rebend test shall be performed in accordance with 9.3.  
 
NOTE  The rebend test is used to verify the ageing properties of the bent bars.  
 
After testing, the bars shall show neither r upture nor cracks visible to a person of normal or corrected 
vision.  
 
8.4 Fatigue properties  
 
If required by the purchaser, the manufacturer shall demonstrate the fatigue properties of the product 
based on axial -force -controlled fatigue testing in the fluctuat ing tension range in accordance with 9.4.   
The specified number(s) of stress cycles, stress range(s) 2 σa and maximum stress(es) σmax shall be 
as agreed between the purchaser and manufacturer at the time of enquiry and order.  
 
 
9 Testing  
 
9.1 Tensile test  
 
The tensile test shall be carried out in accordance with ISO 15630 -1.  
For the determination of percentage  elongation after fracture, A5, the original gauge length shall be 5 
times the nominal diameter.   
For the determination of percentage total elongation at maximum force, Agt, equidistant marks shall 
be made on the free length of the test piece. The distance  between the marks shall be 20 mm, 10 mm 
or 5 mm, depending on the bar diameter.  
 
For determination of tensile properties, the nominal cross -sectional area of the bar shall be used.  
 
9.2 Bend test  
 
The bend test shall be carried out in accordance with ISO 1563 0-1. 
 
The test piece shall be bent to an angle between 160° and 180° over a mandrel of the diameter 
specified in Table 7.  
 
 
 
 
 
   
  
 
 
 
 
 
 
 
 
 
Table 7 — Mandrel diameter to be used for the bend test  
 
 Dimensions in millimetres  
  
Nominal diameter  Mandrel diame ter 
d (max.) a, b 
u 16 3d 
16 d u 32 6d 
32 d u 50 7d a For nominal diameters larger than 50 mm, the mandrel diameter in bend tests shall be agreed between the   
manufacturer and purchaser.  
b By agreement between the manufacturer and purchaser, larger mandrel diameters may be used.  
 
 
9.3 Rebend test  
 
The rebend test shall be carried out in accordance with ISO 15630 -1. The test piece shall be bent 
over a mandrel of the diameter specified in Table 8.  
 
The angle of bend before heating (ageing) shall be at least 90°, and the angle of reben d shall be at 
least 20°. Both angles shall be measured before unloading.  
 
Table 8 — Mandrel diameter to be used for the rebend test  
 
  Dimensions in millimetres  
   
 Nominal diameter  Mandrel diameter  
 d (max.) a, b 
 u 16 5d 
 16 d u 25 8d 
 25 d u 50 10d 
a For nominal diameters larger than 50 mm, the mandrel diameter in rebend tests shall be agreed between  
the manufacturer and purchaser.   
b By agreement between the manufacturer and purchaser, larger mandrel diameters may be u sed. 
   
 
9.4 Fatigue test  
 
The fatigue test shall be carried out according to ISO 15630 -1. 
 
9.5 Chemical composition  
 
In general, the chemical composition is determined by spectrometric methods.  
 
   
 10 Designation  
 
Ribbed bars according to this part of East Africa  Draft Standard  shall be designated in the following 
order:  
 
a) reinforcing steel;  denoted (B)  
 
b) a reference to this part of East Africa Draft Standard  (e.i CD/TZ/5:2016 ); 
 
c) the nominal diameter, in millimetres, according to Table 2;  
 
d) the steel grade.  
 
 
EXAMPLE  Reinforcing steel DEAS 412 -2 – 12 B500CWR  
 
 
  
11 Marking  
 
11 Marking  
 
Each bar and each bundle shall be legibly and indelibly marked as follows;  
 
Each  bar shall be marked 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 number  
Special orders bars in addition to the above marking shall bear the marking SP  
 
 
 
12 Evaluation of conformity  
 
12.1 General  
 
Certification and inspection of reinforcement shall be performed  
 
a) in accordance with a certification scheme monitored by an external body, or  
 
b) according to testing of a specific delivery.  
 
12.2 Certification scheme  
 
In the case of a certification scheme, e valuation of conformity shall be performed in accordance with 
ISO 10144.  
 
12.3 Acceptance testing of a specific delivery  
 
12.3.1 General  
 
Provisions regarding the nature, extent and evaluation of acceptance testing on deliveries of 
reinforcing steel not su bject to a certification scheme are given in 12.3.2 and 12.3.3.  
 
Acceptance testing of a specific delivery shall be performed according to 12.3.2.  
   
 By agreement between the manufacturer and purchaser, 12.3.3 may be used.  
 
 
 
12.3.2 Evaluation of characteris tic values  
 
12.3.2.1  Organization  
 
The tests shall be organized and carried out according to an agreement between the purchaser and 
manufacturer, taking into consideration the national rules of the receiving country.  
 
 
12.3.2.2  Extent of sampling and testing  
 
For the purpos e 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 steel grade and the same 
nominal diameter from the same cast. The manufacturer shall con firm in the test report that all 
samples in the test unit originate from the same cast. The chemical composition (cast analysis) shall 
be stated in this test report.  
 
Test pieces shall be taken from each test unit as follows:  
 
a) two test pieces from various bars for testing the chemical composition (product analysis);  
 
 
 
 
b) a minimum of 15 test pieces (if appropriate, 60 test pieces, see 12.3.2.3.1) from various bars for 
testing all other properties specified in this part of East Africa Draft Standard (DEAS 412 -2.) 
 
12.3.2.3  Evaluation of the results  
 
12.3.2.3.1  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 corresponds to the requirements, if the condition stated below is fulfilled for all properties:   
m15−2,33×  s15Wfk (2) 
where       
fk   is the required characteristic value;   
2,33  is the value  for the acceptability index, k, for n = 15 for a failure rate of 5 % ( p = 0,95) at a probability  
   of 90 % (1 – α = 0,90).  
 
 
    
 
s =  x i− m152 
(3) 
15   14  
    
If the condition stated above is not fulfilled, the index   
k ′ =  m
15 −f
k  (4) 
  
   s
15  
is determined from the test results available. Where k′W 2, testing can be continued. In this case, 45 
further test pieces shall be taken and tested from different bars in the test unit, so that a total of 60 
test results are available ( n = 60).  
 
 
 
The test unit shall be considered to comply with the requirements, if the condition stated below is 
fulfilled for all properties:   
m 60−1,93×  s 60>fk (5) 
 
where 1,93 is the value for the acceptability index, k, for n = 60 for a failure rate of 5 % ( p = 0,95) at a 
probability of 90 % (1 – α = 0,90).  
 
 
12.3.2.3.2  Inspection by attributes  
 
When testing properties are specified as maximum or minimum values, all results determined on the 
15 test pieces shall comply with the requirements of this part of East A frica Draft Standard 5. In this 
case, the test unit shall be considered to comply with the requirements.  
 
The tests may be continued when at most 2 results not conforming to the conditions occur. In this 
case, 45 additional test pieces from various bars 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 not more than 2 of the 60 
results do not conform to the conditions.  
 
 
12.3.2.3.3  Chemical composition  
 
Both test pieces shall c omply with the requirements in this part of East Africa Draft Standard . 
 
12.3.3 Evaluation of specified minimum/maximum values  
 
Tests shall be carried out according to the following.  
 
a) Bars of the same cast shall constitute one group. For every 50 t or frac tion thereof, one tensile 
test and one bend/rebend test shall be carried out for each bar diameter.  
 
b) Each individual test result shall meet the required values in Table 6, and the required 
bending/rebending properties in 8.2 and 8.3.  
 
c) One cast analysis shall be carried out for every cast to verify chemical composition (Clause 7). 
Samples shall be taken in accordance with ISO 14284 . 
 
d) If any test result does not meet the requirements, retests may be carried out, according to ISO 
404. 
   
 e) The manufacturer shall submit a test report stating that the products of the delivery satisfy the 
chemical and mechanical properties defined in Clauses 7 and 8, and a confirmation that the other 
requirements of this part of East Africa Draft Standard  are fulf illed. 
 
12.3.4 Test report  
 
The test report shall contain the following information:  
 
designation of the reinforcing steel in accordance with this part of East Africa Draft Standard  
 
a) marking on the reinforcing steel;  
 
b) date of testing;  
 
c) mass of the test uni t; 
 
d) test results.