ISBN 978-0-626-25730-9 SANS 920:2011 Eaition 2.3 SOUTH AFRICAN NATIONAL STANDARD Steel bars for concrete reinforcement Published by SABS Standards Division 4 Dr Lategan Road Groenkloof 5 Private Bag X191 Pretoria 0001 kop ie ay Tel: +27 12 428 7941 Fax: +27 12.944 1568 www.sabs.co.za © SABSSANS 920:2011 Edition 2.3 Table of changes Change No.[ Date Scope Amdt 4 1994 [Amended to incorporate cold-reduced steel bars and to make editorial corrections. Amdt 2, 2005) Amended to change the designation of SABS standards to SANS. standards, to update the definition of “acceptable” and, referenced standards, to replace the formula for the calculation lof the rib area in the test for deformed bars (5.6.1.4), to add a note to 5.6.2.4, to delete reference to the standardization mark and to add a bibliography. Amdt 3 2011 [Amended to update referenced standards Foreword This South African standard was approved by National Committee SABS SC 59A, Construction standards ~ Cement, lime and concrete, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This document was published in February 2011 This document supersedes SANS 920:2005 (edition 2.2), A vertical line in the margin shows where the text has been technically modified by amendment No. 3.Contents Foreword 1 Scope seen 2 Definitions... 3. Requirements 4 Marking 5 Inspection and methods of test 5.1 Inspection - 5.2. Dimensions and mass per metre 5.3. Tensile test 5.4 Bending test . 5.5 Rebending test 5.6 Test for deformed bars .. Appendix A Applicable standards Appendix B Notes to purchasers Appendix C Cross-sectional area and nominal mass per metre of steel bars Appendix D Weldability of steel bars Appendix E Chemical composition of steel bars Appendix F Quality evaluation of steel bars produced to the requirements laid ‘down in the specification Appendix G Cold-reduced steel bars Bibliography SANS 920:2011 Edition 2.3 “Amat 4 ‘Amat 2 Page 4 4 15 18 16 6 "7 18SANS 920:2011 Edition 2.3 This page is intentionally left blankSANS 920:2011 Edition 2.3 Steel bars for concrete reinforcement 1 Scope 4.1 This specification covers the physical and mechanical requirements for carbon steel! bars intended for use as reinforcement for concrete 4.2 It does not cover any surface treatment of the steel bars. NOTE a) The attention of users of steel bars for concrete reinforcement is drawn to the following standards: SANS 282, SANS 1200 G, SANS 10100-1, SANS 10100-2 and SANS 10144, ») The standards referred to in the specication ae listed in appencix A. ) Requirements that must be specified by the purchaser are listed in appendix B «) Values for tho cross-sectional area and the nominal mass per metre of ste! bars are given in eppendixC. ©) Details onthe weldabilty of ste! bars are given in appendix D. 1). Atest that may be used to determine the chemical composition of steel bars is given in appendix E. 19) Guidance on the verification of the quality of ste! bars for-concrete reinforcement produced to this specification is given in appendix F. hh) Requirements for cold-reducod steel bars are given in appendix G, Amat 1 2 Definitions For the purposes of this specification, the following definitions and the definitions of other relevant terms given in SANS 6892-1 shall apply: Amat 4; amat 3 acceptable ‘acceptable to the authority administering this standard, or to the parties concluding the purchase contract, as relevant ‘Amdt 4; amdt 2 bar a steel product of plain round or deformed cross-section, as rolled, including @ rod, a coil and a portion cut from a coil batch mass the mass, as stated by the manufacturer, of bars of the same type, nominal size and cast number, delivered at any one timeSANS 920:2011 Edition 2.3 bundle bars of the same type, nominal size and cast number, bound together for delivery purposes characteristic strength the specified value of the yield stress or, when this cannot be identified, the proof stress below which not more than 5 % of the results of the tests on a batch of reinforcing steel bers fall coil ‘one continuous as-rolled bar in the form of a coil cold-worked bar a bar that has been so twisted (or otherwise worked) at atmospheric temperature as to increase its yield stress. deformed bar a bar whose surface has been so shaped that the bar complies with the requirements for deformed bars given in 3.9. Ammat 1 longitudinal rib ‘uniform continuous rib that is parallel to the axis of the bar (In the case of a twisted bar, a uniform continuous rib that was parallel to the axis of the bar before the bar was twisted.) nominal size ‘the nominal diameter of a plain bar or, in the case of a deformed bar, the diameter of a circle of area ‘equal to the equivalent cross-sectional area of the bar, calculated as follows": 2 k Equivalent cross-sectional area, mm® = —__K__ eae 0007 857 where K = mass, kg L_ = length (of a bar of length at least 0,5 m), m both K and L being measured to an accuracy of at least 0,5 %. proof stress Re the nominal stress that produces a non-proportional elongation equal to a specified percentage of the extensometer gauge length, as deduced from a load-extension diagram or a stress-strain diagram (see figure 1) 1) Based on a stee! density of 7 850 kom’ 4SANS 920:2011 Edition 2.3 Stress Specified non-proportional elongation, percentage Strain ——— Drs test Figure 1 — Determination of proof stress Rr transverse rib any rib other than a longitudinal rib, on the surface of the bar yield stress the tensile stress at which elongation of a test piece initially increases without increase of load 3 Requirements 3.1 General ‘The steel shall have been made by the open hearth (acid or basic) process, the electric process or the basic oxygen process, and the bars shall be a) hot-olled mild steo! bars of plain round cross-section; b) hot-rolled mild steel deformed bars, cold-worked to increase yield stress; ‘Amat c) hot-rolled high yield stress steel deformed bars; or Amat 1 4) hot-rolled mild steel! bars of plain round cross-section, deformed and cold-reduced to increase yield stress. ‘Amdt 1 3.2 Finish a) The bars shall be well and cleanly rolled. b) Rust, seams, surface irregularities and mill scale shall not be cause for rejection, provided that the mass per metre, dimensions, cross-sectional area and tensile properties of a test specimen comply with the applicable requirements of this specification. NOTE It necessary, the test specimen may be brushed by hand with a wire brush, prior to testing. 3.3 Nominal size The nominal size of a bar, determined in accordance with 5.2, shall be one of the following: 6; 8; 10; 12; 16; 20; 25; 32 or 40 mm.SANS 920:2011 Edition 2.3 3.4 Length When bars of a specific length are required, the actual length, determined in accordance with 5.2, shall be at least equal to the specified value and shall not exceed that value by more than 50 mm. 3.5 Mass a) The mass per metre of a bar, determined in accordance with 5.2, shall not differ from the nominal value by more than the appropriate tolerance given in column 2 of table 1 b) In addition, the actual batch mass of a consignment of bars shall be equal to the value stated in the relevant consignment document(s) subject, except in the case of a coll”, to the appropriate tolerance given in colurnn 3 of table 1 Table 1 — Tolerances on mass 7 z ; Nominal size Tolerance %, max. On mass per metre of | on pa ae individual bars* (On batch mass a 28 +6 “4 3:10 Za cS 35 2 and over oA oe * The nominal mass per metre is calculated from the nominal size and a stee! density of 7 850 kg/m" 3.6 Pitch (cold-twisted bars) in the case of cold-twisted bars, the pitch, determined in accordance with 5.2, of one complete twist through 360° shall be not less than 8 times and not more than 12 times the nominal size of the bar. 3,7 Tensile properties ‘When a bar is tested in accordance with 5.3, a) the characteristic strength and elongation of the steel shall be at least as given in columns 3 and b) © 4oftable 2; * ) the ultimate tensile strength of the bar shall be at least 15 % greater than the yield stress or 0,20 % proof stress, as relevant, determined in the tensile test; and ) in the case of a mild steel bar, the yield stress of the bar shall not exceed 400 MPa. 2) When reinforcing steel is supplied in the form of a coil, the nominal mass of the coil, as stated by the 6 manufacturer, is, in practice, taken to represent the actual mass ofthe colSANS 920:2011 Edition 2.3 Table 2— Tensile properties 1 2 a 4 7 Elongation (on gauge type of see! |Nominal size d] Characteristic strenath | sso of seev/a*) mm MPa, min 96, min, Mi Allsizes 250 22. High viele ‘Allsizes 450. 14 ‘A_= Equivalent cross-sectional area 3.8 Resistance to cold bending 3.8.1 Bending When tested in accordance with 5.4, a bar shall withstand, without transverse rupture of the surface of the metal, being bent through an angle of 180° round a mandrel of the appropriate diameter given in column 3 of table 3. Table 3 —_Mandrel size 1 2 3 ‘Nominal sizo of bar d | Diameter of mandrel Type of steel Mild Allsizes 2d High yield All sizes ad 3.8.2 Rebending When tested in accordance with §.5, a bar shall withstand, without fracture, a) being bent through an angle of 45° round a mandrel of twice the nominal size of the bar in the case of a mild steel bar and five times the nominal size of the bar in the case of a high yield stress steel bar; and then ) being bent back (partially restraightened) by a steadily applied force through an angle of at least 23°. 3.9 Deformed bars A bar shall be deemed to be deformed if it complies with either (a) or (b) below. a) Geometrical properties. When measured in accordance with 5.6.1, @ bar shall have two or more rows of transverse ribs as shown in figure 2, with a substantially uniform spacing of not more than 0,8 d, where d is the nominal size of the bar. The included angle of the transverse rib at the longitudinal axis of the bar shall be at least 45°. The mean area of ribs (per unit length of bar) above the core of the bar projected on a plane normal to the axis of the bar shall be at least 0,15 d mm‘imm. Amdt 1 NOTE A bar may have continuous helical ribs in addition to the transverse ribs. b) Resistance to pull-out. When a bar is tested in accordance with 5.6.2, the average free-end slip of the bar shall not exceed 0,2 mm.SANS 920:2011 Edition 2.3 4 Marking 4.1 Bars In the case of hot-olled high yield steel bars, each bar shall bear a pair of longitudinal stripes rolled info the bar at intervals not exceeding 1,5 m, (if transverse ribs intersect these stripes, the ribs may be discontinued at the point of intersection.) 4.2 Bundles Each bundle or coil dispatched from the rolling mills shall have securely attached to it a metal label that bears the following information: 2) the manufacturer's name or trade name or trade mark; b) the type, cast number and nominal size of the bar(s); ©) the number or mass of bar(s) in the bundle or coil, as relevant; ) when relevant, an indication that the steel was made by the basic oxygen process. 5 Inspection and methods of test 5.1 Inspection After establishing compliance with the requirements of 3.5(b) and 4.2, inspect each bar in the ‘sample for compliance with the requirements of 3.2 and, when applicable, 4.1 5.2 Dimensions and mass per metre Using any method that will give the required accuracy, measure, to the nearest 0,1 mm, the dimensions of each bar in the sample and check for compliance with the requirements of 3.3 and, when relevant, 3.6. Then, by weighing each bar to an accuracy of at least 0,5 % and measuring its length to the nearest 5 mm, check for compliance with the requirements of 3.5(a) and, when relevant, 3.4 5.3 Tensile test 5.3.1 Test specimens From each bar under test, cut three specimens of the appropriate gauge length (see table 2) NOTE In the case of tests on deformed bars, use specimens in the as-olled condition (ie. without machining) 5.3.2 Procedure Use the relevant methods given in SANS 6892-1, and use the average results to assess ‘compliance with the relevant requirements of 3.7. Amat 4; amat 3SANS 920:2011 Edition 2.3 5.4 Bending test 5.4.1 Apparatus An apparatus that ensures a) continuous and uniform application of force throughout the bending operation; ) unrestricted movement of the specimen at points of contact with the apparatus, e.g. by using an aluminium sheet insert, with a maximum thickness of 6 mm, for tests on deformed bars; ©) close wrapping, during bending, of the specimen round @ mandrel of the appropriate size (600 38.1). 5.4.2 Test specimens From each bar under test, cut a specimen of length great enough to ensure free bending, 5.4.3 Procedure Ensure that the temperature of the specimen is within the range 10-30 °C. Place the specimen in the apparatus and bend it through 180°, then remove it and examine the bend for transverse rupture of the surface. 5.5 Rebending test 5.5.1 Apparatus Use the apparatus described in 6.4.1 and a mandrel of appropriate size (see 3.8.2(a)) 5.5.2 Test specimens Cut test specimens (see 5.4.2) from bars other than those from which specimens were cut for the test described in 5.4.3, 5.5.3 Procedure Ensure that the temperature of the specimen is within the range 10-30 °C. Place the specimen in the apparatus and bend it through an angle of 45°, then remove the specimen from the apparatus and immerse it in boiling water for at least 30 min. Remove the specimen from the water and allow it to cool to a temperature in the range 10-30 °C. Place the bent specimen in the apparatus and, using uniformly applied force, bend it back through an angle of at least 23°, and examine the specimen for signs of fracture. 5.6 Test for deformed bars 5.6.1 Geometrical properties 5.6.1.1 Apparatus ‘A measuring device that is capable of measuring to an accuracy of 0,02 mm, or better.SANS 920:2011 Edition 2.3 5.6.1.2 Test length The length, measured parallel to the axis of the bar under test, between the centres of two transverse ribs (on the same side of the bar) that are separated by at least 10 d, where d is the nominal size of the bar. 5.6.1.3 Procedure 1a) Measure the included angle (see figure 2) and the average height of the transverse ribs in the test length of the bar. NOTE For the height, take the average of the measurements from the centre end quarter points of tho ‘overall langth of each transverse rib (see figure 2) b) Determine the average spacing of the transverse ribs by dividing the test length by the number of spaces between the transverse ribs on one side of the test length 5.6.1.4 Recommended formulae for calculating projected rib area ‘Amat 1; amat 2 ‘The projected rib area R, in millimetres squared per millimetre length of bar, should be calculated for ribbed bars using one of the following equations’ a) for as-rolled deformed bars: = n LAO er b) for cold twisted bars: Lnsin By, R=n¢ oe) ‘Amat 4; amet 2 where 1 is the number of rows of transverse ribs (see note 1); 1 is the length of the transverse rib, in millimetres (see note 2); ‘his the height of the transverse rib, in millimetres (see note 3); is the angle between the centre line of the transverse rib and the bar axis, in degrees; cis thé centre to centre spacing between transverse ribs, in millimetres (see note 4): Nis the number of longitudinal ribs; ‘hy is the height of the longitudinal rib, in millimetres (see note 5) @ isthe nominal bar size, in millimetres; p_ isthe pitch of twist measured parallel to the bar axis, in millimetres (see note 6). ‘Amat 1; amat 2 NOTE 1 If more than one pattern of transverse ribs exists, e.g. alternate ribs are set at different angles, or there are different rib patterns in each row, the term containing n should be calculated for each different set of ribs, and the summation of the values obtained, ‘Amdt 1; amdt 2 40SANS 920:2011 Edition 2.3 NOTE 2 The length of the transverse rib is measured at the rib-to-core interface. The length should be determined as the average of three measurements on each row or of a set of transverse ribs. Amdt 1; amdt 2 NOTE 3. The height of the transverse rib is measured perpendicular to the core of the bar. The height should be determined as the average of three measurements on each row or of a set of transverse ribs. (Using ‘Simpson's rule for approximation under a curve, with rib height measurements at the midpoint and quarter point, the ib height for each rib profile may be established as a proportion ofits midpoint height. For transverse ‘ibs of parabolic profil, the rib height should be taken as two thirds of the midpoint height.) Amdt 4; amdt 2 NOTE 4 The centro-to-centre spacing between transverse ribs is determined by dividing the distance, measured parallel to the axis of the bar, between the midpoints of two ribs, of about ten ribs apart, by the umber of rib spaces in between. For twisted bars, the rib spaces should be counted in a helical fashion, Amat 1; amdt 2 NOTE 5 The height of the longitudinal rib is determined as the average of three measurements on each rib. ‘Amat 1, amat 2 NOTE 6 The pitch of twist measured parallel to the bar axis is determined as the average of three measurements, ‘Amat 1; amat 2 Included angle —— | of rib b= mean height of rib View on arrow X Figure 2— Transverse ribs on deformed bars 5.6.2 Pull-out test 5.6.2.1 Apparatus a) Testing machine, A machine that is capable of applying the required tensile force (see 5.6.2.4(d) below) with an accuracy of 1 % and that 4) is so rigidly constructed that its structural components (members) are at no time subjected to a tensile force greater than half of that applied to the test specimen; "1SANS 920:2011 Edition 2.3 2) has an upper cross-head with a central hole of diameter at least 50mm, and that is large enough to support a spherically seated platen and seat with a central hole of the same diameter; and 3) is So equipped with a device (fixed to the lower cross-head) for gripping the end of a steel bar that no lateral forces are applied to the bar when the test prism (seo 5.6.2.3 below) is in position in the test machine (see 5.6.2.4(b) and (c) below). b) Concrete moulds. Use moulds that are suitable for the casting, as described in 56.2.3 below, of concrete prisms that conform to the relevant dimensions given in table 4 Table 4 — Dimensions of concrete test prisms 1 2 3 Nominal size of bar | Length of prism | Cross-section of prism om mm mm 6 95 750 « 160 8 130 150 * 150 10 160 150 * 150 2 195 480 « 150 16 255 150 * 150 20 320 150 « 150 25 400, "250 x 250 32 510 250 x 260 40 840. 250 x 250 c) Measuring device. A measuring device capable of measuring a slip in the test specimen to the nearest 0,02 mm. 4) Steel yoke. A steel yoke for attaching the measuring device to the test prism, ©) Helical reinforcement. Helical reinforcement of plain round mild steel bar of diameter 6 mm and at 25 mm pitch, with an outside diameter of the helix 10 mm less than the internal length of the side of the mould, {) Steel plate. A mild steel plate, of nominal thickness 12 mm and of superficial size at least equal to that of the square end of the appropriate test prism, and that has a central hole of diameter not, more than 2 mm greater than thal of the specimen under test. 9) Packing. A packing of nominal thickness 10 mm, of shape similar to that of the steel plate (including the central hole) and made of an insulation board that complies with the relevant requirements of SANS 540, 5.6.2.2 Test specimens From each of six of the bars under test, cut a specimen that is long enough to be cast in a prism as described in §.6.2.3 below. 12SANS 920:2011 Edition 2.3 5.6.2.3 Preparation of test prisms a) After ensuring that the condition of the surfaces of all the test specimens is similar (see note to '3.2(b)), 80 place each test specimen vertically in the centre of a mould of the appropriate size (see table 4) that 1) one end of the specimen protrudes approximately 10 mm beyond the bottom of the mould; 2) the specimen and the mould are co-axial; and 3) the other end of the specimen extends far enough beyond the top of the mould as to allow it to be gripped in the testing machine (see 5.6.2.4 below), b) Insert the helical reinforcement and fill (through the top) each mould with concrete, so compacting the concrete as to minimize the occurrence of voids. Ensure that all six test prisms are of the same mix, age and compaction. ©) Prepare also in accordance with the method given in SANS 5863 six cubes of concrete without reinforcement but of the same mix, age and compaction as the six test prisms, 4) Cure all concrete prepared as in (b) and (c) above in accordance with the method for site-made test specimens given in SANS 5863. 5.6.2.4 Procedure a) Determine, at least 14d and not more than 28 d after casting, and in accordance with the procedure given in SANS 5863, the compressive strength of the concrete cubes. Apply the results as follows. 1) Ifthe average compressive strength is greater than 45 MPa, repeat the test in its entirety; and 2) if any result is less than 40 MPa, cure the remaining cubes and prisms for a further period and then test three cubes for compressive strength. If any result is less than 40 MPa, or if the average of the three results is greater than 45 MPa, repeat the test in its entirety. NOTE Experience has shown that it is not feasible to predict how long it might take for the cubes to reach the required strength ‘Amdt 2 b) When test prisms of the required strength have been obtained, Le. when the average compressive strength of the three cubes is not greater than 45 MPa, with no result being less. than 40 MPa, place the mild stee! plate on the spherically seated platen that is situated on the Upper cross-head of the testing machine, and superimpose the packing on the steel plate ¢) So mount each test prism (in turn) on the packing that the 10 mm protrusion of the:specimen is uppermost and that the other end passes through the holes in the packing, the steel plate, the spherically seated platen and its seal, and the upper cross-head, and is gripped in the lower cross-head of the testing machine. So secure the measuring device and yoke on the upper surface of the test prism that the measuring device records the relative slip between the upper (free) end of the specimen and the test prism. 4) Apply a suitable initial tensile force to the test assembly and increase the force steadily over a period of approximately 2 min, until the stress in the specimen attains the characteristic strength (see table 2) of the steel from which the bars are made. Hold the force constant for a further 2 min and then record the extent of the free-end slip of the specimen. Calculate the average free- tend slip of the six specimens, and check for compliance with the requirement of 3.9(b) 13SANS 920:2011 Edition 2.3 Appendix A Applicable standards (This appendix does not form par of the requirements of the specification) Amat 1 ‘Amat t Reference is made to the latest issues of the following standards: ‘SANS 282, Bending dimensions and scheduling of stee! reinforcement for concrete, SANS 540-1, Fibroboard products ~ Part 1: Uncoated fibreboard. Amat? SANS 540-2, Fibreboard products ~ Parl 2: Cualed fibreboard. Amat 2 SANS 1200 G, Standardized specification for civil engineering construction - Section G: Concrete (structural) SANS 5863, Concrete tests ~ Compressive strength of hardened concrete. SANS 6892-1/ISO 6892-1, Metallic materials — Tensile testing ~ Part 1: Method of test al room temperature. Amdt; amat 3 ‘SANS 9001/ISO 9001, Quality management systems — Requirements. Amdt2 SANS 1010-1 (SABS 0100-1), The structural use of concrete ~ Part 1: Design. SANS 1010-2 (SABS 0100-2), The structural use of concrete ~ Part 2: Materials and execution of work. SANS 10144 (SABS 0144), Detailing of ste! reinforcement for concrete Appendix B Notes to purchasers (Tis appendix does not form part ofthe requirements of the specification) Amdt 4 The following requirements éhall be specified in tender invitations and in each order or contract a) The type (see 3.1); b) The nominal size (see 3.3); c) When relevant, the length (see 3.4); d) When relevant, that the steel is to be supplied in the form of a coil (see 3.5), 44SANS 920:2011 Edition 2.3 Appendix C Cross-sectional area and nominal mass per metre of steel bars (This appendix does not form part of the requirements of the specification) Amdt 4 i z 3 Sie ofbar | Crosesectional area | Nominal mass mm mm? kg/m 6 283 0222 3 503 0306 10 78 ost? 2 7 0.888 ie m1 38 20 at Bar 25 1 385 @ 04 eat * 1280 886 Appendix D Weldability of steel bars (This appendix does not form part of the requirement of the specification) Amdt 4 D.1 Mild steel ‘A mild steel bar that complies with the applicable requirements of this specification may be considered capable of being welded, provided that the correct welding procedures are followed. D.2 High yield stress steel A high yield stress steel bar may only be considered capable of being welded if the carbon equivalent (CE) value does not exceed 0,51 %, where Mn, Cr+Mo+V | Ni+Cu CE %(m/m) = C + 5 SEEEOEE (mum) = 6 + : ie ‘and C= carbon content, % (m/m) Mn = manganese content, % (rm/m) Cr = chromium content, % (m/m) Mo = molybdenum content, % (m/m) V_ = vanadium content, % (m/m) Ni = nickel content, % (m/m) Cu = copper content, % (m/) as determined by means of ladle analysis. 15SANS 920:2011 Edition 2.3 Appendix E Chemical composition of steel bars E.1 The chemical composition, as determined by means of ladle analysis, of the steel should comply with the appropriate requirements given in table E.1. If a purchaser requires tests for chemical composition, those given in E.2 are recommended. It should be borne in mind that chemical composition as determined on the finished steel bar can vary slightly from the ladle analysis. Table E.1 — Chemical composition 4 2 3 High yield stress Element Ad steel steel Ye, max. %, max. Carbon 0.30) 0.50 Sulphur 0.06 0.08 Phosphorus 0,06 0,05 Nitrogen 0,008" - * “Applicable only to ste! made by the basic oxygen process, E.2 To determine the chemical compositions of the steel use the relevant current methods published by ISO, ASTM or BSI. Appendix F Quality evaluation of steel bars produced to the requirements laid down in the specification (This appendix does not form part of the requirements of the specification) Amdt 4 When a purchaser requires quality verification on an ongoing basis of steel bars produced to this specification, it is suggested that, rather than to the evaluation of the final product only, he also Jirect his attention to the quality management system applied by the manufacturer. In this connection it should be noted that SANS 9001 covers the provision of an integrated quality management system, ‘Amat 2 16‘SANS 920:2011 Edition 2.3 Appendix G Amdt 4 Cold-reduced steel bars Amdt 4 (This appendix forms part of the requirements of the specification) G.1 General Amat 4 Cold-reduced steel bars shall also comply with the relevant requirements of this specification. ‘Amdt 4 G.2 Tensile properties Amat 4 G.2.1 Requirements Amat + When a cold-reduced steel bar is tested in accordance with G.2.2, a) the tensile properties shall be as given in table G. 1; b) the ratio of the tensile strength to proof stress, Re/Rya2, for each test piece shall be at least 1,03; and ¢) by agreement between manufacturer and purchaser, the values in table G.1 may be used as Quaranteed minimum values. Amat t Table G.1 — Tensile properties Amat 4 1 2 3 Proofstress | Tensile strength Elongation Rooa, MPa Reo, MPA. Asse, % 500, 550. 12 * By agreement between the purchaser and the manufacturer, 2 total elongation (Ay) of 2,0 %, at maximum force, shall bo Used instead of Asis. Amat G.2.2 Tensile test Amdt Determine tensile properties in accordance with SANS 6892-1, Use an original gauge length of five times the nominal diameter, and ensure that the free distance between the grips is not less than 180 mm, ‘Amat 1; amat 3 For calculation of proof stress and tensile strength, use the nominal cross-sectional area of the bar. ‘Amat 1 G.3 Chemical composition Amat 1 ‘The chemical composition of the stee! shall comply with the appropriate recommendations given in appendix E. ‘Amdt 4 17SANS 920:2011 Edition 2.3 Bibliography Cement and Concrete Institute. 2001. Fulton's concrete technology (8th ed.). South Africa: Cement and Concrete Institute. ‘Amdt 2 snes 18oo ‘SABS - Standards Division ‘The objective of the SABS Standards Division is to develop, promote and maintain South African National Standards, This objective is incorporated in the Standards Act, 2008 (Act No. 8 of 2008). Amendments and Revisions South African National Standards are updated by amendment or revision. Users of South African National Standards should ensure that they possess the latest amendments or editions. The SABS continuously strives to improve the quality of its products and services and would therefore be grateful if anyone finding an inaccuracy or ambiguity while using this standard would inform the secretary of the technical committee responsible, the identity of which can be found in the foreword. 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