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JS33: 2013

amaican Standard

Specification

for

ot

rolled

s teel bar s for the reinfor cement of conc rete

BURE U OF ST ND RDS J M IC

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JS33: 2013

Contents

Page

Foreword

Committee representation

Acknowledgement

Related documents

Spec i f i ca t ion

S ec t io n o n e C o n s t r u c t i o n

1

Scope

1

2

Definitions

1

3

General Requirements

2

4

Chemical Composition

2

5

Requirements for deformations

4

6

Measurements for deformations

4

7

Tensile Properties

5

8

Verification of testing machine

6

9

Bending properties

6

10

Test specimens

7

11 Sampling and testing 8

12

Retests

8

13

Permissible deviatian in mass

9

14

Finish

9

15

Marking and identification

9

16

Manufacturers certificate 9

17 Inspection

10

18

Defects revealed after deliverv 10

Tab les

2

1 Deformed bar designation numbers, nominal dimensions, unit masses and deformation

requirements

limits for manufacturers heat analysis of grade 400 steel

limits for purchasers product analysis of grade 400 steel

Tensile requirements

Bend test requirements

2

3

3

5

7

3

4

5

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Foreword

JS33: 2013

This standard is a revision of LS

33: 2005.

In this standard the steel b ars ar e size d a cc ord ing t o t he ir

nom inal diam eter and the sizes are designated by a number in accordance w ith the actual bar diam eter in

millimetres.

C hanges to this standard include: the addition of three bar sizes 28 m m.

30

mm and

35

mm and the

revision ofaverage spacing and average height detailed in table I: the Iabelling m a rk in g o f t he r eb ars as

specified in C lause 16.

The grades are identified by their m inim um yield strengths expressed in M Pa. A m axim um yield strength

lim it h as b een ad op ted.

This standard is intended to be com pulsory.

Com mittee representation

The revision of LS

33: 2005

for the Standards C ouncil, established under the Standards Act 1968, was

carried out under the supervision of the M etallurgy an d B uild in g M aterials C om mittee, which at the tim e

co mp rised th e fo llo win g p erso ns:

M r N orm an H orne. C hairm an

M r T rev or M ck en zie, T ec hn ic al S ec re ta ry

M r Howard Chin

M r A nd rew S tan ig ar

M r Eladio W alker

M r H ora ce W iltsh ire

M r A llain R ob in so n

M r J ose ph P atte rs on

M r Ray D ixon

M r E rro l M cC arth y

M r E ric A nto nio

M r B rian M atth ew s

M r E arl C ro ok s

Ac knowledgment

A re System s Ltd.

A re System s Ltd.

Jam aica Institution of Engineers

S pe ctru m S yste ms

Q ua lity D ea lers

Q ua lity D ea lers

Q u al it y D ea le rs

S te wa rt s H ar dw are

S cie ntific R es ea rc h C ou nc il

E

&

R Hardware Ltd.

T an k-W eld M etals Ltd.

Matthews & C lark e L td.

E stac Industrial Agencies

Ackrowledgrnent

is n a de to t he fo llow in g in sti tu tio ns f o r pe rmi ssion to reprodu ce n aterial fro m th e

f o ll ow ing documen t s:

Ca n ad ia n S ta nda rd s A s so c ia ti on

I n te rna ti onalOrgan iz a ti on f o r S t anda rd i za ti on

S tr uc tu ra l E ngi ne er s A s so c ia ti on o fCa li fo rn ia SEAOC

Re la te d do cument s

T his s ta nd ard m a ke s re fe re nc e t o th e fo llow in g:

A ST M A 70 6/A706M

CSA G30.

2 -M

I SO 6935 -2

Rec om m en ded lateral forc e requirements an d

co nm en tary - 4

th

edition

ASTM E4 Vol. 03.01

AW S DI.4/D I.4M

CSA G30. 18

I SO 6935 -2

S ta nd ard S pe ci f ca tio n for L ow -A llo y S teel D efo rn ed an d P lain B ars fo r Concrete

Reinforcement

S t anda rd P r ac ti ces f or F or ce V eri f ca ti on o fT estin g Machines

S tru ctu ra l W e ld in g C o de - Reinforcing Steel

C ar bo n s te el b ars fo r c on cre te r ein fo re em e nt

S te el fo r th e rein fo ree men t o f c on cre te P art 2 : R ibb ed b a rs

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33: 2013

SEAOC Recommended lateral force requirements and commentary - San Francisco:

Seismology Committee, Structural Engineers Association ofCaliforni a, 1996

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commonly used include manganese, copper, nickel, chromium, molybdenum, vanadium, silicon,

columbium, titanium and zirconium.

4.2 The carbon equivalent shall be calculated using the chemical composition as shown in the

mill test report by the following formula:

C.E .

% C % Mn/6

% Cu/40

% NiJ20

% Cr/lO - %Mo/50 - % V/LO

i

where:

C.E. is the carbon equivalent

% C is the percentage carbon content

% Mn is the percentage manganese content

%Cu is the percentage copper content

% Ni is the percentage nickel content

% Cr is the percentage chromium content

% Mo is the percentage molybdenum content

% V is the percentage vanadium content.

4.2.1 For Grade 400 steel, in order to ensure adequate weldability, the heat analysis shall be

such as to provide a carbon equivalent not exceeding 0.55%.

The chemical composition as shown by the heat analysis shall be limited to the following

percentages:

Table 2: Limits for manuf

ac urer's heat analysis of grade 400 steel

Element Maximum

Carbon 0.30

Manganese

1.50

Phosph orous

0.035

Sulphur 0.045

Silicon

0.50

An analysis may be made by the purchaser from finished bars representing each heat of steel.

The chemical composition thus determined shall be limited to the following percentages:

Table 3: Limits for purcha

00er's product analvsis of grade 4

steel

Element

Maximum

Carbon

0.33

Manganese

1.56

Phosphorous

0.043

Sulphur

0.053

Silicon

0.55

4.2.2 For Grade 300 steel only, in order to ensure adequate weldability, the heat analysis shall

be such as to provide a carbon equivalent not exceeding 0.40. The carbon equivalent may be

calculated using the chemical composition as shown in the mill test report by the following

formula:

3

Comment [SS2]: Carbon

equiva1ent equation changed to

aligri with National Building Code

and ASTM Standard.

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C.E.

=

% C % Mn/6

The chemical composition as shown by the heat analysis shall be limited to a maximum of

0.05% phosphorus and 0.05% sulphur.

An analysis may be made by the purchaser from finished bars representing each heat of steel.

The phosphorus and sulphur content thus determined shall not exceed that specified above by

more than 25%.

5. Requirements for deformations

5.1 Deformations shall be spaced along the bar at substantially uniform distances. The

deformations on opposite sides of the bar shall be similar in size and shape.

5.2 The deformations shall be placed with respect to the axis of the bar so that the included angle

is not less than 45. Where the line of deformations forms an included angle with the axis of the

bar from 45 to 70 inclusive, the deformations shall alternately reverse in direction on each side,

or those on one side shall be reversed in direction from those on the opposite side. Where the line

of deformations is over 70, areversal in direction is not required.

5.3 The overall length of deformations shall be such that the gap between the extreme ends of the

deformations on opposite sides of the bar shall not exceed 12.5 of the nominal perimeter of the

bar. Where the ends terminate in a longitudinal rib, the width of the longitudinal rib shall be

considered the gap. Where more than two longitudinal ribs are involved, the total width of all

longitudinal ribs sh all not exceed 25% of the nominal perimeter of the bar. The nominal

perimeter of the bar shall be 3.14 (i.e. r) times the nominal diameter.

5.4 The spacing, height and gap of deformations shall conform to the requirements detailed in

table 1.

6. Measurements of deformations

6.1 The average spacing of deformations shall be determined by dividing a measured length of

the bar specimen by the number of individual deformations and fractional parts of deformations

on any one side of the bar specimen. A measured length of the bar specimen shall be considered

the distance from apoint on a deformation to a corresponding point on any other deformation on

the same side of the bar. Spacing measurements shall not be made over a bar area containing bar

marking symbols involving letters or numbers.

6.2 The average height of deformations shall be determined from measurements made on not less

than two typical deformations. Determinations shall be based on three measurements per

deformation, one at the centre of the overall length and the other two at the quarter points of the

overall length.

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6.3 Insuffcient height, insuffcient circumferential coverage, or excessive spacing of

deformations shall not constitute cause for rejection unless it has been c1early established by

determinations on each lot tested that typical deformation height, gap, or spacing do not conform

to the requirements detailed in table

.

No rejections shall be made on the basis of measurements

iffewer than ten adjacent deformations on each side of the bar are measured.

7 Tensile properties

7.1 The yield strength and elongation of the two grades ofsteel complying with this standard and

represented by the test specimens shall conform to the requirements detailed in table 2.

The actual yield strength based on mill tests shall not exceed the minimum specified by more

than

25 MPa. Subsequent tests shall not exceed this value by more than an additional 20 MPa.

The tensile strength of any bar shall be at least 25% greater than the actual yield strength

measured in the tensile test.

Table 4. Tensile requirements

Grade 300

Grade 400

Yield strength

300 MPa (min)

400 MPa (min)

Elongation 011 200 mm gauge lengh for

Percent (min) Percent (min)

bar designation numbers.

6,8.9.5. LO.12

9

15. 16, 19.20 12 9

25.28 LO 8

30. 32. 35, 40 LO 7

7.2 Where the steel tested has a sharp-kneed or well defined type of yield point, the yield point

shall be determined at the option of the manufacturer by one of the following methods:

(a) Drop of the beam or halt in the gauge of the testing machine.

Applyan increasing load to the specimen at a uniform rate.

Keep the beam in balance by running out the poise at approximately a steady rate, when alever

and poise machine is used.

When the yield point of the material is reached, the increase of the load will stop, but run the

poise a trifle beyond the balance position, and the beam of the machine will drop for a brief but

appreciable interval of time. When a machine equipped with a load-indicating dial is used, there

is a halt or hesitation of the load indicating pointer corresponding to the drop of the beam.

Note the load at the 'drop of the beam' or the 'halt of the pointer' and record the corresponding

stress as the yield point.

(b) Autographic diagramme method

When a sharp-kneed stress-strain diagramme is obtained by an autographic recording device, the

stress corresponding to the top of the knee or the point at which the curve drops shall be recorded

as the yield point.

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7.3 When testing material for yield point and the test speeimens may not exhibit a well-defined

disproportionate deformation that eharaeterizes a yield point as measured by the drop of the

beam, halt of the pointer, or autographie diagramme method, a value equivalent to the yield point

in its praetieal signifieanee may be determined by one of the following methods and may be

reeorded as yield point:

(a) extension under load using dividers with a 200-mm gauge length.

The extension under load sh all be 1.0 mm and shall be determined by seribing on the speeimen a

200-mm gauge length, pivoting from a priek puneh mark. The yield load shall be reeorded when

the total gauge length under load beeomes 20

mm as measured by the dividers.

(b) extensometer

Attaeh a class C or better extensometer (see NOTE) to the specimen. When the load producing

an extension of 0.005 mm/mm (0.5%) is reached, the stress corresponding to this load shall be

recorded as the yield point.

NOTE. Automatic devices are available that determine the load at the specifed total extension without

plotting a stress-strain curve. Such devices may be used if accuracy for each has been demonstrated.

Multiplying calipers and other such devices are acceptable for use provided that aecuracy has been

demonstrated as equivalent to a class C extensometer.

8 Veritication oftesting machine

8.1 The testing maehine used to deterrnine the properties specified in Clause 8 shall be verified at

least onee per year. The period of time elapsing between such verifications sh all not exceed 12

months.

8.2 The verifieation shall be eonducted bya source approved by the Bureau of Standards.

8.3 Where a testing machine has not been verified in aecordance with 9.1, or where such a

maehine does not meet the aeeuraey and reliability requirements of ASTM E4, the manufacturer

shall not certify any bars as conforming to the requirements of this standard.

9. Bending properties

9.1 Bend test requirements. The requirements for degree of bending and sizes of pins sh all be

as detailed in table 3.

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Table 5. Bend test requirements

Bar designation number Diameter of pin for bend tests

Grade 300 Grade 400

6.8.9.5.10.12.15,16

2d

4d

19.20 5d 5d

25.28 5d 6d

30 . 32. 35,40

5d 8d

where d nominal diarneter of specimen. Specimen is bent through 180.

9.2 Bend test procedures

9.2.

t

General

The bend test specimen shall stand being bent, when at ambient temperature but

in no case less than 16C, around a pin without cracking on the outside of the bent portion.

92 2 Apparatus The ben d shall be made on specimens of sufficient length to ensure free

bending and with apparatus which provide the following:

(a) continuous and uniform application of force throughout the duration of the bending

operation;

(b) unrestricted mavement of the specimen at points of contact with the apparatus and bending

around a pin free to rotate, or bending around a pin on a simple span with end supports free to

rotate;

(c) close wrapping of the specimen around the pin during the bending operation.

9 23 Other methods

Other methods of bend testing may be used, but failures due to such

methods shall not constitute abasis for rejection.

O.Test specimens

tO. Tension test specimens shall be of the full seetion of the bars as-rolled for sizes No. 6 to No.

32.

0.2 As an alternative to testing the full seetion of the bar as-rolled, tension test specimens for

bar sizes over No, 32 may, at the option of the manufacturer, be test ed by the reduced seetion

type of test indicated in

2, I.

10.2.1 Specimens shall be machined from the bar to a diameter of 28,65 mm (650 mrrr' cross-

section) over a length of not less than 225 mm, with fIlets at the ends of the turned-down seetion

having a radius of 13 mm and using a 200-mm gauge length. The reduced seetion may have a

gradual taper from the ends toward the centre, with the ends not more than 1% larger in diameter

than the centre (controlling dimension),

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1 3

The unit stress determinations on full size specimens shall be based on the nominal cross-

sectional areas shown in table 1. For reduced seetion specimens, the yield strength and tensile

strength results shall be corrected by the ratio of as-rolled bar mass to nominal bar mass.

1 4

The bend test specimens shall be the full seetion of the bar as-rolled.

i Sampling and testing

For the purpose of verifcation testing by the Bureau of Standards or other third party, the

delivery shall be sub-divided 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 heat or east.

2

One sample of suffcient length shall be taken from each test unit for the following tests:

(a) one tensile test

(b) one bend test

(c) dimensional verifcations

(d) chemical composition tests (product analysis)

13

When a test specimen develops a tlaw due to failure of the testing equipment or improper

specimen preparation, it shall be discarded, and another specimen of the same bar size and grade

and from the same heat or east shall be substituted.

2 Retests

2 Ifany tensile property ofany tension test specimen is less or greater than that specified, and

any part of the fracture is outside the middle third of the gauge length, as indicated by seribe

scratches marked on the specimen before testing, aretest shalI be allowed.

2 2 If the results ofan original tension specimen fail to meet the specifed requirements and are

within 14 MPa of the required tensile strength, within 7 MPa of the required yield point, or

within two percentage units of the required elongation, aretest shall be permitted on two random

specimens for each original tension specimen failure from the lot. If all results of these retest

specimens meet the specifed requirements, the lot shall be accepted.

2 3

If a bend test specimen fails for reasons other than mechanical failure or tlaws in the

specimen as deseribed in 13.4 and 13.5, aretest shall be permitted on two random specimens

from the same lot. The lot shall be accepted only if the results of both retest specimens meet the

specifed requirements. The retest shall be performed on specimens that are at air temperature

but not less than 16C.

12 4

Where a test specimen fails for mechanical reasons such as failure oftesting equipment or

improper specimen preparation, it shall be discarded and another specimen taken.

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12.5 When a test specimen develops a flaw due to failure of the testing equipment or improper

specimen preparation, and is discarded, another specimen of the same bar size and grade and

from the same heat or east shall be substituted.

13. Permissible deviation in mass

Permissible deviation in mass per unit length shall not exceed the limits detailed in table i.

14. Finish

14.1 The bars shall be free from detrimental surface imperfections.

14.2 Rust, seams, surface irregularities, or mill scale shall not be cause for rejection, provided the

mass, dimensions, cross-sectional area and tensile properties of a test specimen cleaned to base

metal by hand wire-brushing or other Ceaning method are not less than the requirements of this

standard.

14.3 Surface imperfections other than those specifed in 15.2 shall be considered detrimental

when specimens containing such imperfections fail to conform to either tensile or bending

requirements.

15. Marking and identification

15.1 Marking of bars. All bars produced to this specifcation, shall be identifed by a

distinguishing set of marks legibly rolled onto the surface of one side of the bar to denote in the

following order, such that each commercial length supplied by the manufacturer shall have at

least one such set of marks:

(a) point of origin - letter or symbol established as the producer's mill designation.

(b) size designation - number corresponding to the bar designation number in table i.

(c) grade ofsteel - number to identify the grade ofany bar. The manufacturer shall

use the following for:

. Grade 300 bars: 300

2. Grade 400 bars: 400

Adequate space should be allowed in-between each of these marks to permit easy differentiation.

If necessary, where the transverse ribs intersect the marks the ribs may be omitted.

15.2 Marking of bundles. Each bundle of bars shall have a durable tag stating the manufacturer,

the number of this Jamaican Standard (lS 33), the grade of steel, the nominal diameter, east or

heat number and country of origin.

16. Manufacturer's certificate

16.1 No bars intended for the reinforcement of concrete shall be dispatched from the

manufacturer's works until tested and certifed to comply with the requirements of this standard.

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16.2 The manufacturer 's certificate relating to each bundIe shall be traceable through the heat

number.

16.3 The manufacturer's certificate shall state the process of manufacture, the chemical

composition, the carbon equivalent and the mechanical properties (as specified in Clause 3,

Clause 4, Clause 8 and Clause

O) applicable to each heat from which the bars purchased is

derived.

16.4 The purchaser shall be provided with a copy of the manufacturer's certificate(s) for each

delivery of bars from the manufacturer's works. When the bars are purchased from a supplier, a

copy of the manufacturer's certificate shall be provided by the supplier on request.

16.5 The manufacturer shall retain records of the unit masses, chemical composition, carbon

equivalent and mechanical properties of the bars made from each heat of steel. These records

shall be capable of being identified with the relevant bundles said.

17. Inspection

An independent inspector approved by the Bureau of Standards shall have free entry to all parts

of the manufacturer's works that concern the manufacture of the material ordered at all times

while work on the contract of the purchaser is being performed. The manufacturer shall afford

the inspector all reasonable facilities to satisfy him that the material is being furrished in

accordance with this standard. All tests (except product analysis) and inspection shall be made at

the place of manufacture prior to shipment, unless otherwise specified, and shall be so conducted

as not to interfere unnecessari Iywith the operation of the works.

18. Defects revealed after delivery

18.1 Should any material after delivery be found not to be in accordance with this standard, such

material shall be deemed not to comply with this standard, notwithstanding any previous

acceptance, provided that it has not been improperly treated.

18.2 Samples tested that represent rejected material shall be preserved for two weeks from the

date the rejection s reported to the manufacturer. In case of dissatisfaction with the results of the

tests, the manufacturer may make claim for a re-hearing within that time.

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