IS 13620 : 1993(Reaffirmed 2000)

Edition 1.1(1994-04)

B U R E A U O F I N D I A N S T A N D A R D SMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

Price Group 4

© BIS 2003

Indian Standard

FUSION BONDED EPOXY COATED REINFORCING BARS — SPECIFICATION

(Incorporating Amendment No. 1)

UDC 669.14.018.26-422 : 621.793.7 ( 678.686 )

Cement and Concrete Sectional Committee, CED 2

FOREWORD

This Indian Standard was adopted by the Bureau of Indian Standards, after the draft finalized bythe Cement and Concrete Sectional Committee had been approved by the Civil EngineeringDivision Council.Corrosion of reinforcing bars in R.C.C. constructions, particularly those located in the salinecorrosion prone and industrially poluted area, is one of the major problems encountered by thestructural engineers in our country. Amongst the long term measures, one of the method forprotection of concrete reinforcing bars against corrosion is epoxy coating on these bars byelectrostatic spraying of fusion bonded epoxy powder. Therefore, keeping in view the country’sneed for appropriate corrosion resistance reinforcing bars, it was felt necessary to prepare thisstandard in order to help the users to procure epoxy coated reinforcing bars of accepted quality.The use of such bars is not recommended as a substitute for good construction practices includingadequate cover and other durability requirements specified in the relevant standard.While preparing this standard, considerable assistance has been derived from the following:

ASTM Designation : A 775/A 775 M-84 Standard specification for epoxy-coated reinforcing bars,American Society for Testing and Materials

ASTM Designation : D 3963-1986 Standard specification for epoxy-coated reinforcing barsAmerican Society for Testing and Materials

The composition of the technical committee responsible for the formulation of this standard isgiven in Annex B.This edition 1.1 incorporates Amendment No. 1 (April 1994). Side bar indicates modification of thetext as the result of incorporation of the amendment.For the purpose of deciding whether a particular requirement of this standard is complied with,the final value, observed or calculated, expressing the result of a test or analysis, shall be roundedoff in accordance with IS 2 : 1960 ‘Rules for rounding off numerical values ( revised )’. The numberof significant places retained in the rounded off value should be the same as that of the specifiedvalue in this standard.

IS 13620 : 1993

1

Indian Standard

FUSION BONDED EPOXY COATED REINFORCING BARS — SPECIFICATION

1 SCOPE

This standard covers deformed steel reinforcingbars with protective epoxy coating applied byelectrostatic spray method.

2 REFERENCES

The Indian Standards mentioned below are anecessary adjunct to this standard:

3 COATING MATERIALS

3.1 The coating material shall meet therequirements specified in Annex A.

3.2 The patching or repairing material or both,shall be compatible with the coating, inert inconcrete and feasible for repairs at the coatingplant or in the field. This material shall beapproved by the purchaser prior to use. Thepatching or repair shall be performed inaccordance with the recommendation of thematerial manufacturer.

4 REINFORCING STEEL

4.1 Steel reinforcing bars to be coated shallconform to IS 1786 : 1985.

5 SURFACE PREPARATION

5.1 The surface of the steel reinforcing bars to becoated shall be cleaned by abrassive blastcleaning to near white metal. The surface profileshall be free from mill scale, rust and foreignmatter when viewed under well-lit conditions.

5.2 The coating shall be applied to the cleanedsurface as soon as possible after cleaning. Anyformation of rust blooms on the cleaned bars areto be removed by blast cleaning beforeapplication of the coating. However, in no caseshall the coating be delayed more than eighthours after cleaning unless otherwise permittedby the purchaser.

6 APPLICATION OF COATING

The coating shall be applied as anelectrostatically charged dry powder sprayedonto the grounded steel bar using an electrostaticspray gun. The powder may be applied to eithera hot or cold bar. The coated bar shall be given athermal treatment specified by themanufacturer of the epoxy resin which willprovide a fully cured finish coating. Temperatureshall be controlled as recommended by themanufacturer of the coating to ensure aworkman like job without blistering or otherdefects.

7 REQUIREMENTS OF COATED BARS

7.1 Coating Thickness

7.1.1 For acceptance purposes at least 90percent of all coating thickness measurementsshall be 0.1 mm to 0.3 mm after curing. Thecoating thickness limits do not apply to patchedareas. A minimum of 15 measurements shall betaken approximately evenly spaced along eachside of the test bar. At least 90 percent of thesemeasurements shall be within the specifiedlimits.

NOTE — By mutual agreement between the purchaserand the manufacturer, thicker coating may be acceptedwhere the bars are not to be bent or worked after thecoating has been applied.

7.2 Continuity of Coating

The coating shall be visually inspected aftercuring for continuity of the coating and shall befree from holes, voids, contamination, cracksand damaged areas discernible to the unaidedeye. In addition, there shall be not more thanan average of two holidays per 300 mm whentested in accordance with 8.2.

NOTE — Holiday means a pinhole not discernible to theunaided eye.

7.3 Adhesion

The adhesion of coating shall be evaluated on arepresentative number of bars selected inaccordance with 9.4 from each production lot.No visible cracks or disbonding in the coatingon the outside radius shall be allowed whentested in accordance with 8.3.

IS No. Title

1786 : 1985 High strength deformed steelbars and wires for concretereinforcement ( third revision )

6885 : 1973 Method for knoop hardnesstesting of metals

IS 13620 : 1993

2

8 TEST METHODS

8.1 The thickness of the coating shall bemeasured on the body of reinforcing barbetween deformations and ribs or both, on astraight length. Non-destructive coating thick-ness measurements using magnetic gaugesshall be used.

8.1.1 ‘Pencil’ type pull-off gauges which requirethe operator to observe the reading at theinstant the magnet is pulled from the surfaceand do not hold shims tightly against the steelplate during calibration are not recommendedfor use.

8.1.2 Gauge calibration with shims shall beperformed on a smooth, clean, low-carbon steelplate (at least 75 × 75 × 13 mm), rather than ona clean reinforcing bar.

8.1.3 A correction factor defining the effect ofthe bar preparation process shall be obtainedas the difference between ( a ) the average ofthe 10 gauge readings on a cleaned butuncoated reinforcing bar of the size and lotbeing coated and ( b ) the average of 5 gaugereadings on a smooth mild steel plate. Thiscorrection factor shall then be subtracted fromall subsequent gauge readings on coated bars.

8.1.4 Fixed probe gauges shall be checked toensure that the force generated by the springloaded probe housing is sufficient to ensureintimate contact between the probe tip and thecoating on the curved bar surface. If intimatecontact does not result, it will be necessary toremove the probe housing and utilize hand-pressure to obtain valid indicated thicknesses.

8.2 Holidays

A 67.5 volts holiday detector shall be used inaccordance with the detector manufacturer’sinstructions. The detector may be an in line DCdetector or a hand held DC detector.

8.3 Adhesion of Coating

The adhesion of the coating shall be evaluatedby bending production coated bars 120 degrees(after rebound) around a mandrel of size asprescribed in Table 1. The bend test shall bemade at a uniform rate and shall take up to 90seconds to complete. The two longitudinaldeformations shall be placed in a planeperpendicular to the mandrel radius and thetest specimen shall be at thermal equilibriumbetween 25°C and 35°C.

NOTE — The fracture of partial failure of steelreinforcing bar in the bend test for adhesion of coatingshall not be considered as an adhesion failure of thecoating.

Table 1 Mandrel Diameter for Bend Test Requirements

( Clause 8.3 )

9 FREQUENCY OF TEST

9.1 Coating thickness shall be tested at afrequency of not less than one full length barevery twenty bars for each size.

9.2 Continuity of coating shall be determinedby testing one full length bar in every twentybars for each size.

9.3 Coating thickness over the whole of thecoated bar section shall be determined bysectioning and examining one bar in everytwenty tonnes for each size.

9.4 For testing adhesion of coating, samplesshall be selected from each size according to thefrequency given below:

10 RETEST

10.1 If the specimen for coating thickness or foradhesion of coating fails to meet the specifiedrequirements, twice the number of samplesoriginally selected shall be tested for eachfailure test. If the results of these retests meetthe specified requirements, the coated barrepresented by the samples shall be accepted.

Bar Diameter,mm

Madrel Diameter,mm

(1) (2)

6 60

8 80

10 100

12 100

16 125

18 150

20 150

22 200

25 200

28 225

32 280

36 280

40 400

45 450

50 500

Nominal Size of Bar, mm No. of Samples

Up to 16 1 for every 1 tonnes

Above 16 and up to 25 1 for every 2 tonnes

Above 25 1 for every 4 tonnes

IS 13620 : 1993

3

11 HANDLING AND IDENTIFICATION

11.1 All systems for handling coated bars shallhave padded contact areas. All bundling bandsshall be padded or suitable banding shall beused to prevent damage to the coating. Allbundles of coated bars shall be lifted with astrong back, spreader bar, multiple supports, ora platform bridge to prevent bar-to-barabrasion from sags in the bundles of coatedbars. The bars or bundles shall not be droppedor dragged.

11.2 The identification of all reinforcing barsshall be maintained throughout the fabricationand coating processes to the point of shipment.

12 INSPECTION

All tests and inspection shall be made at theplace of manufacture prior to shipment, unlessotherwise specified.

13. PERMISSIBLE COATING DAMAGE AND REPAIR AFTER COATING APPLICATION

13.1 Coating damage due to fabrication andhandling need not be repaired in case wherethe damaged area is 40 mm2 or smaller.

13.2 All damaged areas larger than 40 mm2

shall be repaired with patching material.

13.3 Maximum amount of damage shall notexceed 2 percent of the surface area of each bar(total of damage in 13.1 and 13.2).

13.4 Patching shall be done in accordance withthe patching material manufacturer’srecommendations.

14 REJECTION

Coated bars represented by the samples that donot meet the requirements of this specificationshall be rejected. By mutual agreementbetween the purchaser and the manufacturer,such bar may be stripped of coating, recleaned,re-coated, and resubmitted for acceptance testin accordance with the requirements of thespecification.

15 MANUFACTURER’S CERTIFICATE

If requested by the purchaser, themanufacturer shall furnish, at the time ofshipment, a written certificate that the coatedreinforcing bars meet the requirements of thisspecification.

16 IDENTIFICATION AND MARKING

16.1 The manufacturer or supplier shall markthe bars in such a way that all finished barscan be traced to the cast from which they aremade or the original identification mark of thebars.16.2 Each bundle containing the bars may alsobe suitably marked with the Standard Mark inwhich case the concerned test certificate shallalso bear the Standard Mark.16.2.1 For each bundle of bars a tag shall beattached indicating the Cast No./Lot No., gradeand size of the bars.

ANNEX A( Clause 3.1 )

REQUIREMENTS FOR ORGANIC COATINGS

A-1 COATING MATERIAL

The coating material shall comply with therequirements given in A-2 to A-8 the pigment,if used may be inorganic compound.

A-2 CHEMICAL RESISTANCE

A-2.1 The chemical resistance of coating shallbe evaluated by immersing coated reinforcingbars in each of the following:

a) Distilled water,b) A 3 M aqueous solution of CaCl2.

c) A 3 M aqueous solution of NaOH, andd) A solution saturated with Ca (OH)2.

A-2.2 Specimens without holidays andspecimens with 6 mm diameter intentionalholes drilled through the coating shall betested. The temperature of the test solutionshall be 30 ± 5°C. Minimum test time shall be45 days. The coating shall not blister, soften,lose bond, nor develop holidays during thisperiod. The intentionally made holes shallexhibit no undercutting during the 45-dayperiod.

IS 13620 : 1993

4

A-3 RESISTANCE TO APPLIED VOLTAGE (TYPE OF ACCELERATED CORROSION TEST)

A-3.1 The effects of electrical andelectrochemical stresses on the bond of coatingto steel and on the film integrity of the coatingshall be assessed.

A-3.2 Apparatus and Electrolyte

A-3.2.1 Test Vessel

A non-conductive plastic material shall be usedfor the vessel or as a lining in a metallic vessel.Dimensions of the vessel shall permit thefollowing requirements:

a) Test specimens shall be suspendedvertically in the vessel with at least 25mm clearance from the bottom.

b) Test specimens shall be separated by notless than 40 mm.

c) Test specimens shall be separated fromany wall of the vessel by not less than40 mm.

d) Depth of the electrolyte shall permit thetest length of the specimen to beimmersed, but the immersed area shallnot be less than 23, 200 mm2.

A-3.2.2 Electrodes

The cathode and anode shall be reinforcing barscoated with the proposed material.

A-3.2.3 Electrolyte

The electrolyte shall be an aqueous solution of7 percent NaCL.

A-3.2.4 Electrical Connection

A potential of 2 V shall be applied.

A-3.3 No film failures as evidenced by evolutionof hydrogen gas at the cathode or appearance ofcorrosion products of iron at the anode, shalltake place during first hour of testing.

A-3.4 The test shall be continued for 30 daysand the elapsed time for development of thefirst holiday shall be recorded. No under-cutting of the coating shall occur at any holidaythat develops during the test. If no holiday hasdeveloped during the 30 days, singleintentional hole 6 mm in diameter shall bemade in both the cathode and the anode. Thenthe test shall be continued for an additional24 h in which time no undercutting shall occur.

A-4 ADHESION OF COATING

A-4.1 The adhesion of the coating shall beevaluated by bending three coated reinforcingbars 120 degrees (after rebound) around a150 mm diameter wooden mandrel. The bendtest shall be made at a uniform rate and shalltake up to 1 min to complete. The twolongitudinal deformations may be placed in aplane perpendicular to the mandrel radius andthe specimen shall be at the thermalequilibrium of 30 ± 5°C.

A-4.2 No cracking of the coating shall be visibleto the unaided/naked eye on the outside radiusof any of the three bent bars.

A-5 BOND STRENGTH TO CONCRETE

A-5.1 The bond strength of the reinforcing barsin concrete shall be determined with pull-outspecimens (two coated bar specimens and twouncoated uncleaned bar specimens) by methodoutlined in IS 1786 : 1985 as modified in A-5.2to A-5.8. The test specimens shall be coatedand uncoated bars of 20 mm nominal diameter.Bond strength shall be calculated from the loadat a measured slip of 0.025 mm and 0.25 mm.

A-5.2 The age of the concrete shall be 28 days.

A-5.3 The test shall be carried out applyingaxial force on the bar and by measuring the slipat free end of the bar. The test shall becontinued up to the failure of the bond betweenbar and the surrounding concrete. The failureshall deemed to have occurred when the freeend slip of the bar exceeds 0.2 mm.

A-5.4 The load and slip measurements arerecorded at a slip of 0.01 mm, 0.1 mm and atfailure.

A-5.5 The mean bond strength at the measuredslip of 0.025 mm and 0.25 mm for coated barsshall not be less than 80 percent of thecorresponding mean bond strength for uncoatedbars.

A-6 ABRASION RESISTANCE

A-6.1 The resistance of the coating on each ofthe steel panels to abrasion by a Taber abrasoror its equivalent using CS-10 wheels and 1 kgload, shall be such that the weight loss shallnot exceed 100 mg/1 000 cycles.

A-7 IMPACT TEST

A-7.1 The resistance of the reinforcing barcoating to mechanical damage shall bedetermined by the falling weight test.

IS 13620 : 1993

5

A-7.2 Apparatus

A-7.2.1 Tup

The tup shall have 1.8 kg mass, and should beused over a drop range of 0.60 to 1.25 m. Thehead of the tup shall terminate in ahemispherical 15.875 mm diameter nose.

A-7.2.2 Drop Tube

A tube approximately 1.50 m long shall be usedto contain the tup and guide it during free fall.A scale shall be attached for measuring theheight of the drop to the nearest 2.0 mm.

A-7.2.3 Specimen Holder

The base plate of the apparatus shall include adevice for positioning and holding the testspecimen on line with the axis of the verticaldrop line.

A-7.3 Impact shall occur on the low layingareas on the coated bars, that is, betweendeformations and ridges. The test shall beperformed at room temperature. With animpact of 9 Nm, no shuttering, cracking, orbond loss of the coating shall occur except atthe impact area, that is, area permanentlydeformed by the tup.

A-8 HARDNESS TEST

A-8.1 The hardness of the reinforcing barcoating shall be determined by knoop hardnesstester according to the method given inIS 6885 : 1973 using a 10 g mass. The averageof four individual hardness measurementsmade in the area between deformations or ribson at least two coated reinforcing bars shall beequal to, or shall exceed the Knoop Hardnessnumber of 16.

IS 13620 : 1993

6

ANNEX B( Foreword )

Cement and Concrete Sectional Committee, CED 2

Chairman Representing

DR H. C. VISVESVARAYA In Personal capacity ( University of Roorkee, Roorkee 247667 )

Members

SHRI H. BHATTACHARYA Orissa Cement Limited, New Delhi

SHRI G. R. BHARTIKARSHRI U. N. RATH ( Alternate )

B. G. Shirke and Co, Pune

DR A. K. CHATTERJEESHRI S. H. SUBRAMANIAN ( Alternate )

The Associated Cement Companies Ltd, Bombay

CHIEF ENGINEER ( DESIGNS )SUPERINTENDING ENGINEER (S & S) ( Alternate )

Central Public Works Department, New Delhi

CHIEF ENGINEER, NAVAGAM DAMSUPERINTENDING ENGINEER, QCC

( Alternate )

Sardar Sarovar Narmada Nigam Ltd, Gandhinagar

CHIEF ENGINEER (RESEARCH-CUM-DIRECTOR)

RESEARCH OFFICER (CONCRETE TECHNOLOGY)

Irrigation and Power Research Institute, Amritsar

DEPUTY DIRECTOR (I)ASSISTANT DIRECTOR (EH) ( Alternate )

National Building Organization, New Delhi

DIRECTORJOINT DIRECTOR ( Alternate )

A. P. Engineering Research Laboratories, Hyderabad

DIRECTOR (CMDD) (N & W)DEPUTY DIRECTOR (CMDD)

(NW & S ) ( Alternate )

Central Water Commission, New Delhi

SHRI K. H. GANGWALSHRI V. PATTABHI ( Alternate )

Hyderabad Industries Limited, Hyderabad

SHRI V. K. GHANEKAR Structural Engineering Research Centre (CSIR), Ghaziabad

SHRI S. GOPINATHSHRI R. TAMILAKARAN ( Alternate )

The India Cements Limited, Madras

SHRI S. K. GUHA THAKURTASHRI S. P. SHANKARANARAYANAN

( Alternate )

Gannon Dunkerley & Company Limited, Bombay

DR IRSHAD MASOODDR MD KHALID ( Alternate )

Central Building Research Institute (CSIR), Roorkee

SHRI N. C. JAINDR. S. P. GHOSH ( Alternate )

Cement Corporation of India, New Delhi

JOINT DIRECTOR, STANDARDS (B & S) (CB-I)JOINT DIRECTOR, STANDARDS (B & S)/

(CB-II) ( Alternate )

Research, Designs and Standards Organization (Ministry of Railways),Lucknow

SHRI N. G. JOSHISHRI P. D. KELKAR ( Alternate )

Indian Hume Pipes Co Limited, Bombay

SHRI D. K. KANUNGOSHRI B. R. MEENA ( Alternate )

National Test House, Calcutta

SHRI P. KRISHNAMURTHYSHRI S. CHAKRAVARTHY ( Alternate )

SHRI C. REDDY ( Alternate )

Larsen and Toubro Limited, Bombay

DR A. G. MADHAVA RAOSHRI K. MANI ( Alternate )

Structural Engineering Research Centre (CSIR), Madras

SHRI G. K MAJUMDARSHRI S. O. RANGARI ( Alternate )

Hospital Services Consultancy Corporation (India) Ltd, New Delhi

SHRI M. K. MUKHERJEESHRI M. K. GHOSH ( Alternate )

Roads Wing, Department of Surface Transport (Ministry of Transport),New Delhi

MEMBER SECRETARYDIRECTOR (CIVIL) ( Alternate )

Central Board of Irrigation and Power, New Delhi

SHRI NIRMAL SINGHSHRI S. S. MIGLANI ( Alternate )

Development Commissioner for Cement Industry (Ministry of Industry)

IS 13620 : 1993

7

Members Representing

SHRI R. C. PARATECOL. R. K. SINGH ( Alternate )

Engineer-in-Chief;s Branch, Army Headquarters, New Delhi

SHRI Y. R. PHULLSHRI S. S. SEEHRA

Central Road Research Institute (CSIR), New Delhi

SHRI Y. R. PHULLSHRI N. K. SINHA ( Alternate )

Indian Roads Congress, New Delhi

DR C. RAJKUMARDR. S. C. AHLUWALIA ( Alternate )

National Council for Cement and Building Materials, New Delhi

SHRI G. RAMDASSHRI R. C. SHARMA ( Alternate )

Directorate General of Supplies and Disposals, New Delhi

SHRI S. A. REDDISHRI N. PRABHAKAR ( Alternate )

Gammon India Ltd, Bombay

REPRESENTATIVE Builder’s Association of India, Bombay

SHRI J. S. SANGANERIASHRI L. N. AGARWAL ( Alternate )

Geological Survey of India, Calcutta

SHRI S. B. SURISHRI N. CHANDRASEKARAN ( Alternate )

Central Soil and Materials Research Station, New Delhi

SUPERINTENDING ENGINEER (DESIGN)EXECUTIVE ENGINEER (S. M. R. DIVISION)

( Alternate )

Public Works Department, Government of Tamil Nadu, Madras

SHRI TARWINDER SINGHSHRI ALOK AGGARWAL ( Alternate )

Hindustan Prefab Ltd, New Delhi

DR H. C. VISVESVARAYASHRI D. C. CHATTURVEDI ( Alternate )

The Institution of Engineers (India), Calcutta

SHRI Y. R. TANEJA,Director (Civ Engg )

Director General, BIS ( Ex-Officio Member )

SecretarySHRI J. K. PRASAD

Joint Director (Civ Engg ), BIS

Concrete Reinforcement, Subcommittee, CED 2 : 13

Convener

DR C. RAJKUMAR National Council for Cement and Building Materials, New Delhi

Members

DR ANIL KUMAR ( Alternate toDr C. Rajkumar )

BRIG S. V. ABHYANKAR Engineer-in-Chief’s Branch, Army Headquarters, New Delhi

DR J. L. AJMANISHRI S. C. MOHANTY ( Alternate )

The Tata Iron & Steel Co Ltd, Jamshedpur

SHRI C. R. ALIMCHANDANIEXECUTIVE DIRECTOR (SPECIAL PROJECTS)

( Alternate )

Stup Consultants Ltd, Bombay

SHRI K. G. BALRAMSHRI V. NARAYANASWAMY ( Alternate )

Multiweld Wire Co Pvt Ltd, Bombay

SHRI S. N. CHANDASHRI R. D. CHOUDHRY ( Alternate )

Metallurgical & Engineering Consultants (India) Ltd, Ranchi

SHRI S. K. CHELLANISHRI RAMESH KOHLI ( Alternate )

Usha Ismal Ltd, Ranchi

CHIEF ENGINEER (DESIGN)SUPERINTENDING ENGINEER (CDO)

( Alternate )

Central Public Works Department, New Delhi

CHIEF ENGINEER (KAD)DIRECTOR (PP) ( Alternate )

Irrigation Department, Government of Punjab

SHRI C. DASGUPTASHRI S. GOPALAN ( Alternate )

Bhilai Steel Plant, Bhilai

IS 13620 : 1993

8

Members Representing

SHRI D. I. DESAISHRI A. L. BHATIA ( Alternate )

Gammon India Ltd, Bombay

SHRI R. R. DESAISHRI M. S. PATHAK ( Alternate )

Tensile Steels Ltd, Bombay

DIRECTORDEPUTY DIRECTOR ( Alternate )

National Buildings Organization, New Delhi

DIRECTOR (HCD — NW & S )DIRECTOR (N&W) ( Alternate )

Central Water Commission, New Delhi

SHRI M. R. DOCTORSHRI V. C. TRICKUR ( Alternate )

Special Steels Ltd, Bombay

SHRI V. K. GHANEKARSHRI D. S. PRAKASH RAO ( Alternate )

Structural Engineering Research Centre, Ghaziabad

SHRI P. K. GUPTA National Metallurgical Laboratory (CSIR), Jamshedpur

SHRI J. N. JAMBUSARIASHRI P. S. VENKAT SUBRAMANIAN ( Alternate )

Killick Nixon Ltd, Bombay

SHRI M. P. JASUJA Research & Development Centre for Iron & Steel (Steel Authority ofIndia), Ranchi

JOINT DIRECTOR STANDARDS (B & S) CB-IIASSTT DESIGN ENGINEER (B & S) (CS-I)

( Alternate )

Research Designs & Standards Organization, Lucknow

Joint Secretary Steel Re-rolling Mills Association India, Calcutta

SHRI H. N. KRISHNA MURTHYDR. P. C. CHOWDHURY ( Alternate )

Tor Steel Research Foundation in India, Calcutta

SHRI V. N. MADGESHRI S. B. MALEKAR ( Alternate )

Hindustan Construction Co Ltd, Bombay

SHRI R. K. MATHUR Public Works Department, Government of U.P., Lucknow

SHRI M. K. MUKHERJEESHRI N. K. SINHA ( Alternate )

Roads Wing (Department of Surface Transport, Ministry of Transport),New Delhi

SHRI S. N. PALSHRI SALIL ROY ( Alternate )

M. N. Dastur & Co Pvt Ltd, Calcutta

SHRI A. S. PRASADA RAOSHRI H. G. SREENATH ( Alternate )

Structural Engineering Research Centre, Madras

SHRI T. SEN IRC Steels Ltd, Calcutta

DR C. N. SRINIVASANSHRI C. N. RAGHAVANDRAN ( Alternate )

C. R. Narayana Rao, Madras

Standard MarkThe use of the Standard Mark is governed by the provisions of the Bureau of Indian

Standards Act, 1986 and the Rules and Regulations made thereunder. The Standard Mark onproducts covered by an Indian Standard conveys the assurance that they have been producedto comply with the requirements of that standard under a well defined system of inspection,testing and quality control which is devised and supervised by BIS and operated by theproducer. Standard marked products are also continuously checked by BIS for conformity tothat standard as a further safeguard. Details of conditions under which a licence for the use ofthe Standard Mark may be granted to manufacturers or producers may be obtained from theBureau of Indian Standards.

Bureau of Indian Standards

BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promoteharmonious development of the activities of standardization, marking and quality certification of goods andattending to connected matters in the country.

Copyright

BIS has the copyright of all its publications. No part of these publications may be reproduced in any formwithout the prior permission in writing of BIS. This does not preclude the free use, in the course ofimplementing the standard, of necessary details, such as symbols and sizes, type or grade designations.Enquiries relating to copyright be addressed to the Director (Publications), BIS.

Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are alsoreviewed periodically; a standard along with amendments is reaffirmed when such review indicates that nochanges are needed; if the review indicates that changes are needed, it is taken up for revision. Users ofIndian Standards should ascertain that they are in possession of the latest amendments or edition byreferring to the latest issue of ‘BIS Catalogue’ and ‘Standards : Monthly Additions’.

This Indian Standard has been developed from Doc : No. CED 2 (4737)

Amendments Issued Since Publication

Amend No. Date of Issue

Amd. No. 1 April 1994

BUREAU OF INDIAN STANDARDS

Headquarters:

Manak Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi 110002.Telephones: 323 01 31, 323 33 75, 323 94 02

Telegrams: Manaksanstha(Common to all offices)

Regional Offices: Telephone

Central : Manak Bhavan, 9 Bahadur Shah Zafar MargNEW DELHI 110002

323 76 17323 38 41

Eastern : 1/14 C. I. T. Scheme VII M, V. I. P. Road, KankurgachiKOLKATA 700054

337 84 99, 337 85 61337 86 26, 337 91 20

Northern : SCO 335-336, Sector 34-A, CHANDIGARH 160022 60 38 4360 20 25

Southern : C. I. T. Campus, IV Cross Road, CHENNAI 600113 235 02 16, 235 04 42235 15 19, 235 23 15

Western : Manakalaya, E9 MIDC, Marol, Andheri (East)MUMBAI 400093

832 92 95, 832 78 58832 78 91, 832 78 92

Branches : AHMED ABAD . BANG ALOR E. BHO PAL. BH UBANE SH WAR . C OI MB ATOR E. FARI DA BAD. G HAZI ABA D. GUWAH ATI . H YDER ABAD . JAI PUR . K ANPUR . LUCKNOW. NAGPUR. NALAGARH. PATNA. PUNE. RAJKOT. THIRUVANANTHAPURAM.VISHAKHAPATNAM.