Is 2090 Specification for High Tensile Steel Bars Used in Pr

7/28/2019 Is 2090 Specification for High Tensile Steel Bars Used in Pr

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IS : 2090 - 1983( HealTimrcd 1989)Indian Standard

SPECIFICATION FORHIGH TENSILE STEEL BARS USED IN

PRESTRESSED CONCRETE( First Revision )

Second Reprint SEPTEMBER 1993

UDC 669.14.018.295-422:666.982.4


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IS : 2090 - 1983(Realfinned 1989)Indian Standard


PRESTRESSED CONCRETE( First Revision )

Joint Sectional Committee for Concrete Reinforcement, BSMDC 8Chairman Representing

Srn:r G. S. RAO CrntralPublic Works DepartmentMembers

S~~T~:~I~TENIIINI~ ENGINEER(CD0 ) ( Alternate toSutrr G. S. RAO )DR.J ,L. AJM.ANISrcltr A. IT . MITRA (Alternate ) The Tata I ron & Steel Co Ltd. J amshedpurDtc Av11. KU~AR Cement Research Institute of India, New DelhiSIIRJ E. T. ANTIA The Concrete Association of India, BombaySHR~P. SRINIVAY AN ( Alternate )SHl%l . 13ANE:RJ zESII~ S. N. CH.~NDA Steel Re-Rolling Mi lls Association of India, CalcuttaMetallurgical and Engineering Consultants ( India )

Ltd, RanchiSHRJ R. D. CHOUDH.+RY ( Alternate )CHI EF ENGINEER D & R ) Ir rigation D:partment, Government of Punjab,Dmncron ( C D ) ( Altarnate ) ChandigarhDEPUTV DIRYCTOR, STANDARDS Research, Designs & Standards( I3 & s )-I ( Ministry of Railways), Lucknow OrganizationASSISTANT DIRECTOR, STAN-DARDR (B & S )-II ( Alternate )SHRI D. I. DESAISHRI A. L. BH ATIA ( Alternate ) Gammon India Ltd, BombaySARI M. R. DOCTORSHRI S. G. J OSHI ( Alternate ) Special Steels Ltd, BombaySH~ ZACHARIA GEORGE Structural Engineering Research CentreMadrasSBR~G. V. SURYAKUMAR (Alfernate )SHRI V. K. GHANE I~AR Structural E ngineering Research CentreRoorkeeSHRI D. S. PR.4KASH RAO (Alternate )

( CSIR),( CSIR 1,

( Continued on page 2 )Q Copyight 1983

BUREAU OF INDI AN STANDARDSThis publication i s protected under the Indian Cofprieht ct ( XXV of 1957 ) and

Ireproduction in whole or in part by any means except with written permission of thepublisher shall be deemed to be an infringement of copyright under the said Act.


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IS : 2090 - 1983( Continued from page 1 )

Members Rejresen tingSHRI V. GULATI Heatly & Gresham (India ) Ltd, New DelhiSHRI P. K. GUPTE National Metallurgical Laboratory ( CSIR ),J amshedpurSHRI N. C. J OIN Stup Consultants L td, Bombay

SHRI M. C. TAND~N ( Alternate )SHR~ M. P. J ASUJ A Research & Development Centre for I ron and Steel( SAI L ), RanchiSRRI A. J AYAQOPAI . Engineer-in-Chiefs Branch, Army HeadquartersMAJ R. CHANDRASEKHARAN ( Alternate )SRRI S. Y. KHAN Killick Nixon Ltd, BombaySHRI P. S. VENKAT ( Alternate )SHRI M. N. KHANNA Bhilai Steel Plant ( SAIL ), BhilaiSHRI C-DASOIJ PTA ( Ahernate )SHRI H. N. KRISENA MURTEY Tor Steel Research Foundation in India, CalcuttaDR C. S. VISWANATHA ( Alternate)SHRI S. N. MANOHAR Tata Consulting Engineers, BombaySHRI N. NAQARAJ ( Alternate )SHRI R. K. MATHUR Public Works Department, LucknowSHRI S. N. PAL M. N. Dastur & Co (P) Ltd, Calcutta

SHRI SALIL ROY ( Alternote )SHRI B. K. PANTHAKY Hindustan Construction Co Ltd, BombaySHRI P. V. NAIK ( Alternate )SHRI T. SF_N IRC Steels Ltd, CalcuttaSHRI M. V. SHASTRY Roads Wing ( Ministry of Shipping and Transport )SHRI SHIRISH H. SHAH Tensile Steel Ltd, BombaySHRI M. S. PATHAK ( Alternate )SHRI C. N. SRINIVASAN C. R. Narayana Rao, MadrasSHRI C. N. RAOHAVENDRAN (Alternate )SHRI K. S. SRINIVASAN National Buildings Organization, New Delhi

SHRI A. K. LAL ( Alternate)SHRI G. RAMAN, Director General,BIS ( Ex-o$cio Member )Director ( Civ Engg )

SHRI M. N. NEELAKANDHANAssistant Director ( Civ Engg ), ISI


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18:2090-19s3Indian Standard


PRESTRESSED CONCRETE( Firsr Revision)

0. FOREWORD0.1 This Indian Standard ( First Revision ) was adopted by the IndianStandards Institution on 14 March 1983, after the draft finalized by theJoint Sectional Committee for Concrete Reinforcement had beenapproved by the Civil Engineering Division Council.0.2 This standard was first published in 1962 to cover the requirementsof high tensile steel bars used in prestressed concrete. The presentrevision has been taken up with a view to incQrporating modificationsfound necessary as a result of experience gained in using this standardboth by manufacturers and users.0.3 10 this revision, modifications have been incorporated in provisionsrelatiig to tolerances, proof stress and relaxation test. The requirementof youngs modulus has been deleted. Further S.I. units have beenadopted for specifying the various physical requirements in the standardand references to various other Indian Sandards appearing in thisstandard have been updated.0.4 In the formulation of this standard, due weightage has been giveti tointernational co-ordination among the standard and practices prevailing.in different countries in addition to relating it to the practices in the fieldin this country.


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IS : 2090 - 19831. SCOPE1.1 This standard covers the requirements for high tensile steel bars usedin prestressed concrete.Z TERMINOLOGY2.0 For the purpose of this standard, the following definitions shallapply.2.1 Bar - A rolled rod or bar of steel of circular cross-section.2.2 Elongation - The increase in length of a tensile test specimen understress. The elongation at fracture is conventionally expressed as apercentage of the original gauge length of the standard test specimen.2.3 High Tensile Steel - Alloy steel having a tensile strength of notless than 980 N/mm%.2.4 Nominal Size - The dimension of the diameter of the bar.2.5 Proof Stress - The stress which produces a residual strainof 0.2 percent of the original gauge length ( non-proportional elongation ).2.6 Tensile Strength - The maximum load reached in a tensile testdivided by the original cross-sectional area of the gauge length portionof the test specimen.3. MANUFACTURE AND CHEMICAL COMPOSITION3.1 The steel shall be manufactured by the,open-hearth, electric, duplex,acid bessem. er, basic oxygen ( LD ) process or a combination of theseprocesses with the addition of necessary alloying elements. In case anyother process is employed in the manufacture, prior approval of thepurchaser shall be obtained. The steel shall be hot rolled into bars andsubsequently processed to give the required physical properties. Wherethe bars are threaded the thread shall be either cut or rolled. Threadedends shall be protected from corrosion and damage.

3.1.1 The ladle analysis of steel when made in accordance with therelevant parts of IS : 228* shall show that steel contains not more than0.050 percent of sulphur and not more than 0.050 percent ofphosphorus.3.2 All finished bars shall be cleanly rolled to specified dimensions.


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ISr2o!m-19834. NOMINAL SIZES4.1 Bars shall be manufactured in the fcllowing nominal sizes:

10, 12, 16,20,22, 25,2&l and 32 mm.5. TOLERANCES!kl Nominal Size - The tolerance on the n,ominal size shall bef O-5 mm for bars up to and including 25 mm and f 0.6 mm for barsabove 25 mm,5.2 Mass - The tolerance on the mass of the finished bar shall bei 5 percent for bars of diameter up to and including 16 mm and f 3percent for bars above 16 mm.

NoTE - When ban are ordered by mass, the mass of the bars shall be calculatedon the basis that high tensile steel weighs 0.785 kg/cm of cross-sectional area permetre run.5.3 When necessary, other tolerances may be agreed between thepurchaser and the manufacturer.6. PHYSICAL RRQmMENTS6.1 The tensile strength, proof stress and alongation, when determinedin accordance with 7.2.2 shall be as given in Table 1.

TABLE I MECHANICAL PROPERTIES OF BARS( ClwJ I 8.1 )

CEABA~IaTlo RlEQIJnt~Tensile strength, Ma 980 N/mm*Proof strer Not less than 80 percent of the

minimum specified tenrilestrengthElongation at rupture on a gaugelength 965 r/A, Mia ( whereA k the area of crwetion )

10 percent

6.2 Relaxation - The relaxation of stress in the bar, when tested inaccordance with 7.3, shall not exceed 49 N/mm8 at the end of 1000 hours.Alternatively, the manufacturer shall provide proof that the quality of


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IS : 2090 - I983finished Agths or from any part of the bar in the presence of thepurchaser or his authorized representative.

7.1.2 Before the specimens are selected, the manufacturer or suppliershall furnish the purchaser or his authorized representative with copiesof mill records giving thi number of bars in each cast with sizes, marks,etc, whereby the bars can be identified.7.2 Tensile Test

7.2.1 The test specimens shall not be annealed or otherwise subjectedto heat treatment unless the bars from which they are cut are similarlytreated in which case the specimen shall be similarly and simultaneouslytreated- with the bars before testing.

7.2.2 The tensile strength, proof stress and elongation shall bedetermined in accordance with the methods specified in IS : 1608-1972*.NOTE - In cases where the manufacturingproce-ss ncludes cold working, test todetermine compliance with proof stress requirements need not be made within 48hours of such cold working.

7.3 Constant Strain Relaxation Test - If required by the purchaser,the manufacturer shall provide evidence from records of tests of similarbars that the relaxation of stress from an initial stress of 70 percent of thespecified minimum tensile strength conforms to that specified in 6.2.During the whole .period of test the temperature shall be maintained at20 & 2C. The initial load shall be applied in a period .of not morethan 5 minutes and shall then be held constant for a further period ofone minute. Thereafter no ad,justment of load shall be made, and theload relaxation readings shall commence from the end of sixth minute.On no account shall the test piece be overstressed. The number ofspecimens tested shall be as agreed between the purchaser and themanufacturer.8. 8AMPLING AND CRITERIA FOR CONFORMITY8.1 Scale of Sampling

8.1.1 Lot - In any consignment, all the high tensile steel bars of thesame size and manufactured from the same cast shall be grouped togetherto conqtitute a lot.


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IS : 2090- 1983.

TABLE 2 SIZE OF THE SAMPLE AND SUB-SAMPLE( Clauses 8.1.2 and 8.2.3 )

LOT h-Z SIZE OF SAMPLE SIZE OF SUB-SAMPLE(1)

up to 5051 to 100

101 to 200201 to 300301 to 500501 and above

(2)5

1015203040

(3)222335

8.2 Number of Tests8.2.1 All the bars selected as in 8.1.2 shall be examined for freedomfrom defects (see 3.2 ) and tolerance on nominal size and mass( see 5 ).8.2.2- Requisite material from any one of the bars in the lot shall besubjected to chemical analysis ( see 3.1.1 ).8.2.3 The number of bars to be subjected to the tensile test ( see 7.2 )

shall be equal to the size of the sub-sample as given in co1 3 of Table 2.8.3 Criteria for Conformity

8.3.1 The lot shall be considered as conforming to the requirements ofthis specification if the conditions mentioned in 8.3.2 to 8.3.5 aresatisfied.8.3.2 The number of bars failing to satisfy one or more of therequirements specified in 4 and 6 shall not exceed the correspondingpermissible number given below:

Size of Sample Permissible Number5 0

10 115 120 2


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IS : 2090 - 19833.1.1 If the test results for any of the characteristics fail to satisfy thecorresponding requirements, two more rests for that characteristic shallbe done and both these test results shall satisfy the requirements for thatcharacteristic.

8.3.4 For physical requirements except proof stress, the mean and therange of the test results obtained for the various characteristic shall satisfythe appropriate condition(s) given below:*a) ( Mean + 0.6 Range ) shall be less than or equal to the maximumspecification limit.b) ( Mean - 0.6 Range ) shall be greater than or equal to theminimum specification limit.

8.3.5 For proof stress, all the test specimens shall satisfy the require-ments of the characteristic.9. DELIVERY, INSPECTION AND TESTING FACILITIES9.1 Unless .otherwise specified, general requirements relating to thesupply of material, inspection and testing shall conform to IS : 1387-1967*.9.2 No material shall be despatched from the manufacturers or supplierspremises prior to its being certified by the purchaser or bib authorizedrepresehtative as having fulfilled the tests and requirements laid down inthis standard exceot where the bundle or coil containing the wire ismarked with the IS1 Certification Mark.9.3 The purchaser or his authorized representative shall be at liberty toinspect and verify the steel makers certificate of cast analysis at thepremises of the manufacturer or supplier; when the purchaser requiredan actual analysis of finished material, this shall be made at a placeagreed to between the purchaser and the manufacturer or supplier.9.4 Manufacturer Certificate - In the case of bars which have notbeen inspected at the manufacturers works, the manufacturer or supplier,as the case may be, shall supply the purchaser or his authorized represen-tative with the certificate stating the process of manufacture and testsheets signed by the manufacturer giving the result of each mechanical


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IS : 2090 - 198310. IDENTIFICATION AND MARKING10.1 The bar manufacturer shall attach to every bundle a suitable metallag Mhich shall bear the manufacturers name, the size of the bar, thelrpat number of the cast from which the bars have been rolled and the(I(-signation of the standard. All bars or bundles of bars shall be markedin SLICES way that it is possible to trace all finished bars to the cast from\\hich 1hry were made.

10.1.1 Each bar or the metal tag attached to every bundle of bars mayalso br marked with the Standard Mark.,

NOTE - The use of the Standard Mark is governed by the provisions of theBureau of Indian Qandards Act, 1936 and the Rules and Regulations made there-under. The Standard Mark on products covered by an Indian Standard conveysrhe assur.inse that they have been produced to comply with the requirements of thatstandard under a well defined system of inspection, testing and quality controlwhich is devised and supervised by BIS and operated by the producer. Standardmarked products are alqo continuously checked by BIS for conformit;r to thatstandard a< a further safeguard. Details of conditions under which a licence forthe use of the Standard Mark may be granted to manufacturers or producers mayhe obtained from the Bureau of Indian Standards.


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BUREAU OF INDIAN STANDARDSHeadquarters:Manak Bhavan, 9 Bahadur Shah Zafar Marg, NEW DELHI 110002Telephones: 331 01 31, 331 13 75 Telegrams: Manaksanstha( Common to all Offices)Regional Offices: TelephoneCentral : Manak Bhavan, 9 Bahadur Shah Zafar Marg.

I331 01 31NEW DELHI 110002 331 1375

*Eastern : 1 /14 C. I. T. Scheme VII M, V. I. P. Road, 36 24 99Maniktoia, CALCUTTA 700054Northern : SC0 445-446, Sector 35-C,CHANDIGARH 160036

Southern : C. I. T. Campus, MADRAS 600113I

2 18 433 16 4141 24 4241 25 1941 29 16TWestern : Manakalaya, E9 MIDC, Marol, Andheri ( East ), 632 92 95BOMBAY 400093Branch Offices:

#Pu.shpak. Nurmohamed Shaikh Marg, Khanpur,I

2 63 48AHMADABAD 380001 2 63 49$,Peenya Industrial Area 1st Stage, Bangalore Tumkur RoadBANGALORE ~60058I

38 49 5538 49 56Gangotri Complex, 5th Floor, Bhadbhada Road, T. T. Nagar, 667 16BHOPAL 462003Plot No. 82/83, Lewis Road, BHUBANESHWAR 7510025315. Ward No. 29, R.G. Barua Road, 5th Byelane,GUWAHATI 781003

5 36 273 31 775-8-56C L. N. Gupta Marg ( Nampally Station Road ),HYDERABAD 500001 23 IO83R14 Yudhister Marg. C Scheme, JAIPUR 302005117/418 B Sarvodaya Nagar, KANPUR 208005

,! 1; ;;{ 21 82 92Patliputra Industrial Estate, PATNA 800013 623 05T.C. No. l4/1421. Urliversity P.O.. Palayam 16 21 04

TRIVANDRUM 6 15035 16 21 17Inspection Offices ( With Sale Point ):


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AMENDMENT NO. 1 JULY i988TO

IS:2090-1983 SPECIFICATION FOR HIGH TENSILESTEELBARS USED IN PRRSTRRSSED CONCRETE

(First Revision)

(Page 4, clause 3.2, third sentence) -Substitute the following for the existing matter:'Unless otherwise agreed between the purchaser andthe manufacturer or supplier the bars shall notcarry on its surface lubricants, rust or othermatter to a degree likely to impair its adhesion toconcrete.

(BSMDC 8) Reprography Unit, BIS, New Delhi. India

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Is 2090 Specification for High Tensile Steel Bars Used in Pr