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THERMO MECHANICALLY TREATED (TMT) BARS DEEPAKRAJ DEEP AKRAJ S.B.
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CONTENTS 1. INTRODUCTION
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1.1 EMERGENCE OF STEEL 2. STEEL AS REINFORCEMENT
2.1 INTRODUCTION 2.2 STEEL BARS/ RODS FOR REINFORCEMENT 2.3 TYPES OF REINFORCING BARS 3. THERMO-MECHANICALLY TREATED BARS 3.1 GENERAL 3.2 PROPERTIES 3.3 INDIAN STANDARD SPECIFICATIONS F OR TMT BARS 3.4 THERMOMECHANICAL TREATMENT PROCESS 3.5 COMPARISON AND M ERITS OVER OTHER PROCESSES
3.5.1 PROCESSES
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IMPORTANCE IMPORT ANCE OF STEEL AS REINFORC REINFORCEM EM
•Tensile strength of concrete is very low, so reinforce is required to resist tensile forces Sign up to vote on this title
•Reinforces the tension capacity of the concrete Not useful Useful
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TYPES OF REINFORCING BARS PLAIN BARS
CTD BARS
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PROPERTIES
•FIRE RESISTANCE Withstand high temperature of the range 500ºC-60 Ensures fire safety Sign up to vote on this title
Useful Not useful •DUCTILITY Due to high elongation and ductility TMT bars are
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•BENDING Exhibit very high bendability and rebendabilty due to carbon content and higher elongation - Easier to wo TMT Bars due to easy bendability Sign up to vote on this title
•WELDABILITY Useful Not useful TMT bars do not suffer from loss of strength due e
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INDIAN STANDARD SPECIFICATIONS FOR TMT BARS IS-1786 (19 CONSTITUENT
CARBON
MAXIMUM PERCENT
TMT 415
FE 415
TMT 500
0.25
0.3
0.25
FE SignTMT up to vote onFE this title 500 Useful 550 Not 550 useful 0.3 0.25 0.3
TMT(F 415/FE 5 FE 550
0.2
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PROPERTY
Steel Rerolling Mill - TMT Bar
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GRADE FE 415
TMT 415
FE 500
TMT 500
FE 550
0.2 percent proof stress/yield stress Min N/mm.sq.
415
415
500
500
550
Elongation.percent Minimum,on gauge length 5.65.Square Root (A) where A is the cross-sectional
14.5
22 (Up to 28mm dia) 20 (Above 28 mm dia)
12
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20 8 18(Upto (Up to 16(Above Sign up to vote on this title 28mm dia) Useful Not useful 18 (Above 26 mm dia)
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TMT PROCESS
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Advanced heat heat treatment technique - Red hot hot rebars controlled water quenching – TMT process help produce reinforcement bars of high strength, sup ductility, weldability, bendability and thermal resistanc Sign up to vote on this title
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Outer surface of bars becomes colder while the core remains hot – hot – Developme Development nt of temperature gradient the bars – bars – After being taken out the heat flows from t core to the outer surface - Causes further tempering steel bars – bars – Steel attains higher yield strength OUTER Sign up to votePERIPHERY on this title
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•Cold twisting and dr •Ductility greatly redu due to cold working •Weldability is incons •High strength is affe Sign uptemperature to vote on this title high at
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COST SAVING IN STEEL – A MERIT OF TMT Area of steel (mm2)
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Dimension of the section (mm)
Mu (kN-m)
Fck
Grade steel
Ast
Asc
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Fe415
Useful
No. & d bar Tension
Not useful 4-20# +
2063
960
4-6# 4-20# +
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TEST TO IDENTIFY I DENTIFY A GENUINE TMT BAR -Helps to understand the characteristi characteristics cs of TMT bars -Necessary to differentiate standard and fake TMT bars which are elusive Sign up to vote on this title
-Involves Cutting a TMT bar
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TEST RESUL RESULTS TS
-Uniform and concentric hardened peri and the softer core -Possess tensile strength coupled with elongation as required in seismic zone Sign up to vote on this title
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Over quenchingExhibit high yield strength and very poor ductility Should never be used in civil construction-
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-Better ductility and weldability
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-Better yield strength, tensile strength and percent elongation
ADVANTAGES
-Easy bendability and thus require less energy for bending rebending
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-Ability to resist loss of strength at higher temperatures
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APPLICATIONS
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•By virtue of various engineering properties TMT bars can b used for Residential Buildings, Bridges, and Industrial Establishment
Sign upwhich to vote on this title •In Steel-concrete composite construction involves on Useful Not useful or more of steel concrete composite elements i.e. composit beam, composite slab and composite columns c olumns
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FACTORS CONSIDERED TO ENSURE QUALITY
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1. Min Minimu imum m yield yield stren strength gth 415 415 N/mm N/mm2
QUALITY
2. Mini Minimum mum tensile tensile strength strength 10% 10% more than than yield strengt strength hs minimum 560
N/mm2
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3. Mini Minimum mum elonga elongation tion 16 16 (general (generally ly 18 to 22). 22).
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-Obtainable in strengths of 415, 500 and 550 MPa
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-Renowned manufactures are SAIL, TISCO, IISCO,RINL a
AVAILABILITY
VIZAG STEEL PLANT etc
up to voteSAIL on this titleTMT HC -Available brands of TMT bars are SAILSignTMT,
VIZAG TMT
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PRODUCTION
-Requires huge investments, expertise and stringent proces
-Production of about 1.5 million tones each year by major pl
-By 2010 TMT bars constitute 80 to 85% of the rebars made country against the present 50 to 55%
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-The Q&T rebars will become the preferred choice
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INFERENCE
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•With its versatility TMT bars overtook CTD bars
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•Vital factors are raw materials, rolling mill and treatment p Sign up to vote on this title
•Fulfilling above factors guarantee quality TMTNotbars Useful useful
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REFERENCE
1 Dr.C.S.Vishwanatha, “History in prospectiveprospective- A journey throug reinforcing bars”, The Indian concrete journal, Jan 2004, vol.78, pp1 2 Dr.S.R.Mediratta, “Steel reinforcement-Demand, reinforcement-Demand, quality and n application in India”, The Indian concrete journal, Jan 2004, vol.78, con 3 Dr.P.Dayaratnam, “Guest editorial comments”, The Indian Sign up to vote on this title journal, Jan 2004, vol.78, pp.3-4. Useful Not useful 4 Dr.C.S.Vishwanatha, “The ABC of TMT T MT bars”, The Master bui Oct-Nov 2004, vol.6, pp.41
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