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| |
VRKP TMT BARS |
NORMAL CTD BARS |
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| CORROSION RESISTANCE |
 |
 |
High Corrosion Resistant
Does not corrode in Cement |
Less Corrosion Resistant |
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| WELDABILITY |
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 |
Excellent, No loss of strength,
if properly welded. |
Poor, Preferably avoided
as welded joints are week |
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| BEND PROPERTIES |
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| Excellent Flexibility |
Lower bend and
re-bend Capacity |
|
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| FIRE RESISTANCE |
 |
 |
| Safer, up to 600 C |
Strength decreases in fire. |
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| EARTHQUAKE RESISTANCE |
 |
 |
Preferred, it have higher
resistance due to higher ductility |
Low Earthquake resistance
due to lower ductility |
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| STRAIN AGEING |
 |
 |
| Better, Longer life |
Less ageing resistant |
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|
| CONSISTENCY |
 |
 |
High, Consistency and
Excellent workability |
High Variance in properties |
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|
| GLOBAL USE |
 |
 |
| Preferred Choice |
Not Permitted |
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| STRENGTH AND DUCTILITY |
| |
|
High: it derive strength from diffusion
less phase transformation to martensite
and subsequent self-tempering which
makes it with a superior combination of
strength and ductility |
Reasonable; it derive strength frm work hardening where gain instrength results in decrease of ductility. |
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| FATIGUE |
| |
|
TMT bars have high fatigue
resistant to dynamic loading
due to higher ductility. |
Twisted bars have lower
fatigue strength |
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