|
Advantages
(i)
Better
Safety of structures: because of higher Strength
combined with
higher Ductility.
(ii)
Easy
working at site: owing to better Ductility and
Bendability.
Pre-welded meshes can be made to eliminate manual binding at site.
Reduces
construction and fabrication time.
(iii)
Resists
fire: Unlike Tor steel/ CTD Reinforcement bars, TMT bars
have high thermal
stability. They are the preferred choice when elevated temperatures of
400-6000
C may be encountered (Chimneys, fires).
(iv)
Resists
corrosion: The TMT process gives the bar superior strength
and
anti-corrosive properties. Controlled water-cooling prevents the
formation of
coarse carbides, which has been cited as the main cause for the
corrosive
nature of common bar.
Another reason for better corrosion resistance is the absence of
surface
stresses caused by the cold twisting process.
 |
|
Figure above shows view of
Platform during rainy season which clearly shows the
difference between quality of CTD & TMT Bars
|
(v)
Formability:
Due to very high elongation values and consistent properties
through out the length of bar, TMT rebars have excellent workability
and
bendability.
(vi)
Earthquake
resistance: The soft ferrite-pearlite core enables the bar
to bear
dynamic and seismic loading. TMT bars have high fatigue resistance to
Dynamic/
Seismic loads due to its higher ductility quality. This makes them most
suitable for use in earthquake prone areas.
(vii)
Malleability:
TMT bars are most preferred because of their flexible nature
(viii)
Fine welding
features: TMT rebars (having low carbon content)
can be
used for butt and other weld joints without reduction in strength at
the weld
joints.
(ix)
Bonding
strength: External ribs running across the entire length
of the TMT bar
give superior bonding strength between the bar and the concrete.
Fulfils Bond
requirements as per IS: 456/78 and IS: 1786/85.
(x)
Cost-effective:
A high tensile strength and better elongation value gives you
great savings, Reduced Transportation Costs. .
The
figures of these savings as given in SAIL website are
reproduced below:
Saving in Steel when using SAIL
TMT or SAIL TMT-HCR
(HCR: High Corrosion Resistant) |
|
Grade
® |
Fe
415 |
Fe
500 |
Fe
550 |
| Saving
in steel compared to IS-2062 plain bar
|
40%
|
44%
|
47%
|
| Saving
in steel compared to IS-1786/ Fe 415 CTD
|
.
|
14%
|
19%
|
*
In case of doubly reinforced beams using M15 and M20 grades of cement.
Following advertizement clip available on www.youtube.com beautifully summarizes
the
advantages of TMT Bars in a layman's language.
Applications
TMT
bars find wide applications in different spheres:
- General
purpose concrete re-enforcement structures
- Bridges
- Flyovers
- Dams
- High
rise buildings
- Industrial
structures
- Concrete
roads
- Underground
structures
SAIL
in its website lists out following application areas:
|
Specification
|
Application
|
Special
Qualities |
| SAIL TMT
|
General
concrete reinforcements in high rise buildings, bridges and other
concrete structures |
Excellent
bendability, good weldability and high fatigue resistance on dynamic
loading |
SAIL TMT HCR*(i.e.
High Corrosion Resistant)
|
Construction
exposed to coastal, marine or underground environment
|
In
addition to above this has high corrosion resistance properties
|
|
