Home -> Forums

What are the benefits of using TMT bars for construction of homes

Fri Sep 07, 2018Total posts : 2
Muhammad
Muhammad
Join date: Jul 2018
Topic: What are the benefits of using TMT bars for construction of homes

What are the benefits of using TMT bars for construction of homes
Mon Sep 10, 2018Post  #1
S L Gupta (Civil Engg)
S L Gupta (Civil Engg)

Join date: Mar 2008

MT Bars (Thermo Mechanically Treated Bars)

TMT Bars,Thermo mechanically treated bars are high strength deformed steel bars used in reinforced cement concrete (RCC) work manufactured with the help of advancement of technology. TMT bars are latest production in MS steel bars and have superior properties such as strength, ductility, welding ability, bending ability and highest quality standards at international level.

What is thermo mechanically treatment process?

By adopting thermo mechanically treatment process higher strength of TMT bars is obtained. In this process, steel bars get intensive cooling immediately after rolling. When the temperature is suddenly reduced to make surface layer hard, the internal core is hot at the same time.  Due to further cooling in atmosphere and heat from the core, the tempering takes place. This process is expected to improve properties such as yield strength, ductility and toughness of TMT bars. With above properties, TMT steel is highly economical and safe for use. TMT steel bars are more corrosion resistant than Tor steel.

How to get higher strength of TMT bars?

Generally, higher strength of TMT bars can be obtained by increasing carbon content, micro alloying, and thermo mechanically treatment or cold twisting. So far in India, cold twisting of bars is extensively used for the production of high strength bars. The two main ribs become helical when cold twisting process is done whereas these ribs in hot rolled bars are straight. The excess of carbon content threatens its property of welding ability.   

In TMT bars, this problem has been eliminated. In these bars, carbon content has also been brought down leading to improved ductility and can be restricted to 0.2% to attain welding ability and at the same time no strength is lost. The joints can be welded by ordinary electrodes without any extra precautions.  

 

Features of TMT Bars

  • Better ductility and malleability
  • High yield strength and toughness
  • More bonding strength
  • Earthquake resistance
  • Corrosion resistance
  • High thermal resistance 
  • Economical and safe in use
  • No loss in strength at welded joints
  • Ordinary electrodes used for welding the joints
 

Caution

  • While purchasing TMT bars, notice identification mark on these bars from manufacturing firm. 
  • For big projects it is advised to check that only one type/grade of bars is brought to the site and is used in the project after conducting test for each lot. Do not use mixed, 2 or 3 types/grades bars in RCC work at one work.      
;
 
Mon Sep 10, 2018Post  #2
S L Gupta (Civil Engg)
S L Gupta (Civil Engg)

Join date: Mar 2008
Dear Sir,
      Addition to above

HSD Steel Bars (High Strength Deformed Bars)

High strength deformed bars IS: 1786-1985 are steel bars which are provided with lugs, ribs, projection or deformation on the surface and are produced in form of cold twisted deformed bars. These bars are extensively used for reinforcement purposes in a construction. Due to ribs or projections on the surface, these steel bars minimize slippage in concrete and increase the bond between two materials i.e. between cement concrete and steel bars.

The deformed bars have more compressive and tensile stress than that of mild steel plain bars. High strength deformed bars have improved anchorage; therefore they can be used without end hooks or bent up ends of bars. This reduces labor for fabrication of steel reinforcement.  The deformation is spaced on bar at uniform distances. These bars are produced in sizes or sections from 4 mm to 50 mm in diameter.  
  
Generally cracks develop in reinforced concrete around mild steel bars due to stretching of bars, loss of bond under the load. To minimize this problem, deformed bars having projecting ribs or twisted surface which improves the bond with the concrete should be used in RCC work.   

Features of HSD Bars

  • Low carbon value: HSD Bars have lower carbon level, resulting in good ductility, strength and welding ability.
  • Superior bonding strength: HSD bars are well known for their excellent bonding strength when used with concrete. 
  • Welding capability: Since these bars have lower carbon content, they have 100% welding capability than conventional bars.
  • High tensile strength: HSD bars feature high tensile strength. They offer great asset in construction process, where a lot of bending and re bending is required. 
  • Wide application range: These bars have wide application range like in building residential, commercial and industrial structures, bridges, etc. 
  • Satisfactorily malleability, minimum weight and maximum strength and suitable for both compression and tension reinforcement.

Process of production of bars

The main process for production of bars is hot rolling followed by cold twisting. Latest technological advances in the field of micro-alloying of steel and thermo-mechanical treatment process have resulted in the production of deformed bars as reinforcement for use in cement concrete in three grades namely Fe 415, Fe 500 and Fe 550.       

The strength of bonds of deformed bars

In addition, the calculated strength of bonds of deformed bars should be 40 to 80 % higher than that of plain round bars of same nominal size. Tor steel possesses the strength of 1.5 to 2.0 times of mild steel in compression as well as in tension, whereas it costs only 10% more than mild steel.
Deformed steel bars have minimum 0.2% proof stress or yield stress in N/mm square. Proof stress is the stress at which non proportional elongation equal to 0.2% of the original gauge length takes place. Hence deformed steel bars are very economical to use in RCC work. Structural Engineer recommends cold twisted deformed (Ribbed or Tor Steel Bars) bars as they are best quality steel bars for construction work.

 




Mechanical properties of high strength deformed (HSD) steel bars for concrete reinforcement

Property Grade of Steel
 Fe415        Fe500           Fe550
0.2% proof stress/ yield stress minimum N/mm square415.0         500.0            550.0
Elongation, percent minimum on Gauge length 5.65 VA where A is the cross sectional area of the test piece 
        
14.5           12.0               8.0
Tensile strength, minimum, N/ mm square10% more than proof stress but not less than 485, 8% more than proof stress but not less, than 545, 6% more than proof stress but not less than 585

 

 

Questions (39)

411
views
4
answers

Which TMT bar is best for construction

Last answer on 11/15/2018 1:52:48 AM. by S L Gupta (Civil Engg). Forum started by Vineeth V
1966
views
9
answers

use of tmt bar

Last answer on 6/12/2018 1:37:59 AM. by S L Gupta (Civil Engg). Forum started by sonu.211
386
views
1
answers

Is it possible to test the quality of the Fe 415 TMT steel bars i bought for con

Last answer on 9/16/2018 11:00:00 PM. by S L Gupta (Civil Engg). Forum started by Muhammad
2165
views
4
answers

Whether the electrical PVC conduits be placed under or above TMT bars in RCC roof slab?

Last answer on 1/30/2017 12:00:36 PM. by S L Gupta (Civil Engg). Forum started by vinu
272
views
3
answers

What are the practical ways to transport and store TMT reinforcement bars on-sit

Last answer on 9/17/2019 12:47:39 AM. by S L Gupta (Civil Engg). Forum started by Betty Varghese
1690
views
6
answers

TMT Bars (Thermo Mechanically Treated Bars)

Last answer on 7/23/2018 11:36:52 PM. by S L Gupta (Civil Engg). Forum started by AMIT KUMAR VERMA
486
views
3
answers

What grade of reinforcement bar is most commonly used for homes

Last answer on 9/16/2018 10:58:39 PM. by S L Gupta (Civil Engg). Forum started by Vineeth V
279
views
3
answers

Is there any method that can be used to prevent rusting of steel bars used for c

Last answer on 11/6/2018 1:39:37 AM. by S L Gupta (Civil Engg). Forum started by Anu Mohan
597
views
1
answers

How are TMT grades selected for construction. How do an engineer select the TMT

Last answer on 10/8/2018 12:21:20 AM. by S L Gupta (Civil Engg). Forum started by Anu Mohan
352
views
4
answers

Is HYSD steel bars still used for construction. Do they meet the safety standard

Last answer on 1/10/2019 12:18:04 AM. by S L Gupta (Civil Engg). Forum started by rinu
1232
views
1
answers

Whether 6 x 8mm TMT bars are enough for rcc belt over rubble foundation for 2 story house?

Last answer on 9/30/2016 2:16:48 PM. by karthik. Forum started by vinu
2236
views
5
answers

steel requirement

Last answer on 9/12/2019 2:31:45 AM. by Tanek Bolton. Forum started by Raghavendra
1601
views
1
answers

plz suggest me switches and wire to be used for new home construction wiring

Last answer on 12/27/2014 3:24:08 PM. by S L Gupta (Civil Engg). Forum started by ashok
1001
views
3
answers

Dear sir/madami am building a house in coastal part of goa.need advice from expe

Last answer on 10/11/2015 8:43:58 PM. by JAI PRAKASH. Forum started by prasad K
1128
views
1
answers

For 1850 sq.ft flat roof ,what mm tmt bars used my hall size 21*21 and 11*17 and

Last answer on 8/1/2018 11:18:57 PM. by S L Gupta (Civil Engg). Forum started by satheesh
339
views
3
answers

When we bought TMT bars for house, they said it was anti-rust. We had to stop ou

Last answer on 8/19/2018 11:54:21 PM. by S L Gupta (Civil Engg). Forum started by Vineeth V
16448
views
7
answers

rcc roof thickness and tmt bar size

Last answer on 11/25/2019 11:39:59 PM. by S L Gupta (Civil Engg). Forum started by Techman
265
views
1
answers

My house was flooded during the recent flood, what should i do to check structur

Last answer on 9/5/2018 1:28:37 AM. by S L Gupta (Civil Engg). Forum started by Malini R
294
views
3
answers

Hi, Is there any cost effective methods to hire bending machines for reinforceme

Last answer on 11/15/2018 1:57:28 AM. by S L Gupta (Civil Engg). Forum started by Betty Varghese
1289
views
9
answers

Types of Soil

Last answer on 12/11/2019 3:09:50 AM. by jerry345. Forum started by gpeter
4483
views
43
answers

Is it advisable to install bell on the doors of the puja shelf.

Last answer on 12/11/2019 1:33:01 AM. by LenaSmith. Forum started by sathiyamurthy.s
2098
views
15
answers

Specification for house construction

Last answer on 12/10/2019 11:48:18 PM. by david john. Forum started by kumar
938
views
5
answers

House Plan

Last answer on 12/10/2019 11:17:56 PM. by S L Gupta (Civil Engg). Forum started by sridhar
1026
views
9
answers

I am constructing a home and the area size is 28 X 21. It has 9 Pillars each has

Last answer on 12/10/2019 11:05:57 PM. by S L Gupta (Civil Engg). Forum started by KV
2772
views
6
answers

Anti-Termite treatment before fixing wooden chowkhats and before start of flooring

Last answer on 12/10/2019 11:05:15 PM. by S L Gupta (Civil Engg). Forum started by jaachak
1917
views
3
answers

resume for architectural training(6 months)

Last answer on 12/10/2019 11:02:56 PM. by S L Gupta (Civil Engg). Forum started by zeeshan
3915
views
6
answers

vastu for puja room

Last answer on 12/10/2019 11:02:22 PM. by S L Gupta (Civil Engg). Forum started by anil bhatia
4178
views
23
answers

pooja room

Last answer on 12/10/2019 10:55:26 PM. by S L Gupta (Civil Engg). Forum started by ARVIND GOYAL
6429
views
10
answers

Extending my RCC roof.

Last answer on 12/10/2019 10:54:02 PM. by buyfollowers uk. Forum started by Ashok Vashisht
861
views
4
answers

Construction

Last answer on 12/10/2019 10:51:19 PM. by S L Gupta (Civil Engg). Forum started by Akash Sharma
10717
views
11
answers

Palace of Assembly. Chandigarh. India

Last answer on 12/10/2019 10:50:24 PM. by S L Gupta (Civil Engg). Forum started by Monika
1696
views
11
answers

Help: Doors & Chaukhats

Last answer on 12/10/2019 10:49:47 PM. by S L Gupta (Civil Engg). Forum started by sushantsah
1127
views
6
answers

Gypsum plastering

Last answer on 12/10/2019 10:48:59 PM. by S L Gupta (Civil Engg). Forum started by sanu kumar
2008
views
21
answers

What is Vastu Remedy for Lift in Brahmasthan?

Last answer on 12/10/2019 10:48:32 PM. by S L Gupta (Civil Engg). Forum started by Vipulkumar Chaudhari
16569
views
8
answers

40*60

Last answer on 12/9/2019 11:39:48 PM. by S L Gupta (Civil Engg). Forum started by T RANJITH KUMAR
2616
views
8
answers

Construction

Last answer on 12/9/2019 11:38:55 PM. by S L Gupta (Civil Engg). Forum started by Imran Khan
1682
views
8
answers

education,money & health problem

Last answer on 12/9/2019 11:38:24 PM. by S L Gupta (Civil Engg). Forum started by Manjunatha.E.N.
2371
views
9
answers

Estimate for Construction

Last answer on 12/9/2019 11:37:35 PM. by S L Gupta (Civil Engg). Forum started by PRATUL
1107
views
5
answers

mini marriage hall construction

Last answer on 12/9/2019 11:35:46 PM. by S L Gupta (Civil Engg). Forum started by babus




Articles that might interest you!
TMT
TMT Bars (Thermo Mechanically Treated Bars)
Are you looking for high strength bars for construction of your house? Make a choice of thermo mechanically treated b..
Uses of Granite in Building Construction
In today’s construction industry, Granite is one of the major ingredients. Granite is used in verity of locations and ..
Brass
Brass Doors
Brass doors are very popular for Georgian and Victorian types of architecture in ancient buildings. Today brass doors ..
Are you constructing a cupboard, Learn the difference between wood-only and wood-brick cupboards
Cupboards construction using different materials: Brick and Wooden Cupboards, Just Wooden Cupboards, Mesh Cement and W..
Gharexpert
Gharexpert can save you money during construction
Do you know almost all individual home construction projects in India take more money to complete than what people ori..
HSD
HSD Steel Bars (High Strength Deformed Bars)
To ensure the strength and quality of your house construction, utilize HSD Bars since they are produced in form of col..
Type
Type of Steel Bars
Different steel bars are recommended for their relative tensile stresses.Steel bars are major components of constructi..
Home
Home Construction Safety
There are several home construction safety tips which can be applied during construction of the house. This article wi..
Building
Building New Home V/S Buying Builder Flat
Buying a builder’s flat may be costlier for you rather than building a new home. But if you plan to make your own, you..
Mild
Mild Steel Bars in Cement Concrete
Mild steel bars in reinforced concrete are one of the exceptional building materials. Reinforced concrete requires ver..
What are various types of glasses used in doors?
Types of glasses used in doors-Clear window glass, Plate glass, Prism glass, Quartz glass, Processed glass.......
What are advantages and disadvantages of folding doors?
Advantages of folding doors- Easy to install,washable, durable, superior sound damping. Disadvantages-sensitive to har..
What are various designs available in wooden doors?
Designs available in Wooden doors.....
What is standard size of internal folding doors?
Size, Thickness and Weight of Internal Folding Doors.......
What affects the life of doors? What can we do to increase the life of the Wooden doors?
Tips to increase the life of Wooden doors....
What is the standard size of frame for Plastic/PVC doors?
Plastic Door frame size carrying one or two shutters......
What are various frames recommended for Plastic/PVC doors?
Frames for Plastic Doors..........
Which place is appropriate for sliding door?
Appropriate places for sliding doors-Bathrooms, Backyards, Commercial structures...........
What are various frames recommended for glass doors?
Frames for Glass Doors-Wooden frames, Steel frames, Aluminium frames......
Which place is appropriate for folding doors?
Appropriate places for folding doors-Homes, Offices, Guest rooms, gives attaractive and stylish look........
What are the various accessories recommended for folding doors?
Accessories for folding doors- Door Handles, Door Fasteners,Door Viewers.......
What affects the life of doors? What can we do to increase the life of the Plastic/PVC doors?
Tips to increase the life of Plastic doors....
Copyright 2007- GharExpert.com All rights reserved.  

 
 |  Advertize with us  |  About us  |  Contact us  |  RSS  |  Blog  |  Terms of service  |  Style made simple  |  Decorating slide show  |  Tips  |  Give your feedback  |