Home -> Forums

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

Fri Oct 05, 2018Total posts : 1
Anu Mohan
Anu Mohan
Join date: Jul 2018
Topic: How are TMT grades selected for construction. How do an engineer select the TMT

How are TMT grades selected for construction. How do an engineer select the TMT grade that is optimal for construction
Mon Oct 08, 2018Post  #1
S L Gupta (Civil Engg)
S L Gupta (Civil Engg)

Join date: Mar 2008
Dear Sir,
     See the below articles
     

Type of Steel Bars


Generally there are two types of steel bars ("Sariya" in hindi) available in the market.
  1. Mild steel bars

  2. Deformed steel bars

Steel bars used for construction work

(This Picture is Contributed by "Monu")

Mild steel bars (as per IS: 432, part-I -1982)

Mild steel bars are used for tensile stress of RCC (Reinforced cement concrete) slab beams etc. in reinforced cement concrete work. These steel bars are plain in surface and are round sections of diameter from 6 to 50 mm. These rods are manufactured in long lengths and can be cut quickly and be bent easily without damage.

Deformed steel bars (as per IS: 1786-1985)

As deformed bars are rods of steels provided with lugs, ribs or deformation on the surface of bar, these bars minimize slippage in concrete and increases the bond between the two materials. Deformed bars have more tensile stresses than that of mild steel plain bars. These bars can be used without end hooks. The deformation should be spaced along the bar at substantially uniform distances. 

To limit cracks that may develop in reinforced concrete around mild steel bars due to stretching of bars and some lose of bond under load it is common to use deformed bars that have projecting ribs or are twisted to improve the bond with concrete. These bars are produced in sections from 6 mm to 50 mm dia.
In addition the strength of bonds of deformed bars calculated should be 40 to 80 % higher than that of plain round bars of same nominal size. And it has more tensile stress than that of plain round bars of same nominal size.
Cold twisted deformed (Ribbed or Tor Steel Bars) bars are recommended as best quality steel bars for construction work by structural Engineer.

Various Grades of Mild Steel Bars

Reinforcement bars in accordance with standard IS No. 432 part-I can be classified into following types.   

1) Mild Steel Bars: Mild steel bars can be supplied in two grades 

     a)Mild steel bars grade-I designated as Fe 410-S or Grade 60 
     b) Mild steel bars grade-II designated as Fe-410-o or Grade 40

2) Medium Tensile Steel Bars designated as Fe- 540-w-ht or Grade 75


 

Physical Requirement:

 S.NoTypes of nominal size of bars  Ultimate Tensile Stress N/mm2minimum Yield Stress N/mm2 Elongation Percent minimum
 1.Mild Steel Grade I or Grade 60   
  For bars up to 20mm 410250 23 
  For bars above 20mm upto 50 mm 410240 23 
 2. Mild Steel Grade-II or Grade 40   
  For bar up to 20mm 37022523 
  For bars above 20mm upto 50 mm 370215 23 
 3.Medium Tensile Steel Grade-75    
  for bars up to 16mm 54035020
  for bars above 16 mm up to 32 mm   540340 20 
  for bars above 32 mm up to 50 mm 510330 20 

Grade II Mild steel bar are not recommended for use in structures located in earth quake zones subject to severe damage and for structures subject to dynamic loading (other than wind loading) such as railways and highways bridges.

Every lot or consignment of mild steel bars brought at the site of work should be tested in laboratory before use in the work. However for small work one can use mild steel bars on the basis of verifying tests results made by manufacturer in his own laboratory; which are available with supplier. 
Some of manufacturers stamped MS bars grade with their make /name and also give certification of test and grade. On the basis of the above information you can store mild steel bars grade-wise at the site of work.

Steel Bars for RCC Work 

All finished steel bars for reinforced work should be neatly rolled to the dimension and weights as specified. They should be sound, free from cracks, surface flaws, laminations, rough, jagged and imperfect edges and other defects. It should be finished in a work manlike manner. 

Column made of steel bars

(This Picture is Contributed by "Ahmed")

General precautions for steel bars in reinforcement

  • Steel bars are clear, free from loose mil scales, dust and loose rust coats of paints, oil or other coatings which may destroy or reduce bond strength.
  • Steel bars should be stored in such a way as to avoid distortion and to prevent deterioration and corrosion.   
  • Steel bars should not be clean by oily substance to remove the rust.
  • The bar is bent correctly and accurately to the size and shape as shown in drawings. 
  • If possible, the bar of full length is used.
  • Overlapping bars do not touch each other and these should be kept apart with concrete.
  •  The overlap if given should be staggered.
  • The cranks in the bar at the end should be kept in position by using spots.
  • The steel bars should not be disturbed while lying cements concrete.
  • Required cover under steel bars should be given before laying the cement concrete.  
  • No over lap is given in the bar having a diameter more than 36 mm, if required, the bar should be welded.
     
 

Questions (39)

149
views
2
answers

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

Last answer on 9/10/2018 11:55:12 PM. by S L Gupta (Civil Engg). Forum started by Muhammad
654
views
1
answers

Sir I have a plot of length 55.9' and width 17.4' south fasing entrance and 28'

Last answer on 4/18/2015 9:37:30 PM. by JAI PRAKASH. Forum started by Rakesh Singh
999
views
1
answers

we have to do the lining of drains and tanks with acid proof tileshow it can be

Last answer on 5/4/2010 1:13:49 PM. by S L Gupta (Civil Engg). Forum started by amarnath pandey
134
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
1640
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
1470
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
1672
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
2199
views
4
answers

I am constructing my house and now i am in process of selecting floorings, so i

Last answer on 12/10/2014 10:12:46 PM. by JAI PRAKASH. Forum started by Vishnukant Phafat
1824
views
2
answers

I am selecting parrot green laminate for my kitchen, what other colour will comp

Last answer on 11/2/2010 3:44:11 PM. by sheik ibrahim. Forum started by pranju11
780
views
2
answers

TMT rod to be used for the structure

Last answer on 10/3/2015 11:39:32 AM. by S L Gupta (Civil Engg). Forum started by nhrajesh
551
views
1
answers

How to select directions as per name

Last answer on 11/1/2016 11:55:20 AM. by S L Gupta (Civil Engg). Forum started by Uthra
1267
views
1
answers

how to select the lamination color for the Kitchen and wardrobes

Last answer on 7/25/2014 12:40:59 AM. by JAI PRAKASH. Forum started by veera
1318
views
0
answers

I would like to select a house layout plan for two/three BRK house

Last answer on 2/18/2011 8:59:27 PM. Forum started by B N SHANBHAG
969
views
1
answers

i am doing my degree as a final year civil engineering in bannari ammman institu

Last answer on 6/26/2014 10:16:25 PM. by Ahmed. Forum started by rohinipriya
152
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
931
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
731
views
1
answers

Residential complex

Last answer on 4/7/2016 11:20:11 AM. by S L Gupta (Civil Engg). Forum started by lali
3315
views
1
answers

1. The building plan is for 3 storey, Kindly suggest whether the column size 9ft

Last answer on 11/10/2014 2:26:39 PM. by S L Gupta (Civil Engg). Forum started by hemant
2297
views
1
answers

Kindly suggest the columns size/TMT nos/size for maximum distance of 16ft betwee

Last answer on 12/2/2014 12:34:34 PM. by S L Gupta (Civil Engg). Forum started by hemant
256
views
2
answers

can mseal be used in a underground water sump to arrest water leakage caused by

Last answer on 10/20/2018 2:37:34 AM. by shell shockers. Forum started by Y Mitran
251
views
5
answers

Where should be saptic tank in east face plot

Last answer on 10/20/2018 2:35:22 AM. by shell shockers. Forum started by Deepak Gupta
795
views
3
answers

Need planning for complete interior

Last answer on 10/19/2018 11:31:14 PM. by Celeste Jalen. Forum started by Wasim Shaikh
3007
views
6
answers

main door vastu question

Last answer on 10/19/2018 9:08:42 PM. by mi ka. Forum started by sujatha
2566
views
9
answers

kitchen is in nortyh east corner of house

Last answer on 10/19/2018 9:06:39 PM. by mi ka. Forum started by kiran gharat
26
views
0
answers

Is steel bars made from recycled iron good for construction purpose

Last answer on 10/19/2018 3:25:29 AM. Forum started by Muhammad
3195
views
5
answers

How to decorate my house

Last answer on 10/18/2018 11:10:03 PM. by Kayla Dominic. Forum started by Satvinder kaur
37
views
1
answers

East facing 2bhk 25×35

Last answer on 10/18/2018 12:15:33 AM. by S L Gupta (Civil Engg). Forum started by Dr liyakhat ali
899
views
1
answers

Where can I purchase this corner headboard or get dimensions to build it?

Last answer on 10/17/2018 1:08:15 AM. by S L Gupta (Civil Engg). Forum started by Francex
812
views
2
answers

how durable it is i want to know

Last answer on 10/17/2018 1:06:34 AM. by S L Gupta (Civil Engg). Forum started by g sridevi
35
views
1
answers

Hello sir my plot size is 20×50 sq feet. I want house map with car porch

Last answer on 10/17/2018 1:03:50 AM. by S L Gupta (Civil Engg). Forum started by Arjun
55
views
1
answers

20×50 sq feet, I want 01 bedroom, car porch, stairs, baitha.

Last answer on 10/17/2018 1:03:20 AM. by S L Gupta (Civil Engg). Forum started by Arjun
52250
views
9
answers

Steel rod size For column and Tie beam structure

Last answer on 10/17/2018 12:59:34 AM. by S L Gupta (Civil Engg). Forum started by Jitendra Sindhi
3225
views
25
answers

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

Last answer on 10/17/2018 12:57:48 AM. by S L Gupta (Civil Engg). Forum started by sathiyamurthy.s
2128
views
2
answers

Pooja cabinet design

Last answer on 10/17/2018 12:56:02 AM. by S L Gupta (Civil Engg). Forum started by Geedee
987
views
4
answers

Help on Staircase and Elevator design

Last answer on 10/17/2018 12:51:16 AM. by S L Gupta (Civil Engg). Forum started by Dev
425
views
3
answers

Towards east facing of my house we have 3way road, so where I should keep back d

Last answer on 10/15/2018 12:29:22 AM. by S L Gupta (Civil Engg). Forum started by Gururaj
1268
views
3
answers

Pillars

Last answer on 10/15/2018 12:27:19 AM. by S L Gupta (Civil Engg). Forum started by Pandu
6232
views
4
answers

I have 1000 sq.ft.plot in thane and want to make house for personal use.Pls.let

Last answer on 10/15/2018 12:24:21 AM. by S L Gupta (Civil Engg). Forum started by ashish kangutkar
2705
views
11
answers

front elevation

Last answer on 10/15/2018 12:23:26 AM. by S L Gupta (Civil Engg). Forum started by halilul rahman




Articles that might interest you!
How to select Mason
For all type of construction, weather new or alteration, Mason is a very important and selection of a mason is not a b..
Selection
Selection of A Site
The selection of a site depends upon ones present and future spatial requirements, the envisaged available funds, one’..
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..
Building
Building Architect vs. Structure Engineer
It is very important to know the difference between architect and structure engineer if you are planning to construct ..
Tips for selecting Paint Color.
Selected paint colors may look different in different lights, both at daytime and at night. So, you should choose the ..
What are the various tips for selecting paint color?
Selected paint colors may look different in different lights, both at daytime and at night. So, you should choose the ..
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..
Types
Types of Cement
The strength of a construction depends upon the cement of superior quality.
List of construction activities in sequence
Before going for any construction do you know what the sequence of construction activities is? Here is a list of const..
Home
Home Construction Safety
There are several home construction safety tips which can be applied during construction of the house. This article wi..
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  |