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RCC Roof

Thu May 07, 2015Total posts : 3
ARVIND GOYAL
ARVIND GOYAL
Join date: Aug 2014
Topic: RCC Roof

Sir
 Which one is better in RCC Roof
kamdhenu steel bars or Jindal steel bars



Thu May 07, 2015Post  #1
S L Gupta (Civil Engg)
S L Gupta (Civil Engg)

Join date: Mar 2008
Dear Arvind
           Both Steel bars are equally good for use in RCC if you want to go in deep than take the sample of both steel and take the result of lab. Some of test is given below.

Physical Requirement:

 S.No Types of nominal size of bars   Ultimate Tensile Stress N/mm2 minimum  Yield Stress N/mm2  Elongation Percent minimum
 1. Mild Steel Grade I or Grade 60      
   For bars up to 20mm  410 250  23 
   For bars above 20mm upto 50 mm  410 240  23 
 2.  Mild Steel Grade-II or Grade 40      
   For bar up to 20mm  370 225 23 
   For bars above 20mm upto 50 mm  370 215  23 
 3. Medium Tensile Steel Grade-75       
   for bars up to 16mm  540 350 20
   for bars above 16 mm up to 32 mm    540 340  20 
   for bars above 32 mm up to 50 mm  510 330  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.

 


 
Tue May 12, 2015Post  #2
JAI PRAKASH
JAI PRAKASH

Join date: May 2014
All bars have 2 qualities made of scrap or fresh, Both have different price range and life span.
 

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