| Thu May 07, 2015 | Total posts : 2 |
|  Topic: RCC Roof
Sir Which one is better in RCC Roof kamdhenu steel bars or Jindal steel bars
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| Thu May 07, 2015 | Post #1 | 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.
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| Tue May 12, 2015 | Post #2 | 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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