CRS (1).pdf

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1. Corrosion Resistant Steel (CRS/HCRM) by TATA and SAIL


• BIS: No BIS codal provision, patented product.

• IS 1786: While allowing it for micro alloying layer, user may note that there
is a danger of pitting and crevice corrosion when embedded in chloride
contaminated concrete as confirming to IS 11587. (Please refer to
Annexure. 1)

• TATA TISCON Brochure: As per TATA TISCON, they are claiming 1.3
Corrosion resistant indexes which is equivalent to only 30% more than that
of carbon steel / HYSD bar. So with this index, it is very difficult to achieve
desired 100 years design life. (Please refer to Annexure. 2)

• IRC 112: 2011 Code of practice for concrete road bridges: Not
recommending CRS reinforcement bar. (Please refer to Annexure. 3)

• IRC SP 80: 2008 (Corrosion Resistance): Not recommending CRS
reinforcement bar. (Please refer to Annexure. 4)

• "Mechanical and corrosion properties of a high strength, high reinforcing
steel for concrete" by South Dakota Department of Transportation. : Even
with 9% Chromium added rebars were not recommended. (Corrosion
resistant steel has 0.3% Chromium contain) (Please refer to Annexure. 5)

• Protection of metal in concrete against corrosion (ACI 222R-01):
Weathering Steel commonly used for structural steel construction does not
perform well in concrete containing moisture and chlorides and are not
suitable for reinforcement. (Please refer to Annexure. 6)

2. ANNEXURE 1

4. Scanned by CamScanner
ANNEXURE 2

5. Scanned by CamScanner

6. ANNEXURE 3

11. www.coachingtrendsetters.com ANNEXURE 4

12. www.coachingtrendsetters.com

13. www.coachingtrendsetters.com

14. www.coachingtrendsetters.com

15. ANNEXURE 5

18. ANNEXURE 6