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Acceptable amount of rust on rebar
2

Acceptable amount of rust on rebar

Acceptable amount of rust on rebar

(OP)
I wanted to get some opions from others as to how much rust would be acceptable on rebar.  I've got a project that was stopped for about 9 months and the rebar had been fabricated but left exposed to weather at the site.  There does not appear to be any flaking or scaling.  The application is mainly foundations for vertical storage tanks where the reinforcing is for shrinkage and temperature.

RE: Acceptable amount of rust on rebar

Based on your description, I wouldn't consider the rust as a problem.

RE: Acceptable amount of rust on rebar

Hi CTW ,

There is no issue to worry about on your rebar state. Thanks SlideRuleEra for the link.

RE: Acceptable amount of rust on rebar

rare for rebar not to have rust.  Probably a good thing since it helps the bond between concrete and steel. If its flaking rust then I would reconsider!

RE: Acceptable amount of rust on rebar

(OP)
Thanks for your responses.

RE: Acceptable amount of rust on rebar

Read 7.4.2 ACI 318.  "Except for prestressing steel, stell reinforcement with rust, mill calse or a combination of both shall be considered satisfactory, provided the minimum dimensions and weight of a hand-brushed test specimen comply with applicable ASTM specifications referenced in 3.5"  You can read the commentary for more information and the CRSI and PCA have more of an explanation as mentioned above.  Rust is ok unless it is loose rust or section loss has occured.

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