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Re: rust in reinforcement

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The surface condition requirements are covered in ACI-318 section 7.4.  The commentary to this section further references an ACI Journal article "Effects of Rust and Scale on the Bond Characteristics of Deformed Reinforcing Bars", Sept. 1968.

Generally a small amount of rust is not detrimental and can even increase the bond.  However, severe rusting and worse yet actual scaling and chipping can be a problem.  Assuming you have not lost a significant amount of cross section then you can remove the rust by wire brushing, sand blasting, or hydroblasting.

If your exposed rebar is near the ocean I would hydroblast it regardless due to possible chloride (salt) deposits.

Thomas Hunt, S.E.
ABS Consulting

"Puebla Raul" <rpuebla(--nospam--at)>

05/22/2003 06:38 AM
Please respond to seaint

        To:        <seaint(--nospam--at)>
        Subject:        rust in reinforcement

Dear colleagues,

One has a construction that was paralyzed 8 years ago, now it is wanted
to continue the construction, the question is the treatment to give to
the steel reinforcement that is rusty or the treatment that are required
to reuse this reinforcement
Inside the Aci that norms should be completed

       Does anyone have any ideas or information of this topic.

       Thank you for any help you may be able to give.


Raúl Marino P.
Structural engineer
Ecuador Sudamerica

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