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Rusted rebars

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Is there any reference/standard regarding rusted rebars to be poured with new slab? We have an existing structure with some exposed rebars left unprotected for several years. Those bars were designed to be lapped for later phase of construction. Can someone use wire brush to brush off the rust and reuse them for the lapping?    
 
Any suggestion or help will be appreciated.
 
 
Regards,
Julian Chu