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Reinforcing Steel Strength

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ACI 318 limits the design value of reinforcing steel strength to 80 ksi.  (Section 9.4)
 
So, for example, even though MMFX, which was invented by some world-famous guy no one has ever heard of, has a yield strength of 100 ksi,  it can only be used at 80 ksi in design.
 
Something makes me think that the limit in AASHTO is actually 60 ksi.  Is this correct?
 
Gail Kelley