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rebar / all-thread vs.deformed ??
2

rebar / all-thread vs.deformed ??

rebar / all-thread vs.deformed ??

(OP)
I'm looking at a stack of rebar and the tag reads A615 grade-75 all-thread rebar.  But in reading the definition of "deformations" in A615 I can't tell if these threads meet the given criteria.  I think these are the bars usually used in tension piles.  We're building a compression member.  At any rate, are there any issues with substituting all-tread rebar for the normal A615 grade-60 deformed rebar?

RE: rebar / all-thread vs.deformed ??

I think you have to take some measurements of your thread bar, based on Table 1 of the specification.

Does the root diameter & perimeter meet or exceed the requirements?

If we consider a thread as a deformation, you would meet the maximum average spacing for deformations. However, does the thread height meet the minimum average height?

My gut feeling is that the thread bar should work.

RE: rebar / all-thread vs.deformed ??

I don't believe that a threaded bar will provide equivalent bond to a deformed bar, but it would certainly be better than a smooth bar.

BA

RE: rebar / all-thread vs.deformed ??

Are you the inspector for this?  If so, this would be something worth passing onto the EOR for review and/or approval.

RE: rebar / all-thread vs.deformed ??

I would ask for justification for the substitution.
Ask for documentation showing that the bar is equivalent.

It's not your job to show/determine that it's equivalent.

RE: rebar / all-thread vs.deformed ??

Reading through a couple of manufacturer's literature, it states that their GR75 all thread bar conforms to ASTM A615.  That was Williams and Dywidag.

RE: rebar / all-thread vs.deformed ??

(OP)
Yes, am the inspector.

It appears that the justification for the substitution is convenience.

Also, it appears to be a Williams bar.

RE: rebar / all-thread vs.deformed ??

2
If the threaded bar conforms to ASTM A615 the threads meet the requirements for deformations.  (This would not be the case for typical "all-thread", which has cut, machine threads, rather than large forged/rolled threads.)  The forged/rolled threadbar from any reputable mill will meet the requirements for deformations.

Typically, the deformation pattern varies by mill and size, and may vary from line to line in a single mill.  Spiral threadbar is just another deformation pattern.

John Turner CSP PE
CRSI Greater Southwestern Regional Manager

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