Field Welding Non-Weldable Rebar 2

[KootK]

Context

- Grade beam on a local infrastructure project. It supports a fence that keeps sabre toothed tigers from eating babies. Low importance factor as with most livestock stuff.

- An unfortunate core has been made through the grade beam top reinforcing.

- Various constraints are making it desirable to get this repair done in as localized a manner a possible. The fence is already in place and its anchorages are nearby to the location where this repair will take place. The repair location is also very close to a plan "corner" where the grade beam changes direction over the pile.

- Quality control on this project is good. You know, other than this ridiculous core.

- One repair option being considered is field welded splices of the reinforcement. This is not weldable rebar, however, so we'd have to deal with preheat.

Questions

How good -- or bad -- of an idea is it to consider field welded reinforcement splices here from a QC perspective?

Is there any danger that the preheated bars would expand and cause the cover concrete of the grade beam to spall?

 

[EdStainless]

We had to repair some bars and we happened to make tube for one of the guys that makes those bar lock style couplings.
We had about 1.5" of bar missing.
We cut some 1.25" pieces of bar, slid the coupling over one end, put the short piece inside, and then slid it to center it.
There was a rule about how many bolts you need on each intact bar.
It worked fine.
We even mocked one up and did some testing on it.

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P.E. Metallurgy, consulting work welcomed