Rebar in existing conc wall
Rebar in existing conc wall
(OP)
What methods are their available to determine the size and spacing of rebar in a 14" thick conc wall. The arch wants to place a new door in the existing wall and the existing documents do not show any rebar info.
Thanks.
Thanks.






RE: Rebar in existing conc wall
GPR works pretty well. Spacing is easily determined in each direction, and a good operator can get close on a bar size but they are often wrong on the size. For a 14" wall they would need to scan on both sides, but it is quick to do.
RE: Rebar in existing conc wall
Yes, radiography can be used (not x-rays, but gamma rays), but 14" of concrete will require a long shot time, thus increasing the downtime of all in the area that will have to be moved out during the exposure time.
RE: Rebar in existing conc wall
We have used this in couple of renovation projects, but as indicated by Ron earlier, it would be a wise thing to measure the true rebar size and cover by exposing rebar at couple of locations.
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RE: Rebar in existing conc wall
RE: Rebar in existing conc wall
Mag particle is really used for checking for cracks in steel-weld-steel issues where everything is magnetically conductive, but I'm wondering if the liquid particles would react to the magnetic field of the test probe intersecting the bars under the concrete.
RE: Rebar in existing conc wall
Mike McCann
MMC Engineering