X-Ray is much more accurate than GPR, but you have to understand how to interpret the shadow images of an X-Ray, which is different from the reflective image of photography.
D. Matthew Stuart, P.E., S.E., F.ASCE, SECB
Structural Division Manager
Pennoni Associates Inc.
One Drexel Plaza
3001 Market Street, 2nd Floor
Philadelphia, PA 19104
Office 215-222-3000 x7895 | Direct 215-254-7895
Fax 215-222-0789 | Mobile 908-309-8657
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I don't think X-Ray will get you close enough for engineering dimensions. It's difficult enough to distinguish between a #4 bar and #5 bar with X-Ray. Besides, X-Ray is a difficult technology to work with. You pretty much have to clear the area for quite some distance. Sonar is probably just as effective, but will also not give you dimensions.
I recommend you chip and repair.
T. William (Bill) Allen, S.E.
Consulting Structural Engineers
32302 Camino Capistrano, #206
San Juan Capistrano, CA 92675
V (949) 248-8588•F (949) 209-2509
I believe you can take X-ray photographs of the column and measure the photograph. Check with the people who do this sort of thing.
H. Daryl Richardson
----- Original Message -----
From: IRV FRUCHTMAN
Sent: Thursday, October 06, 2011 9:24 AM
Subject: Identify steel I-beam
Is there a way to determine dimensions of an I-beam, encased in a square concrete column, to find its elastic properties, instead of chipping out the concrete?