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?