Concrete is a good dampener, for sure. Low shrink grout is excellent for this kind of thing. If you do it, use a fairly dry mix and compact it with a vibratory settler to remove the air - you can rent one pretty cheap. Intimate contact between the steel and the grout after the grout is cured is essential for best results. It is a good idea to at least clean the surfaces that will contact the cement or grout and if possible, prime. Don't fill when the structure is cold - warm it up and let it 'soak' first. Get the filler material and the structure at about the same temp and keep them there to avoid internal condensation.
Scott
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