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I suspect that the tensile properties of stainless might not be as suitable for RC construction ie not as ductile, and fatigue may rears its head too. Also its work hardening properties will make it be a bar steward to bend to the shapes needed (I got caught once trying to bend some 1/4" round...
We were taught* at uni (1971-4) that RC should have minimum cover of 2"/50mm, and up to 4"/100mm in a marine environment.
Imagine my surprise when building RC structures in the next year (on contractor's side) that motorway bridges designed by the local RCU were specified with 45mm cover on the...
One possibility might be to make the side road in question with the bad junction visibility, one way the other way from the junction, subject to being able to maintain suitable movement in the surrounding roads eg reversing another parallel road.
Cardiff, Bristol TM, Westbury, Salisbury, Basingstoke, Woking to Waterloo. I believe c1997/8? (passed it a couple of times on commute home when working in CTRL offices)