(10-16-2016, 02:11 PM)KevinL Wrote: So here's what I don't get. if this new issue has nothing to do with the grounding of the rebar, why are they removing concrete so far back? Can't they just bring in a cutter and shave off those few errant millimetres?
If it was too close, maybe - though you can't really cut the concrete accurately and keep a smooth surface. And some of the edge may be too far away. They have to cut back to the rebar so the new concrete bonds properly, otherwise it would just fall off. The tolerance is 1400 +5/-0 mm from track CL to platform edge, which is very tight for "bridge building" techniques.