yeah, here is a real classic prop, the infamous concrete barrier.
we made the normals for the rebars with nvidia PS filter, and the normals for the concrete with mudbox.
diffuse also in mudbox
but we missed to make also some concrete rubble, that still sticks to the rebars.
also the rebars could use some more grey look.
we used patch deform for the rebars
thats the concept
and thats the product