When finishing a slab the fibers act as an aggregate and drop below the surface of the concrete when you work up a paste. Its used for parking lots, driveways and floors all the time. In fact, on this house we're doing now, all the basement floors will be stained concrete with helix in it. Also, there's a parking lot at Lite-form, an ICF manufacturer that is a big proponent of helix, that is poured 2" thick with 2" of EPS under it to control frost. This parking lot is full of cars and trucks daily, has been for a few years now and doesn't have a crack in it. Another example is Australia. They pour lots of roads and interstates with it. No rebar. This house we're doing now was all engineered specifically for helix. Has a Missouri stamp on it. I'd say he's willing to bet his career on it.