As an ex concrete technician and Plant Supervisor (AKA batcher) I watched the concrete house episode with a little bit of horror mixed with amazement. Firstly, there’s bugger all ‘new’ or ‘cutting edge’ about poly or steel fibres in a mix. I was using those 20 years ago. (Blackbushe Metals in Hampshire has a slab they smash cars to bits on. It’s the strongest mix we could supply at the time, containing both microsilica and steel fibres, for instance)
I wasn’t surprised when the shuttering burst. They were pouring what looked like a superplasticised mix (i.e. absolute piss) and the fluid pressure at the bottom would have been very high. Stuff like that is generally poured slowly so it’s going off at the bottom whilst you’re sill pouring in the top.
Im really not sure about not using rebar in the walls and subsitituing fibres instead. As far as I can see it complicates everything. Just use the rebar you muppet.
I did giggle when thy implied the pump couldn’t pump their special mix. Again, that’s was a sloppy superplasticsied mix. It should virtually pump itself. I’d have refused to pay the pump hire because that’s their fault. He probably hadn’t primed the line properly (using cement slurry) or cleaned it out previously. That was a farce, believe me.
The actual house was a disaster too. Bloody awful. Terribly finished. They’ll never sell it.