Concrete: Gunite & Shotcrete

So let's talk about shotcrete or gunite and gunite rather this is used mostly for slope stabilization and it is shot with a pneumatic gun and there's two kinds one is gunite the other is shotcrete. Gunite, you're shooting the dry ingredients through the gun and water is mixed at the nozzle versus shotcrete could be wet or dry mixed. Everything is shot with a pneumatic gun and the ingredients are the same as concrete. It's water, it's cement, it's sand and gravel, but the gravel is smaller so it can go through the nozzle. So in this case, we're looking at a deep foundation, there's a basement, and we see some shotcrete here, and they're stabilizing the slope. They don't want to cave in, and you can see here with this very long bit that goes in the ground to a certain depth, then they put in a steel rod or a threaded rod, then they shotcrete that threaded rod in the hole. And this attachment here is called a soil nail or dead man or tiebacks. And they're holding back these HP profile steel shapes in place to stabilize. And then they shot crete to stabilize the sand and not let it cave in. So it's not a finished surface. It's not to be occupied. It's just stabilizing the formwork. These pictures I took, but again, they were not very good conditions, so I'm sorry they're fuzzy a little bit. But what we have here are piers in the ground, and then there's welded wire fabric on top of it, and there's shot creating to make it somewhat of a clean surface instead of the dirt. Again, it's for a basement. So that's set for gunite and shotcrete. Basically, it's sprayable liquid concrete, and it's stronger than regular concrete.