About to be pouring concrete all night

I feel like the concrete mix I have is nothing but rocks. But it is just that at such a small scale, the aggregate seems enormous, and is very hard to deal with. I thought it was just that I wasn't mixing it correctly, but it turns out that the aggregate being so big is what's messing up my models. Whatever the case, I'm going to pour as much as I can tonight and tomorrow morning, and if I need to buy new mix for the weekend that's fine.

The test tonight is more about the formwork anyway, and making sure that the dirt can hold it's shape and be removed from the underside of the concrete when it cures.