I've done work like this in the past, and if you're going to do it yourself I would recommend getting a mix-on-site company to provide the concrete. Trying to mix that quantity yourself and keep up with what's already down as it starts to cure while you mix more constantly is a flaming pain in the backside. When you figure the cost of the bagged mix along with the rental of the mixer and the extra time it's going to take you to mix it as you go, the mix on site truck can really save you all the way around. I've done patios as big as 16x40 this way, and while it's still a ton of work it's about half the work compared to trying to mix it yourself. Plus, one other factor to consider is that each different batch you mix will be a little different, but once a mix on site truck has the mix right it stays fairly consistent. Just my $.02.





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