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Stop floating your edges in the heat, it's what's giving you those hairline cracks
I pour in Phoenix and last July I watched a guy float a slab at 1pm when it was 108 out and the surface started tearing two passes in. He kept going because he thought it was still wet underneath. By the time he got his steel out the whole edge was spiderwebbed and he blamed the mix. It wasn't the mix, it was him going back over the same spot every 10 minutes in direct sun. What I do now is get in and out fast, cover with plastic if I can't keep up, and never touch a floated edge again once it starts to set. The idea that you can just keep working an edge all afternoon in that heat is the biggest thing I see new guys get wrong on commercial work. I lost a 40 by 60 slab two summers ago figuring it out the hard way and had to chip out and repour a corner. So what's your cutoff temp where you stop floating and just start curing?
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