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Watched a finisher burn a 20x30 slab in Tucson, changed my whole mind on when to start floating
I was on a job in Tucson last July pouring a 20x30 shop slab, and we had wind and 105 degrees with the mix already setting up faster than the truck could chute it out. The guy running the power trowel jumped on it while it was still shiny wet because he was scared of it getting away from us, and we ended up with a crusted finish that looked like a dried up mudflat by the next morning. Been finishing for 11 years and I always waited for the bleed water to leave before floating, but he kept saying the heat meant you had to move when it gets stiff, not when it looks perfect. We tore out a 6 foot section by the door and repoured it two days later, and after that I started checking the actual slab temp with a laser gun instead of just eyeballing the shine. Now I know on hot windy pours you watch the set, not the clock, and the finger test at the edge tells you more than any timetable. What do you all use on days like that to decide when it is safe to start floating, or do you just bring more guys and water?
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