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A finisher in Lubbock told me to quit burning my edges with the magnesium float
He watched me work a 12x20 slab for 10 minutes and said I was floating too early and pulling cream to the middle, so now I wait for the bleed water to go away and hit it with a steel trowel after. How do you all time your float passes when it's 95 degrees out?
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robin59116d ago
Waiting for the bleed water to disappear before you touch it with steel is the part that's off. That advice works on a small patio pour in mild weather but a 12x20 slab in 95 degrees will skin over fast and if you let all the bleed water come up and dry you're setting yourself up for a crusted top with wet concrete still underneath. The mag float is not the enemy, doing it too early is. You want to float when you can stand on the surface and leave a footprint about a quarter inch deep, that's your window to knock down the ridges and push the cream back where it belongs. Then you wait for the sheen to leave but you come back with the steel while it's still got a little life in it, not bone dry, or you'll drag up crumbs and fight the trowel the whole way. In that heat you're probably talking 20 to 30 minutes between passes, not hours, so stay on it and keep a sprayer handy for the edges.
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