How a Bloomington winter tests a slab
Corn belt clay heaves with the frost, the pour window closes on a cold snap, and road salt scales a poorly finished surface. Three things, each changing the job.
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Clay subgrade heaves with the frost line
- McLean County sits on corn belt clay that swells wet and drops dry, and frost under an unexcavated slab lifts it further. A subgrade not dug out and compacted properly moves every winter, cracking the slab poured on top of it by spring.
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The pour window closes fast on a cold snap
- Concrete poured too close to a hard freeze does not cure the way it should, so a scheduled date moves back a few days rather than risk it. Most years that means working the calendar hard between roughly April and October.
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Road salt scales a poorly finished surface
- Deicing salt through a McLean County winter pits and flakes a slab that was finished or sealed wrong, a fault called scaling. Air entrainment in the mix and a sealer kept on schedule are what keep a driveway surface intact.