Insight from the DOTPosted October 11 2011
At night, they use modified concrete... (night pours)
In this instance they're doing (1" to 2" thick... an overlay) a walkway on bridge.
The acceptable evaporation for this pour is .1 pounds per foot per hour.
If this rate increases due to wind change, relative humidty or temperature, and they are out of spec., the job won't start or they'll halt it....
In a day pour, it can change to .2 pounds per foot per hour, it must be below that to pour.
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