According to ACI 306 (American Concrete Institute Code), how to they define "cold-weather" concrete?
HINT: A. A period when for more than 3 successive days, the average daily air temperature drops below 45F and stays below 55F for more than one-half of any 24 hour period.
B. A period when for more than 2 successive days, the average daily air temperature drops below 32F and stays below 40F for more than one-half of any 24 hour period.
C. A period when for more than 3 successive days, the average daily air temperature drops below 40F and stays below 50F for more than one-half of any 24 hour period.
C. A period when for more than 3 successive days, the average daily air temperature drops below 40F and stays below 50F for more than one-half of any 24 hour period.
QOM: JAN 2010
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Posted - 01/04/2010 : 3:50:39 PM
