TN BC-C Industrial Practice Questions - Tennessee Industrial (BC-C) Contractor Examination Exam

Per ACI 306, cold-weather concreting practices are required when which condition exists?

The air temperature has fallen to, or is expected to fall below, 40°F during the protection period The concrete delivery temperature exceeds 90°F The relative humidity is below 40 percent on a sunny day The subgrade is dry enough to proof-roll

Correct Answer:

The air temperature has fallen to, or is expected to fall below, 40°F during the protection period

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