Can vibration jump a cold joint in concrete?

Vibration cannot jump or transfer across a cold joint in concrete.

Can my equipment foundation be multiple pours of concrete?

Multiple concrete pours are not recommended as there will be a cold joint between pours and vibration will not transfer across a cold joint.

What protection should be provided to a foundation during a cold weather grout pour?

The foundation should be completely enclosed and provided with a heat source to raise the entire foundation and equipment to a temperature above 65°F for 48 hours prior to and after a grout pour.