We had the heaters running overnight and the interiors of the basement warmed enough to melt any frost in the ground. The huge icicles on the sides of the concrete walls from snowmelt in the framed areas above also thawed and evaporated. Right now the air temperature is sitting at a balmy 6 celsius, however in the basement it would be freezing without heat, not a place for wet concrete to cure properly.
The heater was a timely installation because we had concrete and a placing crew arrive at 8 am to pour the slabs. Use of a pump truck allows much easier placing of the mix into the far corners of the basement. Once set up, the concrete is power troweled and left to cure. Here are a few pictures from the work on site this morning.
1. Mix is being poured into the pump
2. Crew is placing the concrete
3. wet mix is left until it can be finished with the power trowel