The taxi-way system includes the following: 1  A parallel taxi-way 30 metres wide designated P. 2  Link taxiways 30 metres wide marked Q , W , Y & Z. 3  Holding bays at every intersection to the runway.  Loop taxi-ways at both ends of the runways.
Although concrete gains strength more slowly at lower temperatures, the strength of concrete cured at will eventually reach that of concrete cured at 70Â°F. Even if the concrete temperature drops to the mid teens, the hydration process will continue a very slow rate.
The contact between the footers and walls will adhere better when the walls are poured after a few days. There's really no advantage in waiting 28 days for the footers to cure. The curing process with concrete goes on for years to the point where, when fully cured, it starts on the road to breaking down.