The following figure from the above paper shows Trends (in degrees Celsius per 100 years) for each 5 by 5 latitude-longitude grid box using only nonurban stations for annual maximum temperature, annual minimum temperature, and diurnal temperature range for the period 1950 to 1993.
Concrete continues to gain strength after pouring for as long as it retains moisture, but the longer it moist-cures, the slower the rate of strength gain. Moist-curing concrete for 20 days more than doubles its strength compared with four days of moist-curing, which is considered a minimum.oncrete continues to gain strength after pouring for as long as it retains moisture, but the longer it moist-cures, the slower the rate of strength gain. Moist-curing concrete for 20 days more than doubles its strength compared with four days of moist-curing, which is considered a minimum.
Concrete will continue to set and settle for anywhere up to 20 years. In warm weather, a concrete slab can be walked upon the afternoon of a morning pour. A builder will typically allow 2-3 days before applying any loads, but will keep back propping in for a few weeks to prevent collapse. It is designed to reach it's designated strength 28 after pouring. i.e. 32MPa concrete should reach 32MPa 28 days after pouring.