Can it be too hot or too cold to place new concrete ?

Temperature extremes make it difficult to properly cure concrete . On hot days , to much water is lost by evaporation from newly placed concrete . if the temperature drops too close to dreezing , hydration slows to nearly a standstill . Under these conditions , concrete ceases to gain strength and other desirable properties . In general , the temperature of new concrete should not be allowed to fall below 50 Fahrenheit ( 10 Celcius ) during the curing period .