Weather for Lihue, HI. Overcast 69.6Â° Feels like 69.6Â° High: 79Â° Low: 72Â° Current conditions as of 04/21/17 5:40 AM HST. Humidity: 91% Visibility: 10.0 mi Dewpoint: 67Â° Barometer: 30.06 in Wind: SW Sunrise: 6:12 AM Sunset: 06:59 PM.
The American Concrete Institute recommends a maintained temperature of 70 degrees F for three days or 50 degrees F for five days to gain sufficient strength for a cold pour to perform up to specification.
The now withdrawn design code BS 8110 required that the temperature of the concrete does not fall below 5 O C at any point until the strength has reached 5MPa. The workmanship clauses are now in BS EN 13670 Execution of concrete rather than the desing codes and follow the same requirement. Surfaces that will be in contact with the newly placed concrete, including sub-grade materials, need to be a few degrees above freezing (2 O C). Reinforcing bars (and other embedded metal) must be free of ice and snow but otherwise there is generally no restriction on their temperature prior to casting.