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The I.C.C. Council and the American Concrete Institute ACI-318 have established thresholds for placement of concrete when cold weather conditions exist. The following information is from various excerpts of the applicable code sections as they apply to the placement of concrete in cold weather conditions.
(1) Footings can be poured when the temperature is 20 degrees Fahrenheit or above, however the following precautions must be adhered to: When temperature falls below 40 degrees Fahrenheit, ACI-318 cold weather requirements shall be followed.
(2) Concrete shall be maintained at a temperature of not less than 50 degrees Fahrenheit for a minimum of three consecutive days after placement of concrete.
(3) Insulated blankets must protect the concrete and forms left in place during the three day period.
(4) The excavation shall not be left open for more than 24 hours. Protection must be provided to keep soil from freezing with insulated blankets.
(B) Foundation walls.
(1) Foundation walls may be poured when the temperature is 40 degrees Fahrenheit or above. When temperature falls below 40 degrees Fahrenheit, ACI-318 cold weather requirements shall be followed.
(2) Concrete shall be maintained at a temperature of not less than 50 degrees Fahrenheit for a minimum of seven consecutive days.
(3) Insulated blankets shall completely cover and be securely fastened to both sides and the forms must be left in place for a period of no less than three days. ACI-318
(1) After the first frost, it is the discretion of the Building Official if flat work can continue. Flat work is allowed if the temperature of the concrete is maintained at 50 degrees for seven consecutive days after concrete placement.
(2) The use of salamanders, or other equipment that exhaust flue gases into the area above concrete floors must be avoided, because of the danger of carbonation to the fresh concrete.
(3) The I.C.C. Code Council and American Concrete Institute ACI-318 provides for alternates for the above. High early strength may be used to substitute the following guidelines. An increase in the amount of cement to a minimum of a six-bag mix and maintaining the concrete at 50 degrees for three consecutive days provides an option for the builders. Additionally, admixtures for high early strength may be added in accordance with the manufactures requirements.
(4) The use of visqueen and straw are not an acceptable means of protection, insulated blankets only.
(5) Please contact the Building Department prior to scheduling concrete.
(Ord. 14-103, passed 5-15-2014) Penalty, see § 150.999