(A) No concrete shall be placed during the period from November 1 to May 1 without authorization. Concrete placed when the temperature is 40°F or less shall be cured and protected from cold weather.
(B) When the temperature falls below 50°F, the mixing water or the aggregates, or both, shall be heated to a temperature of not less than 70°F nor more than 150°F. The heating of the water and the aggregates shall be controlled so that there will not be any large differences from batch to batch.
(C) The use of calcium chloride to accelerate the hardening of concrete will be authorized when the temperature of the air is 45°F, at the rate of one pound of calcium chloride per sack of cement; and for temperatures below 40° F, the rate of application shall be two pounds of calcium chloride per sack of cement.
(D) Immediately after the finishing of the concrete, the concrete shall be covered with waterproof paper blankets and not less than one foot of loose, dry straw or hay over the paper.
(E) No concrete shall be deposited on a frozen subgrade.
(Ord. 483, passed 2-28-00) Penalty, see § 10.99