The concrete shall be mixed in quantities required for immediate use and shall be deposited on the subgrade to the required depth and width of the construction land in successive batches and in a continuous operation without the use of intermediate forms or bulkheads. The concrete shall be placed as uniformly as possible in order to minimize the amount of additional spreading necessary. While being placed, the concrete shall be vibrated and compacted with suitable tools so that the formation of voids or honeycomb pockets is prevented. The concrete shall be especially well vibrated and tamped against the forms and along all joints.
No concrete shall be placed around manholes or other structures until they have been brought to the required grade and alignment. Additional tamping and compaction will be required after raising manholes.
6.1 COLD WEATHER CONCRETING: Concrete may be placed when the air temperature in the shade and away from artificial heat is more than 35°F. and rising. Concrete shall not be placed when the air temperature in the shade and away from artificial heat is less than 40°F. and falling.
6.2 HOT WEATHER CONCRETING: Except by written authorization, concrete placing shall cease if the temperature of the plastic concrete cannot be maintained at 90°F. or lower.
To facilitate the placement of concrete in hot weather, a retarding chemical admixture Type B or D in conformance with ASTM C-494 may be used.
(Ord. 1971-2, passed 4-6-71)