(A) The mixture. The materials used in each batch shall be weighed or accurately measured so as to get a uniform product. The materials shall be proportioned so as to produce a uniform, dense, workable concrete which will have a compressive strength of not less than 2,000 pounds per square inch at 28 days. In no case will a mixture be used which has less than six bags of cement for each cubic yard of concrete.
(B) Mixing and placing. The mixing shall be done in an approved batch mixer until the cement is uniformly distributed, and the mass is uniform in color and consistency. The mixing period shall be not less than 90 seconds after all ingredients are in the mixer. The concrete shall be placed in the forms before it begins to set, tamped and struck off to the proper grade.
(C) Curing. The concrete shall be cured by covering with a wet burlap or other approved covering for three days or by using an admixture of calcium chloride. If the work is placed in weather when freezing temperature may be expected, the concrete should be given adequate protection.
(D) Moistening. The sand base for concrete walks and the subgrade for curb and gutter shall be moistened before the concrete is placed.
(Ord. 14-3, passed 2-14-1972) Penalty, see § 93.99