(A) Type.
(1) Every cubic yard of concrete in place shall contain approximately 1.50 barrels of cement. The fine aggregate shall be concrete sand No. 14 and shall meet State Highway Commission Standard Specifications. The coarse aggregate shall be Concrete Aggregate "L" No. 5, and shall meet the State Highway Commission Standard Specifications.
(2) The concrete shall consist of one part of the best Portland Cement, two parts of fine aggregate and three parts of coarse aggregate accurately measured. Water for use with cement in concrete shall be free from oil, acid, injurious alkali and/or vegetable matter.
(B) Mixing.
(1) The aggregate, cement and water shall be thoroughly mixed in an approved batch mixer so designed, constructed and operated that a thorough mixing of the materials is assured and the consistency of all batches is the same. All of the material shall remain in the drum of the mixer for a period of not less than two minutes, during which time the drum shall revolve not less than 14 nor more than 20 revolutions per minute. The entire contents of each batch shall be removed from the drum before the materials for the succeeding batch are placed therein.
(2) The volume of material mixed per batch shall not exceed the manufacturer's rating or a rating approved by the Associated General Contractors of America.
(3) If the actual construction work of the sidewalk is being done by the property owner himself or herself, the mixing may be done by hand providing the workmanship meets the specifications so set out in this subchapter.
(C) Consistency. The consistency of the concrete shall be measured as described in Tentative Method of Test for Consistency of Portland Cement, A.S.T.M. Serial Designation D 138-32T. The slump shall not be less than one inch nor more than three inches.
(Ord. 644, passed 8- -2001)