(A) Composition of concrete. Every cubic yard of concrete used in sidewalk construction in place shall contain approximately one and one-half barrels of cement. The fine aggregate shall be concrete sand No. 14 and shall meet the latest State Highway Commission’s standard specifications. The course aggregate shall be concrete aggregate “L” No. 5 and shall meet the latest State Highway Commission’s standard specifications. The concrete shall consist of one part of the best Portland cement, two parts of fine aggregate, and three parts of course aggregate accurately measured. All water for use with the cement or in concrete shall be clear from oil, acid, injurious alkali, and/or vegetable matter.
(B) Mixing of concrete.
(1) All concrete 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 and not more than 20 revolutions per minute. The entire contents of each batch shall be removed from the drum before the materials for the succeeding batches are placed therein.
(2) The volume of material mixed per batch shall not exceed the manufacturer’s rating.
(3) If the actual construction work of the sidewalk is done by the property owner himself or herself, the mixing may be done by hand provided the workmanship meets the specifications set out in this subchapter.
(C) Consistency of concrete. The consistency of all concrete used in sidewalk construction shall be measured as described in Tentative Method of Test for Consistency of Portland Cement, ASTM serial designation D 138-32T. The slump shall not be less than one inch nor more than three inches.
(D) One course concrete required. All sidewalks shall be of one course concrete.
(E) Laying of concrete.
(1) The subgrade of a sidewalk shall be wet down before the concrete is placed therein. The concrete shall be deposited within the required forms upon the subgrade to such a depth that, after being compacted, it shall be the required thickness. It shall be leveled off and tamped sufficiently to bring the mortar to the surface; after which, it shall be finished smooth and even by means of a wood float. The edges shall be rounded with an edger having a radius of one-quarter inch. Transverse joints shall be cut in the concrete with a jointer having a radius of one-quarter inch and at intervals not greater than the width of the sidewalk being constructed unless otherwise directed by the Street Commissioner. When completed, the sidewalk shall be covered with wet burlap, straw, or sisalkraft paper and kept wet for a period of not less than 48 hours.
(2) No concrete work shall be done during freezing weather. When there is danger that the temperature shall reach the freezing point, sufficient straw or other suitable material shall be added to the covering material to prevent freezing of the concrete before it is thoroughly cured.
(Prior Code, § 95.059)