(A) Acceptance of concrete. The Director of Public Utilities shall require all and as many tests as he or she deems necessary to ensure the concrete acceptability. The cost of the test shall be at the supplier's or contractor's expense.
(B) Depositing. Concrete will not be used if it cannot be placed within 90 minutes of the dispatch time. Concrete shall be deposited in a manner so as to prevent contamination by foreign material and segregation due to rehandling or flowing. Segregated concrete and/or concrete consisting of foreign material will not be used. Depositing will not be done when temperature has not exceeded 35°F and rising by 10:00 a.m. Concreting shall cease when the descending air temperature in the shade falls below 40°F. It shall not resume until the ascending air temperature rises to 35°F. All concrete shall be kept from freezing. Frozen concrete shall be replaced. Free fall shall not exceed three feet in any case.
(C) Forms. Forms may be made of wood, plywood, metal or any other suitable material. Forms shall be mortar tight, of material strong enough to resist noticeable deflection or bulging between supports and the interior dimensions of the forms shall be such that the finished concrete shall be of the proper form and dimensions. The design of the forms shall take into account the effect of vibration of concrete as it is placed and also the rate of speed at which the forms will be filled. Mechanical vibrators of an approved type and continuous spading and/or rodding of concrete shall be used to produce proper contact of concrete with forms and reinforcing steel in piers and with forms and pipe in monolithic inverts ensuring a compact, dense and impervious artificial stone of uniform texture.
(D) Curing. All concrete shall be cured by one of the following methods:
(1) Forms left in place for a period of seven days. Exposed concrete shall be moist cured;
(2) Moist curing performed when forms are removed before seven days. All construction joints shall be moist cured; and
(3) Curing compound used immediately after forms are removed and all surface water has disappeared.
(E) Finishing. The structure shall have a uniform and textured surface. All form marks exposed to view shall be rubbed off with a stone.
(Ord. passed 6-21-2011)