Any and all concrete used for the purposes set forth in this section shall be mixed and placed in accordance with the American Concrete Institute and the following specifications:
(1) Contain a Portland cement content of six and one-half bag mix at ninety- four pounds per bag;
(2) Have an air entrainment of six percent (6%) to eight percent (8%) at the time of pour;
(3) Consist of clean and sound, coarse aggregate (one inch or smaller required);
(4) Contain no more water than will present a slump between a minimum of four inches and a maximum of six inches. Other slumps are permitted when designed and supervised by an Engineer;
(5) Have a uniform thickness of four inches (4") in the driveway and six inches (6") in the apron from the property line to the curb or street line; and
(6) Be reinforced with wire reinforcing mesh having a maximum spacing of six inches in either parallel direction between wires and a minimum wire size of Number 10 U.S. Gauge or other approved methods such as fibrous concrete;
(a) Base.
(1) The Engineer of the City shall set the grade for driveways.
(2) The base must be smooth and consist of undisturbed or compacted earth. Stone, gravel, limestone screenings, or non-settling material, approved by the Building Department, may be used as a leveling course. Excavations or trenches under a drive must be filled and compacted with a non-settling material.
(3) The sub-grade or base shall be dampened, if dry, before pouring.
(b) Placing Concrete.
(1) Foundation beds shall be sprinkled immediately prior to depositing of concrete. Ready-mixed concrete shall be rapidly deposited in the work, and any concrete not in final position within thirty minutes after completion of the mixing shall not be used.
(2) Concrete shall be continuously deposited between bulkheads to a uniform thickness and to the full depth and width of the forms. The concrete, shall be thoroughly and sufficiently compacted to properly imbed the coarse aggregate and brought to the proper pitch and grade with a template or straight edge to produce concrete uniform in appearance, density and composition.
(3) No concrete showing segregation of materials shall be deposited in the work.
(c) Time of Pour.
(1) Where the temperature in the surrounding area is below seventy degrees Fahrenheit, the maximum allowable time from loading to pour shall be one and one-half hours.
(2) Where the temperature in the surrounding area is above seventy degrees Fahrenheit, the maximum allowable time from loading to pour shall be one hour.
(3) When concrete is placed at or below an atmospheric temperature of forty degrees Fahrenheit, or whenever the predicted temperature will fall below forty degrees Fahrenheit within the curing period, the water, aggregates, or both, shall be heated and suitable enclosures and heating devices shall be provided for and during the curing process.
(d) Finishing and Curing.
(1) Calcium or other admixtures shall not be added at the job site.
(2) Minimum floating and finishing shall be required. A broom or trowel finish shall be required. Finishing must be delayed until water sheen (bleed water) has disappeared from the surface. All finishing shall be in accordance with the American Concrete Institute guidelines.
(3) Curing compound shall be applied immediately after finishing, without damaging the surface, according to the manufacturer's recommendation. The compound shall be applied uniformly by means of an approved pressure spray distributor at the rate of one gallon to each two hundred square feet of surface, and it shall be so applied that the concrete surface is completely coated and sealed at one application.
(4) Curing may also be accomplished by "ponding". That is keeping the concrete continuously moist by spraying, soaking, or covering it with polyethylene or other non-porous sheeting. This process shall be maintained for a period of seven (7) days for regular concrete or three days (3) for Type 3 High-Early concrete.
(e) Joints.
(1) Control joints, whether hand-tooled or sawn, shall be to a depth of one- quarter the thickness of the slab. The dimension of any control joint panel shall not exceed ten feet.
(2) Isolation joints shall be required where concrete abuts any structure, including, but not limited to, foundations, garage floors, stoops and paved streets.
(3) Expansion joints. Prepared strips of premoulded fiber expansion material shall be one-half inch in thickness and of sufficient width to extend the entire depth of the concrete and shall be placed in such a manner that the joint will be filled to within one-half inch of the finished surface of the wale.
The edges of all joints so placed shall be rounded as hereinbefore specified.
(Ord. 69-2005. Passed 7-11-05.)