A. Materials:
1. Structural Concrete: Structural concrete shall conform to the requirements of section 03310, in appendix A to ordinance 190, on file in the office of the city clerk-treasurer.
2. Reinforcing Steel: Reinforcing steel shall conform to the requirements of section 03210, in appendix A to ordinance 190, on file in the office of the city clerk-treasurer.
3. Preformed Expansion Joint Material: Joint material shall comply with the requirements of AASHTO M-213, in appendix A to ordinance 190, on file in the office of the city clerk-treasurer.
B. Construction Methods:
1. General: Sidewalks and driveway approaches, either new or replacement, valley gutters and curbturn fillets shall be constructed at the locations shown on the permit application.
2. Subgrade Preparation: Excavation for the construction shall be to the required depth, and the subgrade upon which the concrete is to be placed shall have a firm and even surface, and shall be compacted as called for in section 02230, in appendix A to ordinance 190, on file in the office of the city clerk-treasurer. (Ord. 13.24; amd. 2006 Code)
3. Erecting Forms:
a. Forms, wood or steel, shall be staked securely in place, true to line and grade.
b. Sufficient support shall be given to the form to prevent movement in any direction, resulting from the weight of the concrete or the concrete placement. Forms shall not be set until the subgrade has been compacted within one inch (1") of established grade. Forms shall be clean and well oiled prior to setting in place. When set, the top of the form shall not depart from grade more than one-fourth inch (1/4") when checked with a ten foot (10') straightedge. The alignment shall not vary more than one-half inch (1/2") in ten feet (10'). Immediately prior to placing the concrete, forms shall be carefully inspected for proper grading, alignment and rigid construction. Adjustments and repairs as needed shall be completed before placing concrete.
4. Placing Concrete:
a. The subgrade shall be properly compacted and brought to specified grade before placing concrete. The subgrade shall be thoroughly dampened immediately prior to the placement of the concrete. Concrete shall be spaded and tamped thoroughly into the forms to provide a dense, compacted concrete free of rock pockets. The exposed surfaces shall be floated, finished and broomed.
b. The rate of concrete placement shall not exceed the rate at which the various placing and finishing operations can be performed in accordance with these specifications.
5. Stripping Forms And Finishing:
a. Removal Of Forms: Forms may be removed on the day following pour if the concrete is sufficiently set that removal will be without danger of chipping or spalling. When forms are removed before the expiration of the curing period, the edges of the concrete shall be protected with moist earth, or sprayed with curing compound. All forms shall be cleaned, oiled and examined for defects before they are used again.
b. Broomed Finish: The surface of concrete shall be finished true to the lines and grades shown on the plans. Concrete shall be worked until the coarse aggregate is forced down into the body of the concrete and no coarse aggregate is exposed. The surface shall then be floated with a wooden float to a smooth and uniform surface. When the concrete has hardened sufficiently, the surface shall be given a broom finish. The broom shall be an approved type. The strokes shall be square across the concrete from edge to edge with adjacent strokes overlapped. Strokes shall be made without tearing the concrete. The broomed finish shall produce regular corrugations not over one-eighth inch (1/8") in depth.
6. Curing: Curing shall be in accordance with good construction practice.
7. Joints:
a. Preformed expansion joints shall be installed at the locations shown in the standard details.
b. Contraction joints shall be provided between expansion joints at the intervals noted in the standard details.
8. Backfill:
a. In areas where lawns exist, the top four inches (4") of backfill bringing it level up to the top of the sidewalk or driveway shall be black loam or good topsoil which is suitable for the growth of lawns. It shall be placed out from the sidewalk or driveway a sufficient distance and in amount to replace turf or lawn removed during installation. Backfill shall be completed by grading to match the existing lawn.
b. Where lawns do not exist, the top four inches (4") of backfill shall be impervious dirt and shall be placed to conform with the topical sections shown on the plans.
c. Backfill shall be compacted to prevent settlement, and the surface shall be leveled off to a neat appearing and free draining surface. (Ord. 13.24)
9. Tolerances: The work shall be performed in a manner which results in the item being constructed to line and grade, uniform in appearance and structurally sound. Items found with unsightly bulges, ridges, low spots or other defects shall be removed and replaced at the contractor's expense if the engineer or city superintendent considers them to be irreparable. Grade shall not deviate more than one-fourth inch (1/4"), and alignment shall not vary more than one-half inch (1/2") from plan elevation, grade or alignment. Tolerances may be checked by use of survey instruments, straightedges, or water puddling. (Ord. 13.24; amd. Ord. 2.32)