1. Areas to be paved or surfaced shall be clean with temporary pavement materials which are not a part of the permanent pavement, cold-mix asphalt, deleterious or unsuitable materials removed and disposed of.
2. Any existing pavement, surfaces, or walks which are not broken or cut along straight lines shall be cut along straight lines prior to pavement or walk replacement.
B. Subbase Preparation: Subbase 150 mm (6”) thick shall be provided in locations where pavement is to be placed on a material other than Special Backfill. Subbase shall meet the requirements of ODOT Section 306.
C. Pavement Replacement:
1. All pavements encountered with respect to base courses, surface courses, and thicknesses shall be replaced in kind. Finish elevations, lines, and grades of replacement pavement shall be the same as elevations, lines, and grades of pavement removed, unless otherwise shown on the drawings.
2. Bituminous Pavements:
(a) Unless otherwise shown on the drawings, the minimum section (excluding subbase) of any bituminous pavement shall be 200 mm (8”) compacted aggregate base (ODOT 703.01, Type A Aggregate Base), 75 mm (3”) hot asphalt concrete (HAC) base, and 50 mm (2”) HAC surface Type B.
(b) Alternate Section - Pavements with pavement thicker than 100 mm (4”): Unless otherwise shown on the drawings, the pavement shall be a full-depth section with a minimum of 100 mm (4”) HAC base plus additional depth to make up full-depth, plus 50 mm (2”) of HAC binder and 50 mm (2”) of HAC surface Type B.
3. Brick Pavements: In a brick surfaced street, unless specifically excepted and pending the structural adequacy of any remaining brick, the Contractor may remove all brick and enough base material to allow full width repaving using either a bituminous or concrete pavement;
or of providing a HAC base or binder for the full depth of the brick across the trench and then replace the entire street with 50 mm (2”) of HAC surface Type B.
4. Brick Base and Asphalt Surface: Unless otherwise shown on the drawings, for a street with a brick base and an asphalt surface, the replacement section shall be full depth asphalt from the bottom of the brick base to the top of the asphalt surface. The top 50 mm (2”) shall be HAC surface Type B.
5. Concrete Base and Asphalt Surface: Unless otherwise shown on the drawings, for a street with a concrete base and an asphalt surface, the replacement section shall be a new concrete base, not less than 150 mm (6”) thick with HAC base to within 50 mm (2”) of the existing grade and then 50 mm (2”) of HAC surface Type B.
6. Chip and Seal Pavement: Unless otherwise shown on the drawings, chip and seal pavements shall have 200 mm (8”) of compacted aggregate base and a processed bituminous coated aggregate pavement placed and rolled as specified in ODOT Section 402.
7. Gravel Pavement: Unless otherwise shown on the drawings, gravel pavement shall be replaced with 150 mm (6”) of compacted stone or gravel aggregate as specified in ODOT Section 403.
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D. RESERVED E. Curbs
1. The construction of curbs, combination curb and gutter, and integral curb and gutter shall be in accordance with these specifications and as shown on the plans and shall be in reasonably close conformance with the lines and grades shown on the plans or as directed by the Engineer.
2. Excavation for curbs shall be made to the required depth, and the subgrade or base upon which the curb is constructed shall be compacted to a firm, even surface to not less than 95%
of maximum dry density as determined in accordance with AASHTO T-99.
3. All curb and gutter shall consist of concrete (ODOT Class A, 6 sack, 3000 psi, water/cement ratio of 0.48, 1” to 3” Slump).
4. The curbs shall be constructed by the use of wood or metal forms; or, if accepted by the Engineer, the curb may be constructed using a curb slipform machine. Forms, if used, shall be straight, free from warped or bent sections, and shall extend for the entire depth of the curb and shall be securely held in place so that no deviation from alignment and grade will occur during placement of concrete. The concrete shall be consolidated by vibration or other acceptable methods. The top of the curb shall be floated smooth and the top outer corner rounded to a 6 mm (1/4”) radius.
5. The face, top, and gutter of curbs shall not have deviations or irregularities of more than 6 mm (1/4”) when checked with a 10-foot straightedge.
6. Construction joints shall be placed at 10-foot intervals, unless otherwise shown or directed by the Engineer. The joint shall be uniform, of 3 mm (1/8”) to 6 mm (1/4”) in width, and to a depth of approximately 60 mm (21/2”). The joint may be saw cut or formed by accepted removable strips providing a straight joint at right angles to the length of curb. Joints shall be filled with specified bituminous joint filler material. Construction joints shall be formed around all abutting structures such as inlets and shall be as specified previously.
7. As soon as possible after placing and finishing of concrete, the curbing shall be moistened and kept moist for three days, or cured with the use of a specified membrane compound.
8. If existing curb is to be removed and replaced with new curb or new curb extended from existing curb, the existing curb shall be removed to the nearest joint of suitable existing curb or as directed by the Engineer.
F. Lane Striping: Contractor shall stripe new paving with standard white road paint. Stripe width and spacing to match that of paving restored or replaced.
G. Protection:
1. Compacted aggregate subbase and surface shall be compacted true to line and grade and required density. Subbase shall be maintained until prime coat is placed. Surface shall be maintained until job is complete.
2. Vehicular traffic of any kind shall not be permitted on any bituminous course until the bituminous mixture has hardened sufficiently not to be distorted beyond specified tolerances. Foreign material which is on the surface of any course shall be removed before the course is rolled or any subsequent course is placed.
3. Traffic on concrete pavement or walks shall not be permitted until concrete has developed sufficient strength not to be marked or damaged. Vehicular traffic shall not be permitted on concrete until it has reached a compressive strength of 20 mPa (3,000 psi).
4. Damaged pavement and walks shall be repaired or replaced to the satisfaction of the Engineer.
H. Clean-up: Job site shall be cleaned up following pavement and surfacing restoration. All rubbish, excess materials, temporary structures, and equipment shall be removed the work left in a neat and presentable condition.
2206 RIPRAP
2206.1 DESCRIPTION
This section shall govern the furnishing and installation of riprap upon a prepared surface to a grade and thickness shown or established by the Engineer.
2206.2 DEFINITIONS
A. Riprap: Placed protective material consisting of broken stone or concrete.
B. Dumped Riprap: Riprap emptied out of a vehicle unloaded or dropped in a large mass.
C. Revetment Riprap: Riprap placed to retain a wall of earth with a layer of stone.
D. Hand-laid Riprap: Riprap placed by hand rather than by mechanical means.
2206.3 MATERIALS
A. Dumped Riprap: Dumped riprap shall consist of broken concrete, masonry, or stone removed from an old structure; broken pieces removed from concrete pavement, base, or monolithic brick pavement; and broken rock from a fragmented stone or a solid rock excavation.
B. Revetment Riprap
1. The gradation of the riprap shall be such that:
(a) No individual piece weighs more than 120 pounds.
(b) 90-100% of the material passes a 300 mm (12”) sieve.
(c) 20-60% of the material passes a 150 mm (6”) sieve.
(d) Not more than 10% of the material passes a 37 mm (1½”) sieve.
C. Hand-laid Riprap: Hand-laid riprap aggregate shall consist of pieces, except spalls, no less than 0.28 cubic meter ( 9.89 ft3) in volume and no less than 75 mm (3”) in the least dimension. The width of these pieces shall be no less than 150 mm (6”) for 150 mm (6”) hand-laid nor less than 300 mm (12”) for 300 (12”) hand-laid riprap.
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