9−15905.05.2 Bituminous Concrete Sidewalks and Driveways. The accepted quantities of "Bituminous Concrete Sidewalks and Dr iveways" will be paid for at the contract unit price per ton as listed in the Proposal. A maximum 10 percent overrun of the calculated quantities based on the required thickness as shown on the Plans is permissible in accordance with the provisions of Subsection 401.04.1(b) of these Specifications. The price so-stated constitute s full and complete compensation for all labor, materials and equipment, and all incidentals required to finish the work, complete and accepted by the Engineer. Excavation and gravel borrow subbase will be paid for separately under appropriate work items.
906.01 DESCRIPTION. This work consists of the construction of curbing on prepared gravel
bases and/or the construction of bituminous berm on underlying pavement courses at the locations indicated on the Plans or as directed by the Engineer, all in accordance with these Specifications. 906.01.1 Types of Curbing . The following types of curbing are designated as follows:
a.Granite Curbing.
b.Precast Concrete Curbing.
c.Bituminous Curbing. d. Bituminous Berm.
e.Remove Handle, Haul, Trim and Reset Curbing and Edging, Straight and/or Circular. All Types.
906.02 Materials.
906.02.1 Granite Curbing. Granite curbing shall conform to the requirements of Subsections
M.09.01 and M.09.02; Granite Curb for Roadways and Granite Slope Curbing for Roadways , respectively, of these Specifications. 906.02.2 Precast Concrete Curbing. Concrete for curbing shall be Class Z(AE) and shall conform to the applicable requirements of SECTION 601; PORTLAND CEMENT CONCRETE , of these Specifications with the following exceptions.
a.Job Mix Formula. The Contractor shall submit for approval a job-mix formula for the concrete mix design in accordance with the provisions of Subsection 601.03.1; Proportioning , of these Specifications.
b.Tolerances. Precast concrete curbing, apron stones, inlets and related concrete curb 9−16 products shall conform to the dimensions shown on t he Plans. Said dimensions shall fall within the following tolerances: Dimension Tolerance ± W i d t h 1 / 4 " H e i g h t 1 / 2 " Length 3/4" Surface Profile 1/8" Details and dimensions shall be true and square. The tolerance allowance on each precast element shall not relieve the Contractor from obtaining a suitable configuration of the various installed products.
906.02.3 Bituminous Curbing. Bituminous material for curbing shall conform to the requirements
of Subsection M.09.04 of these Specifications.
906.02.4 Bituminous Berm. Bituminous material for berm shall conform to the requirements for
Class I-1 Surface Course as set forth in Subsection M.03.01 of these Specifications. Tack coat shall conform to the requirements for emulsified asphalt as set forth in Subsection M.03.03.4 of these Specifications. Highway joint sealant material shall be as listed in the Department's Approved Materials List. 906.02.5 Gravel Borrow shall conform to the requirements of Subsection M.01.02 of these Specifications. 906.03 CONSTRUCTION METHODS.
906.03.1 Granite Curbing.
a.Excavation. Excavation shall be made to the dimensions shown on the Plans or as directed by the Engineer to a sufficient width and depth to allow for the proper trimming and fine grading and compaction of a gravel subbase course. The gravel subbase upon which the curbing is to be set shall be compacted to a firm, even surface. All soft and unsuitable material shall be removed and replaced with gravel borrow material. Gravel borrow shall be placed in layers not exceeding 6 inches in depth before compaction. Each layer shall be compacted to 95 percent of maximum density (AASHTO T-180) by means of a vibratory compactor of size and type approved by the Engineer.
b.Installation. The curbing shall be set such that the front top arris line conforms to the required line and grade.
b.Joints. Curbing units shall be placed end-to-end as close as possible. No more than ½-inch opening shall show for the full width of the top and the top 8 inches of the vertical joint. Backfilling. After the curbing has been set, any remaining excavated areas shall be backfilled with approved material and thoroughly compacted back and front to grade. Methods of compaction shall preserve the line and grade of the curbing.
906.03.2 Precast Concrete Curbing. The construction of precast concrete curbing shall conform
to the requirements of Subsection 906.03.1 , above. 9−17
906.03.3 Bituminous Curbing.
a.Excavation. Excavation shall conform to the requirements of Subsection 906.03.1; Para. a , above.
b.Preparation of Bed. When curbing is to be constructed on a fresh laid bituminous surface, that surface must first be cleaned.
c.Installation. Bituminous curbing shall be constructed by use of a self-propelled automatic curber or curb machine, or a paver equipped with curbing attachments. The automatic curber or curb machine shall be approved by the Engineer prior to its use. The machine shall conform to the following requirements:
1.The weight of the machine shall be such that required compaction is obtained without the machine riding above the bed on which curbing is constructed.
2.The machine shall form curbing that is uniform in texture, shape and density.
3.The Engineer may permit the construction of curbing by means other than the automatic curber when either short sections, or sections with short radii, are required or for other reasons as may be warranted. The curbing produced by such alternate means shall conform in all respects to the curbing produced by the use of the machine.
d.Painting and Sealing. Painting and/or sealing shall be applied only on curbing which is clean and dry and which has reached the ambient temperature. 906.03.4 Bituminous Berm. The bituminous berm shall be placed on the underlying pavement course in accordance with either Method A or B as described below. Method A. The berm is placed at the same time as the asphalt surface course in one operation. The underlying pavement shall be broom cl eaned and tacked prior to placement. The bituminous berm will be placed in one lift and will be compacted by a smooth steel wheel roller of a type and weight acceptable to the Engineer. Method B. The berm is placed independent of the asphalt surface course placement. The berm shall be founded entirely on the base course. Any adjacent surface course shall be saw cut as required to form a true and even edge. The portion of the base course on which the berm is to be placed as well as any vertical saw cut edge shall be cleaned to the satisfaction of the Engineer and covered with an approved bituminous tack coat. The berm shall be placed in one layer and shall be compacted by a smooth steel wheel roller of a type and weight acceptable to the Engineer. After the berm is placed, the joint between the berm and the existing pavement shall be sealed with an approved highway joint sealant.
906.03.5 Remove, Handle, Haul, Trim, and Reset Curbing and Edging, Straight and/or
Circular, All Types. The existing curbing or edging shall be carefully removed to minimize damage to said units and adjacent pavement or sidewalks. The curbing or edging will then be handled, 9−18 hauled and stockpiled as required. The individual units shall be trimmed and cut as necessary so that the ends are squared, the joints of the installed curbing or edging are tightly butted and no more than a ½-inch opening shall show at the full width of the top and the top 8-inches of the vertical joint. All curbing or edging shall be thoroughly cleaned prior to resetting. The construction of reset curbing and edging, straight and/or circular, shall conform to the requirements of Subsection 906.03.1 above. The Contractor shall replace with new material any existing curbing or edging that is to be reset which is lost, damaged, or destroyed as a result of either its construction operations or failure to properly store and protect said units, all at no additional cost to the State.
906.04 Method of Measurement.
906.04.1 Granite Curbing. "Granite Curb-Straight" and "Granite Curb-Circular" will be measured
(along the front face of the section at the finished grade elevation) by the number of linear feet of such curbing actually installed in accordance with the Plans and/or as directed by the Engineer. "Granite Curb Corners,” "Granite Curb Transitions,” "Granite Curb Apron Stones,” "Granite Curb Inlet Stones," "Granite Curb Wheelchair Ra mp Transition" and “Grani te Ramp Stones” will be measured by the number of each such units actually installed in accordance with the Plans and/or as directed by the Engineer.
906.04.2 Precast Concrete Curbing. "Precast Concrete Curb-Straight" and "Precast Concrete
Curb-Circular" will be measured (along the front face of the section at the finished grade elevation) by the number of linear feet of such curbing actually installed in accordance with the Plans and/or as directed by the Engineer. "Precast Concrete Curb Corners,” and "Precast Concrete Curb Transitions,” "Precast Concrete Curb Apron Stones," "Precast Concrete Curb Inlet Stones," "Precast Concrete Curb Wheelchair Ramp Transition, Stones" and “Precast Concrete Ramp Stones” will be measured by the number of each such units actually installed in accordance with the Plans and/or as directed by the Engineer.
906.04.3 Bituminous Curbing. "Bituminous Curbing" will be measured (along the front face of the
section at the finished grade elevation) by the num ber of linear feet of such curbing actually installed in accordance with the Plans and/or as directed by the Engineer. Deduction in length will be made for the presence of drainage structures installed along the curbline such as catch basins, drop inlets, etc.
906.04.4 Bituminous Berm. "Bituminous Berm" will be measur ed by the number of linear feet
actually installed in accordance with the Plans and/or as directed by the Engineer.
906.04.5 Remove, Handle, Haul, Trim, and Reset Curbing and Edging, Straight and/or Circular, All Types. "Remove, Handle, Haul, Trim and Re set Curbing and Edging, Straight and/or
Circular, All Types" will be measured (along the front face of the section at the finished grade elevation) by the number of linear feet of such cu rbing reset in accordance with the Plans and/or as directed by the Engineer. "Curb Corners,” "Curb Transitions,” "Apron Stones,” "Inlet Stones,” "Curb Wheelchair Ramp Transition Stones" and “Ramp Stones” will be measured (along the front face of the section at the finished grade elevation) by the number of linear feet of such curbing reset in accordance with the
Source: Rhode Island Standard Specifications (Bluebook), 2024 Edition. Pages 547–550 of 826.