417COLD PLANING BITUMINOUS SURFACES

New Hampshire Department of Transportation Standard Specifications – 2016 Description

1.1This work shall consist of the removal of existing bituminous pavement, by planing or milling type equipment, to the depth

and grade shown on the plans or ordered.

1.2This work shall consist of constructing Rumble Strips by making depressions into bituminous pavement to the depth and

dimensions shown on the plans and as specified below. 1.2.1 This work shall also consist of removing existing rumble strips and inlaying pavement in the removed area. The intent is to inlay within a short period of time after planing the existing rumble strip. Materials

2.1The asphalt mix to inlay the removed rumble strip shall consist of a 3/8”, 75 gyration N design mix.

Construction Requirements

3.1Equipment

3.1.1 Equipment used for planing of bituminous surfaces shall be a power-operated rotary planing or milling machine capable of producing a finished profile gr ade and cross slope to within 1/4” of the depth specified and shall produce a uniform surface texture, free from gouges and ridges, greater than 3/8”. Surface tolerance will be tested with a 10-foot straight edge. The variation of the top of the ridges from the straight edge between any two ridge contact points shall not exceed 3/8 ”. 3.1.2 Equipment for milling new rumble strips sh all consist of a rotary type cutting head with a maximum outside diameter of 24” and a length of 16” or 12” The cutting head shall have cutting tips arranged in such a pattern as to provide a relatively smooth cut (approximately 1/16” between peaks and valleys). The cutting head(s) shall be on its own independent suspension from that of the power unit to allow the tool to self -align with the slope of the shoulder and/or any irregularities in the shoulder surface. The cutting tool shall be equipped with guides to provide consistent alignment of each cut in relation to the roadway and to provide uniformity and consistency throughout the project. Equipment that tears, distorts or otherwise damages the pavement adjacent to the milled depression will not be allowed. 3.1.3 The equipment shall be capable of accurately establishing profile grades by an automatic grade control system referencing from either the existing pavement or from an established independent grade line. The automated system shall be capable of averaging the existing grade or profile over a minimum of 30 feet, or be equipped with a sonic non-contact system with a minimum of two referencing stations mounted on the machine at a minimum length of 24 feet apart. Cross slope shall be established by an automated slope control mechanism. On projects or parts of projects where the Engineer deems that the use of automated controls are impractical, use of some or all of the controls listed above may be waived. Vacuum trucks or street sweepers shall be used to clean the milled surfaces. Cleaning shall continue until the surfaces are free of all material which may interfere with the bond between the applied tack coat and the milled surface. 3.1.3.1 The equipment shall have an effective means for controlling dust.

3.2When performing night operations, the Contractor shall provide sufficient lighting at the work site to ensure the same degree

of accuracy in workmanship and conditions regarding safety as would be obtained in daylight.

3.3Constructing Rumble Strips.

3.3.1 Rumble strips shall not be constructed until 30 days after placement of new hot bituminous pavement, unless authorized by the Engineer. The depressions shall have a concave circular shape with a minimum 1/2” depth at the center and 5/8” maximum depth. Rumble strips shall be placed in the roadway according to the patterns and dimensions shown on the plans. 3.3.2 Shoulder rumble strips shall be milled 16” in length measured perpendicular to the direction of travel. 3.3.3 Centerline rumble strips shall be milled 12” in length, measured perpendicular to the direction of travel, or as directed in the plans.

3.4Removal of Rumble Strips. Existing centerline and shoulder rumble strips scheduled for overlay shall be removed to

eliminate their effects on the new pavement surface. Rumble strips shall be removed by milling a nominal depth of 1”.

3.5Milled material not designated for salvage shall become property of the Contractor and shall be removed and disposed of in

an approved manner.

3.6Prior to reopening the area to traffic, all equipment shall be removed to a location where it does not present a hazard to traffic

and the pavement shall be cleaned by sweeping or flushing. New Hampshire Department of Transportation Standard Specifications – 2016

3.7Asphalt Inlay of Rumble Strip Area. The milled area of removed rumbles shall be inlayed to match the existing pavement

surface with hot bituminous pavement (placed by machine). The placement method shall be capable of spreading the mixtures with a finish that is smooth, uniform in density and texture, and free from hollo ws, tears, gouges, corrugations, and other irregularities.

3.8Compaction shall not have a specific method or compaction requirement, but shall follow the general practices of 401.3.12 .

Compaction efforts shall be prov ided by vibratory rollers having a minimum weight of three tons. Pneumatic rollers are not required. Method of Measurement

4.1Cold planing bituminous surfaces, as shown on the plans or as ordered, will be measured by the square yard as determined

by the actual surface measurements of the lengths and widths of the bituminous areas removed. 4.1.1 The nominal depth of material removed will be as shown on the plans.

4.2Rumble strips; and remove and inlay existing rumble strips will be measured by the linear foot to the nearest one tenth of a

foot. Basis of Payment

5.1The accepted quantities for cold planing bituminous surfaces to the nominal depth specified will be paid for at the contract

unit price per square yard.

5.2The accepted quantity for rumble strips; and remove and inlay existing rumble strips , will be paid for at the contract unit

price per linear foot.

5.3Project lighting or overtime required due to night operations will be subsidiary to the cold planing.

Pay item and unit: 417. Cold Planing Bituminous Surfaces Square Yard

417.19Cold Planing Bituminous Surfaces (Night) Square Yard

417.412 Rumble Strips, 12” Wide Linear Foot

6 Rumble Strips, 16” Wide Linear Foot

417.4XX9 Rumble Strips, XX” Wide (Night) Linear Foot

417.53Remove and Inlay Existing Rumble Strips Linear Foot

New Hampshire Department of Transportation Standard Specifications – 2016

Description

This work shall consist of the design, furnishing or obtaining, construction, maintenance and removal of a temporary

bridge(s) and, if specified, the approaches to the temporary bridge meeting the requirements shown on the plans or contained herein. The work shall also include the design and construction of temporary abutments an d piers, as required, bridge rail, connection to portable concrete barrier or temporary guardrail, and furnishing all equipment to install and dismantle the temporary bridge. The limits of the available work area shall be as indicated on the plans or as p ermitted. Materials

All materials to be used in the construction of the temporary bridge shall be subject to inspection and approval by the Engineer

prior to their incorporation into the work. Used material will be acceptable, provided appropriate allowances are made for their condition. 2.1.1 Steel sheet piling shall conform to Section 506. 2.1.2 Steel bearing piles shall conform to Section 510. 2.1.3 Concrete shall conform to Section 520. 2.1.4 Reinforcing steel shall conform to Section 544. 2.1.5 Structural steel shall conform to Section 550. 2.1.6 Structural timber shall conform to Section 568. 2.1.7 Bridge rail shall be galvanized steel conforming to Section 563.2.

2.2The Contractor shall provide the temporary bridge incorporating one of the following sources:

Acrow Corporation of America, Maybe Bridge, Inc., or equal subject to approval by the Department, Contractor supplied, purchased or leased under separate agreement.

decking, Contractor supplied and constructed. Construction Requirements

Unless otherwise specified on the Plans, the temporary bridge, including the rail system and substructures shall meet the

minimum strength requirements of an HL -93 design loading and pedestrian loading as required and specified in the AASHTO “ LRFD Bridge Design Specifications”. The bridge, including superstructure, rail system, and substructures shall be designed by a Licensed Professional Engineer. 3.1.1 Detailed plans, showing sizes, arrangement, and quality of the materials to be used in the construction and calculations of the proposed temporary bridge shall be stamped with the seal of the Licensed Professional Engineer, signed and submitted f or documentation to the Engineer in accordance with 105.02. Submitta ls shall also include an erection plan describing the method of erection proposed and the amount and character of equipment proposed. Plans shall be documented and authorization to proceed with construction shall be obtained before construction is started . The Engineer responsible for design of the superstructure shall provide a stamped and sealed NHDOT rating form (Form 4) showing the moment and shear capacities of all structural components (such as slab, decking, girders, stringers, transoms, and/or trus ses) for single lane and multiple lane loading (contact Bureau of Bridge Design (603) 271-2731 for copy of the form). The components shall be reported in HS tons using the HS-Truck portion of the HL-93 load, for multiple lane and single lane loaded conditions, load distribution, and load and resistance factors based on AASHTO Manual For Bridge Evaluation Load and Resistance Factor Rating Methods. As provided in 105.02, such documentation shall not relieve the Contractor from any responsibility under the Contract. 3.1.2 When more than one Engineer is responsible for the design of separate components of the temporary bridge (i.e. substructure and superstructure), the Contractor shall make one submittal for documentation co ntaining all portions of the temporary bridge unless otherwise allowed.

The temporary bridge shall have a minimum clearspan length as shown on the plans. The minimum low steel elevation with

provisions for any anticipated sag and dead load deflections shall be maintained as noted in the Contract plans.

The temporary bridge and approaches shall be designed to accommodate the free passage of vehicles, including snowplows,

for either one-way, two-way, or pedestrian traffic as specified on the Plans. The bridge shall provide for a clear width as shown on the plans.