413HOT-POURED CRACK SEALANT

New Hampshire Department of Transportation Standard Specifications – 2016 Description

1.1This work shall consist of filling the major cracks in the pavement with an approved sealant material. The cracks to be filled

will be those designated by the Engineer. Materials & Equipment

2.1Material shall be of the hot-poured type and be a product as included on the Qualified Products List.

2.1.1 Material not covered by an asphalt pavement overlay shall meet the requirements of ASTM D6690 Type II. 2.1.2 Material covered by an asphalt pavement overlay shall be low modulus conforming to ASTM D6690 Type IV except cone penetration shall be 110-150.

2.2Equipment shall meet the approval of the Engineer and shall be maintained in good working condition at all times.

pressure at the nozzle. The compressor shall be equipped with traps that maintain the compressed air free from oil and water. Filters shall be inspected daily to ensure that they are still effective and not saturated with oil and moisture. Saturated and/or damaged filters shall be replaced.

shall be equipped with a metal shield beneath the firebox to protect the pavement. The space between the inner and outer shells shall be filled with a suitable heat transfer oil or substitute having a flash point of not less than 530 °F. The kettle shall be equipped with a satisfactory means for agitating the joint sealer to maintain a uniform temperature. This may be accomplished by co ntinuous stirring with mechanically operated paddles or by a continuous circulating gear pump attached to the heating unit, or by both paddles and a pump. Kettles equipped with rocking type agitation shall not be used. The kettle shall be equipped with a thermostatic control calibrated between 200° and 550°F.

cracks to be filled to refusal.

that does not allow the flame to touch the pavement.

operator and allows the operator to control the flow of material. A device shall be mounted to bypass material into the holding tank if the applicator nozzle is shut off. Construction Requirements

3.1All cracks greater than 1/8 ” up to 3/4” in width shall be shaped with a power router to a dimension of 3/4 ” +1/8” wide by

5/8” deep rectangular shape and treated unless otherwise directed. Cracks greater than 3/4” shall be treated but not routed. Router bits will be maintained to ensure that rectangular dimensions are achieved. A rounded shape will not be allowed.

3.2All cracks ordered treated shall be hot-air lance cleaned of dirt, foreign material, and loose edges.

3.3The material removed from the cracks shall be removed from the roadway surface prior to reopening the roadway to traffic.

3.4The hot-poured sealant shall be maintained in the kettle and applied at the temperature range specified by the manufacturer.

The Contractor shall furnish the Engineer with copies of the manufacturer’s literature indicating the application temperature range.

3.5The hot-poured sealant shall be applied to the cracks using hand pouring pots or wand applicators within 2 minutes following

hot-air lance cleaning. Only wand applicators shall be used for crack filling when cracks are not covered by an asphalt pavement overlay.

3.6All cracks to be treated shall be filled to 1/16” to 1/8” below the pavement surface with hot -poured sealant with the sealant

left slightly concave. Filling flush, overfilling, and overbanding of cracks will not be allowed. Sealant shall tightly bond to the pavement. The sealant bond to the pavement shall be checked after it has sufficiently cooled. If the sealant do es not bond to the pavement, sealant shall be removed and crack sealing operations discontinued until debonding problem is corrected.

3.7No hot -air lance cleaning or crack sealing shall be performed when the pavement and cracks are wet or the ambient

temperature is below 50°F.

3.8All work shall be performed in a neat manner. The sealant shall be allowed to cool sufficiently to prevent lifting, sticking ,

and tracking prior to returning the pavement segment to traffic.

3.9The contents of the kettle shall be emptied at the end of each day and shall not be reused.

New Hampshire Department of Transportation Standard Specifications – 2016 Method of Measurement

4.1Hot-poured crack sealant will be measured by the pound of material incorporated in the work.

Basis of Payment

5.1The accepted quantity of hot-poured crack sealant will be paid for at the contract unit price per pound, complete in place.

5.2Cleaning and routing will be subsidiary.

Pay item and unit:

413.1Hot-Poured Crack Sealant Pound

413.2Hot-Poured Crack Sealant (Low Modulus) Pound

New Hampshire Department of Transportation Standard Specifications – 2016

Description

This 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

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

Construction Requirements

Equipment

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.

When 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.

Constructing 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.

Removal 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”.

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

an approved manner.

Prior 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.