411PLANT MIX SURFACE TREATMENT

New Hampshire Department of Transportation Standard Specifications – 2016 Description

1.1This work shall consist of a leveling course when ordered and one or more courses of bituminous mixture constructed on an

existing pavement.

1.2This work when specified shall consist of a dual purpose single course bituminous mixture which acts as a shim course and

a wearing course constructed on an existing pavement. Materials

2.1Materials and their use shall conform to the requirements of 401.2 as amended below:

2.1.1 Asphalt binder PG grade to be used for a particular project will be specified in a Special Provision contained in the Proposal. 2.1.2 Unless a volumetric mix design has been p erformed by the Contractor, the composition of the mixtures shall conform to historical gradation and binder content. Leveling course, AC Paver Shim, Paver Spot Drag Shim, and 3/4” PMST shall be Type H unless otherwise noted.

Table 411-1 - Composition of Mixtures - Master Ranges Plant Mixed Surface Treatment Type H 3/8” Sieve Size Percentage by Weight Passing Min Desired Max 3/8” 95.0 100 100 No. 4 70.0 77 84.0 No. 8 54.0 59 65.0 No. 16 35.0 43 51.0 No. 30 20.0 28 36.0 No. 50 10.0 15 20.0 No. 100 5.0 8 11.0 No. 200 2.0 4 6.0 Percentage of Total Mix Asphalt Cement 6.25 6.7 7.25

2.1.3 Blotter materials shall be sand conforming to the requirements of Table 411-2. Table 411-2 -- Blotter Material Sieve Size Percent by Weight Passing No. 4 100 No. 10 70 - 92 No. 200 0 - 6 Construction Requirements

3.1Mixing plants shall be as prescribed in 401.3.1.

3.2Mixing and storage shall conform to 401.3.1.6.11, 401.3.6, and 401.3.7 with the following modifications:

3.2.1 If the aggregate contains sufficient moisture to cause foaming in the mixture, it shall be re moved from the bins. The quantity of cold aggregate fed to the dryer shall be governed by the ability of the dryer to remove the moisture completely f rom the aggregate, as determined by the Engineer.

3.3Weighing and hauling shall conform to 401.3.8.

3.4Placing shall conform to 401.3.10 with the following modifications:

New Hampshire Department of Transportation Standard Specifications – 2016 3.4.1 The existing pavement shall be thoroughly dry and free from all dust, dirt, and loose material. Sweeping with a power broom supplemented by hand brooming may be required. 3.4.2 Existing pavement shall be treated with tack coat as prescribed in 410.3.4. When ordered, the existing pavement shall be treated as prescribed in 410.3.3. 3.4.3 A leveling course of hot bituminous concrete may be ordered to prepare the pavement for the finish course. 3.4.4 Any material delivered to the paver having a temp erature lower than 26 0° F shall not be us ed unless modified by a qualified warm mix technology capable to being compacted to project requirements at the recommended delivery temperature. 3.4.5 In those areas where the edges of the pavement are adjacent to paved or bituminous treated shoulders, the asphalt paving machine shall be equipped to produce a feathered edge, parallel to the direction of traffic, and a uniform longitudinal line shall be maintained at the outer edge of the applied pavement. 3.4.6 All bridges included within the limits of the work shall be treated curb to curb. 3.4.7 When AC Paver Shim is specified, in areas of extreme deformation of the existing roadway, some amount of dragging is expected in placing this wearing course. 3.4.8 When Spot Drag Shims are specified, the intent is to fill and level localized ruts and deformations in the pavement. An 8’ paver shall be used. Spots to be shimmed will be marked out by the Engineer. The length and widths of the spots will var y. It is expected that in most cases the pavement marking stripes will not be covered. Each spot shall be tacked before paving. Edges of shimmed areas shall be feathered by the paver. Luting or squaring up the ends of each spot will not be required.

3.5Compaction shall conform to 401.3.12 with the following modifications:

3.5.1 If necessary to prevent traffic pickup of the mixture, the surface of the work shall be given a light dusting of blotter material just prior to rolling with a pneumatic -tired roller. The surface shall be maintained thereafter by occasional back sanding and rolling as directed. 3.5.2 When more than 125 tons of mixture are being placed per hour, an additional steel -wheeled roller will be required. 3.5.3 Excess blotter material remaining on the pavement and on paved shoulders shall be removed prior to acceptance of the project. 3.5.4 After rolling has been completed, the edges of the pavement shall be trimmed as directed to secure a uniform line.

3.6The finished surface of the pavement shall be unifor m in appearance, shall be free from irregularities in contour, and shall

present a smooth-riding surface. Method of Measurement

4.1Plant mix surface treatment will be measured as prescribed in 401.4.

4.2Blotter material used on plant mix surface treatment will be subsidiary.

Basis of Payment

5.1The accepted quantities of leveling course and plant mix surface treatment will be paid for at the Contract unit price per to n,

complete in place. 5.1.1 Tack coat material required under 3.4.2 will be subsidiary to the leveling course and plant mix surface treatment items. Pay items and units:

411.1Hot Bituminous Concrete Leveling Course Ton

411.15Hot Bituminous Concrete Leveling Course, Aggregate 50 Percent Wear Ton

411.19Hot Bituminous Concrete Leveling Course (Night) Ton

411.3Plant Mix Surface Treatment (AC), Paver Shim Ton

411.43Plant Mix Surface Treatment(Asphalt Cement), 3/8 in Ton

411.46Plant Mix Surface Treatment(Asphalt Cement), 3/4 in Ton

411.51Plant Mix Surface Treatment, Paver Spot Drag Shim Ton

New Hampshire Department of Transportation Standard Specifications – 2016

Description

This 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

Material 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

All 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.

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

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

The 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.

The 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.

All 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.