466ASPHALT PAVING INTERLAYER SYSTEM

466.1DESCRIPTION –This work is furnishing and placing a n asphalt paving interlayer system on an

existing pavement surface and before an overlay or construction of pavement layer as a waterproofing or stress relieving membrane interlayer or both.

466.2MATERIAL–

Type II. Provide a stable fiber, needle-punched, nonwoven material consisting of at least 85% by weight polyolefins, polyesters , or polyamides. The paving fabric must be resistant to chemical attack, rot and mildew, and have no t ears or defects that will adversely alter its physical properties. The fabric must be specifically designed for pavement applications and be heat -set on one side to reduce asphalt material bleed-through and to minimize fabric pick-up by construction equipment during installation.

glue or lightweight carrier fabric . The fiberglass mesh grid must be resistant to chemical attack, rot and mildew, and have no tears or defects that will adversely alter its physical properties. Grid must conform to the following performance properties:

inch. Test according to ASTM D6637.

together. Provide a composite of stable fiber, needle-punched, nonwoven material consisting of polyolefins, polyesters, or polyamides with mechanically reinforced bonded network of reinforced glass filaments. The composite grid must be resistant to chemical attack, rot and mildew and must have no tears or defects that will adversely alter its physical properties.

Test according to ASTM D6637.

64S-22 as modified in Bulletin 25 as specified in Section 702.

466.3CONSTRUCTION–

system manufacturer’s installation instructions to the Representative before installation. Ensure that a trained manufacturer’s technical representative is present during every phase of installation, unless applied by a factory trained licensed installer, provided by written approval from the material supplier. The manufacturer’s technical representative must provide training and technical assistance on surface preparation, equipment, method of application and finish.

meeting to discuss the following:

• Asphalt material or tack coat type, application width and application rate.

• Mixture acceptance.

• Cleaning the pavement surface.

• Review the process to lay the product in curves, busy intersections, and around utilities .

• Removal of all interlayer product that is not adequately adhered to the tacked pavement .

• Use asphalt material in areas where the product is not completely adhered, especially during the paving operation, where stopping to do any repairs is not possible.

• Identify slopes and sharp curves.

• Sequence of paving operations.

from outdoor weather elements during shipping and storage. Store asphalt paving interlayer system elevated off the ground and covered to protect it from damage, ultraviolet light, precipitation, chemicals, and sparks. The asphalt paving interlayer system must be labeled according to ASTM D4873. If the wrapping is damaged before installation, discard the outer wrap of material before installation.

asphalt paving interlayer system if weather conditions are not suitable for installation according to the asphalt paving interlayer system manufacturers recommendations and the Representative.

loose debris before placement of asphalt paving interlayer system. Seal cracks as specified in Section 469.3(d). Allow crack-filling material to cure before placement of the asphalt paving interlayer system. Repair potholes and other pavement distresses a s specified in Section 450. Perform repairs identified by the Representative. Place the asphalt paving interlayer system on a drainable surface with no depressions.

Hand spraying, squeegee and brush application may only be used in locations where the distributor truck cannot reach. Make every effort to keep hand application to a minimum. Apply asphalt material uniformly to the prepared, clean, dry pavement surface. Maintain the temperature of the asphalt material to allow a uniform spray pattern. For performance grade liquid asphalt binders, the minimum temperature is 290F. Asphalt material temperature must not ex ceed 320F to avoid damage to the asphalt paving interlayer system.

bonding of the geotextile fabric to the existing pavement surface. Apply asphalt material at a rate of 0.22 to 0.28 gallons per square yard as required to completely cover the roadway and as approved by the manufacturer’s technical representative. The target width of the asphalt material application is equal to the paving fabric width plus 6 inches on each side. Asphalt material application must be wide enough to cover the entire width of geotextile fabric overlaps. Apply asphalt material only as far in advance of geotextile paving fabric installation as is appropriate to ensure a tacky surface at the time of geotextile paving fabric placement. Do not allow traffic on the asphalt material. Clean excess asphalt material from the pavement.

surface area and as approved by the manufacturer’s technical representative. The rate could vary depending on the installation or surface conditions. The target width of the asphalt material application is

equal to the fiberglass mesh grid width plus 6 inches on each side. Asphalt material must be fully cured before allowing any construction traffic over the surface including paving.

and bond the composite reinforcing grid to the existing pavement surface. Apply asphalt material at a rate of 0.19 to 0.28 gallons per square yard as required by the roadway surface and as approved by the manufacturer’s technical representative. The target width of the asphalt material application is equal to the composite reinforcing grid width plus 6 inches on each side. Asphalt material application must be wide enough to cover the entire width of composite reinforcing grid overlaps. Apply asphalt material only as far in advance of composite reinforcing grid installation as is appropriate to ensure a tacky surface at the time of composite reinforcing grid placement. Clean excess tack coat from the pavement.

capable of providing a smooth installation with a minimum amount of wrinkling or folding. Brooming or rubber-tire rolling , or both is required to maximize asphalt paving interlayer system contact with the pavement surface. Turning of the paver and other vehicles must be done gradually and kept to a minimum to avoid movement and damage to the asphalt paving interlayer system. Avoid abrupt starts and stops to avoid damage to the asphalt paving interlayer system. Remove damaged asphalt paving interlayer system and replace with same type of asphalt paving interlayer system at no additional cost to the Department. Do not place asphalt paving interlayer reinforcement system on wet pavement.

cement cools and loses its tackiness. Do not install geotextile paving fabric in areas where the overlaid asphalt tapers to a minimum compacted thickness of less than 1.5 inches. Apply additional hand- placed asphalt material at overlaps and repairs identified by the Representative.

of the pavement must be between 40F and 140F. If grid is placed on a leveling course, the minimum thickness of the leveling course must be 2 times the Nominal Maximum Aggregate Size (NMAS) and must have a surface temperature less than 140F.

before the asphalt material cools and loses its tackiness. Do not install composite reinforcing grid in areas where the overlay asphalt tapers to a minimum compacted thickness of less than 1.5 inches. Additional hand-placed asphalt material may be required at overlaps and repairs identified by the Representative. Place composite reinforcing grid with the fabric side down on field applied asphalt material on existing pavement.

recommendations or a 1-inch minimum. Repair wrinkles 1 inch or larger, slice along the wrinkle and overlap the excess material flat. End joints and joints from repair of wrinkles must be made to overlap in the direction that the pavement overlay will be placed. No traffic except construction vehicles required for placement will be allowed to drive on the asphalt paving interlayer systems.

not have asphalt material must be corrected by manual placement of asphalt material or trimmed to a 1- inch overlap before overlay construction.

overlaps. Overlaps that do not have asphalt material must be corrected by manual placement of asphalt material or trimmed to a 1-inch overlap before overlay construction.

placement. Verify minimum asphalt material temperature with manufacturer’s technical representative and as identified in field QC Plan. All areas in which asphalt paving interlayer system has been placed must be paved during the same day. Blot excess asphalt material that bleeds through the asphalt paving interlayer

system by broadcasting sand on the paving fabric. Remove loose sand before beginning the paving operation. If rainfall on the asphalt paving interlayer system occurs before the placement of the asphalt overlay, the asphalt paving interlayer system must be allowed to dry before the asphalt overlay is placed. Overlay asphalt thickness must meet the requirements for the contract drawings and documents. The minimum compacted thickness of the first lift of asphalt overlay will not be less than 1.5 inches in areas of asphalt paving interlayer system installation.

466.4MEASUREMENT AND PAYMENT–Asphalt material will be incidental to the payment for the asphalt

paving interlayer system.