446.1 General Description
This work includes installing Type II pavement reinforcement fabric and high strength pavement reinforcement fabric over cracks, joints, and patches in existing asphaltic concrete pavement. Install the fabric in strips or full width before placing an overlay where shown on the Plans or as directed by the Engineer. Install high strength pavement reinforcement fabric on asphaltic concrete interstate projects.
446.1.01 Definitions
General Provisions 101 through 150.
446.1.02 Related References
A. Standard Specifications Section 150—Traffic Control Section 400—Hot Mix Asphaltic Concrete Construction Section 413—Bituminous Tack Coat Section 881—Fabrics B. Referenced Documents General Provisions 101 through 150.
446.1.03 Submittals
General Provisions 101 through 150.
446.2 Materials
Use the reinforcement fabric that meets the requirements of Subsection 881.2.06. Bituminous binder materials, when required, shall meet the requirements of Section 413, Bituminous Tack Coat.
446.2.01 Delivery, Storage, and Handling
General Provisions 101 through 150.
446.3 Construction Requirements
446.3.01 Personnel
General Provisions 101 through 150.
446.3.02 Equipment
A. Template When using fabric strips, use a template or other method satisfactory to the Engineer to apply the bituminous tack coat uniformly. B. Mechanical Device Use a mechanical device approved by the Engineer when placing the fabric full width on the pavement to ensure the fabric is placed smooth, free of wrinkles, and with no uplifted edges. C. Roller Place the fabric in total contact with the underlying pavement. Roll the fabric with a static drum or pneumatic roller to ensure adequate adhesion to the pavement surface.
446.3.03 Preparation
Before an existing pavement surface is milled, mark the location of joints and cracks with an offset reference so that they can be located after milling has been completed. A. Cleaning the Pavement Immediately before applying the bituminous tack coat, clean the pavement surface to remove rocks, dirt, debris, and other materials that may prevent a clean bonding surface. B. Repairing Potholes, Spalls, or Cracks Before placing the fabric, repair potholes, spalls, or cracks greater than 3/16 in (5 mm) wide. Repair spalls and potholes using asphaltic concrete that meets the requirements of Section 400 or other materials such as cold mixes approved by the Engineer. Fill cracks with PG 64-22 asphalt cement or other materials approved by the Engineer.
446.3.04 Fabrication
General Provisions 101 through 150.
446.3.05 Construction
Do not install reinforcement fabric when ambient temperatures are less than 45 °F (7 ºC). Use a bituminous tack coat when temperatures are between 45°F (7 ºC) and 70°F (21ºC) for all reinforcement fabric types. When ambient temperatures are a minimum of 70 °F (21 ºC) and rising, reinforcement fabric with a self-adhesive backing may be installed at the Contractor’s option without applying a bituminous tack coat except when the fabric is placed on a milled surface. Use a bituminous tack coat when fabric is placed on a milled surface regardless of the temperature. A. Applying Bituminous Binder Use a bituminous tack coat to bond self-adhesive fabric to the pavement and apply the bituminous tack coat at a rate of 0.10 gal/yd² (0.45 L/m²) over non-milled surfaces and 0.20 gal/yd² (0.90 L/m²) over milled surfaces. Heat the bituminous tack coat and apply within a temperature range of 350 °F to 375 °F (175 ºC to 190 ºC). Use bituminous tack coat to bond non-self-adhesive fabric to the pavement and apply at a rate of 0.10 gal/yd² (0.45 L/m²) over non-milled surfaces and 0.25 gal/yd² (1.13 L/m²) over milled surfaces. Heat the bituminous tack coat and apply within a temperature range of 350 °F to 375 °F (175 ºC to 190 ºC). Where using fabric strips, use a template or other method satisfactory to the Engineer to apply bituminous tack coat uniformly. Do not allow the width of the bituminous tack coat applied to exceed the width of the fabric by more than 1 in. (25 mm) on each side. B. Placing the Fabric For self-adhesive reinforcement fabric, remove the release liner of the fabric and place the adhesive side to the pavement. Place self-adhesive reinforcement fabric no more than 24 hours in advance of the paving operation to ensure proper adhesion of the fabric to the pavement. Place non-self-adhesive reinforcement fabric at least 1 hour but no more than 24 hours in advance of the paving operation to ensure proper adhesion of the fabric to the pavement. Place fabric on the pavement immediately after the bituminous tack coat has been applied to the pavement. Place the non-woven polyester side of the fabric on the pavement. Install the fabric so that it is smooth, free of wrinkles with no uplifted edges. Provide a minimum of 5 in. (125 mm) overlap on all sides of the repair area. Center the material over the repair area within a 2 in. (50 mm) tolerance. When placed full width, use a mechanical device approved by the engineer to place the fabric on the pavement. Immediately after the fabric is placed on the pavement, ensure that the fabric is in total contact with the underlying pavement. Roll the material with a static drum or pneumatic roller to ensure adequate adhesion to the pavement surface. Any fabric with loose edges, corners or other improperly bonded areas shall be replaced at the expense of the Contractor prior to placement of the overlay or opening the fabric section to traffic. C. Overlapping Fabric If more than one strip of fabric is required to cover the repair area, the seams that are created shall be butt or lapped seams. When waterproofing is required, use lap seams with a minimum 2 in. (50 mm) overlap. Make all lapped seams in the direction of the paving operation to prevent pickup by the paving train. The width of the fabric strips shall be shown on the plans. Make joint overlaps to prevent pickup by the paving train that places the asphaltic concrete. D. Protecting Fabric When full width fabric is used, schedule work so that the fabric will be covered with asphaltic concrete prior to reopening the section to traffic. Do not allow traffic, other than necessary construction equipment or emergency vehicles, on unprotected fabric. If approved by the Engineer, traffic will be allowed to use a section with applied fabric strips for a maximum of 7 days. Coordinate all activities to conform to this restriction. Replace any damaged fabric prior to paving at the Contractor’s expense. When short-term pavement markings are required, the markings shall meet the requirements of Section 150. When in-place fabric is exposed to moisture prior to application of the overlay, make sure the fabric is completely dry before the overlay is placed. If the fabric sticks to tires of trucks or paving equipment during the construction overlays, hot mix asphalt may be broadcast over the fabric for protection. E. Placing Overlay Use an asphaltic concrete overlay that meets the requirements of Section 400. Prior to placement of the overlay, apply a bituminous tack coat over the fabric at a rate determined by the Engineer as described in Subsection 400.3.03.A.3. The minimum thickness of asphaltic concrete over the strip shall be 2 in. (50 mm). Milling may be required to provide the minimum thickness. When using a vibratory roller for compaction, avoid the use of excessive amplitude. The use of excessive amplitude during the compaction process may result in an undesirable riding surface.
446.3.06 Quality Acceptance
General Provisions 101 through 150.
446.3.07 Contractor Warranty and Maintenance
General Provisions 101 through 150.
446.4 Measurement
The reinforcement fabric complete, in place, and accepted is measured by the square yard (meter) for full-width fabric, or by the linear foot (meter) for fabric strips. No allowance will be made for laps.
446.4.01 Limits
General Provisions 101 through 150.
446.5 Payment
Payment will be made at the Contract Unit Price per square yard (meter) or per linear foot (meter) of reinforcement fabric as shown in Subsection 446.4, Measurement. Payment is full compensation for the work specified in this section, including cleaning the surface and furnishing and placing the pavement reinforcement fabric. Payment for Pavement Reinforcing Fabric Strips also includes all milling required to place the fabric according to the plans. Payment will be made under: Item No. 446 Pavement Reinforcement Fabric Strips, Type II, 18 in. (450 mm) Width Per linear foot (meter) Item No. 446 Pavement Reinforcement Fabric Full Width, Type II Per square yard (meter) Item No. 446 High Strength Pavement Reinforcement Fabric, 18 in. (450 mm) Width Per linear foot (meter)
446.5.01 Adjustments
General Provisions 101 through 150.
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