411Paving Fabric

Paving Fabric

411.1DESCRIPTION

This section describes the requirements for providing and placing performance graded asphalt binder and paving fabric. This applies to fabric membranes used for full coverage of the pavement or as strips over transverse and longitudinal pavement joints.

411.2MATERIALS

1 Provide materials in accordance with the following:

Material Subsection Glass Fiber Reinforced Paving Fabric 805.3 Paving Fabric 805.3 Performance Graded Asphalt Binder 804.1

2 Use an authorized source of PGAB, in accordance with Subsection 804.1, Performance Graded Asphalt Binder and Subsection 401.2.1, Performance Graded Asphalt Binder.

411.3EQUIPMENT

1 Ensure that equipment meets the following:

Equipment Subsection Asphalt Distributor 407.3 Tank Trucks 401.3.4.1 Storage Tanks 401.3.8

2 Provide an asphalt distributor that has a single-nozzle hand spray with a positive shut-off valve.

3 Provide mechanical or manual lay-down equipment to lay the fabric smoothly and a pneumatic roller if required.

4 Provide stiff bristle brooms or squeegees to smooth the fabric, scissors or blades to cut the fabric, and brushes to apply PGAB at fabric overlaps.

411.4CONSTRUCTION

411.4.1 General

1 Store fabric rolls so that they are protected from the weather. If stored outdoors, store the rolls elevated above the ground and protected with a waterproof covering.

Paving Fabric SECTION 411

Install fabric when pavement and air temperatures are 50 °F [10 °C] and rising and the surface is dry.

2 Do not use more than one paving fabric product.

3 Do not expose fabric to traffic except for emergency and construction traffic. Leave no more than 10 ft [3 m] of the paving fabric installation exposed to traffic at the end of the day’s work. At no additional cost to the department, provide specified temporary traffic control, including flagging, to route traffic through the construction area where fabric is in place and not covered with a lift of plant mix pavement.

411.4.2 Application of PGAB

1 Before applying the PGAB and fabric, clean the roadway surface of extraneous material, including vegetation, dirt, mud, and loose material.

2 Apply the PGAB to the prepared surface so that there is uniform, complete coverage, at the rate and width specified. Use a distributor spray bar and keep hand spraying to a minimum. For PGAB, the minimum application temperature is 290 °F [140 °C] and the maximum temperature in the distributor is 325 °F [160 °C].

3 Apply in widths equal to that of the fabric width plus 6 in [150 mm]. Do not apply PGAB any farther in advance of fabric placement than the distance that can be maintained free of traffic. Clean PGAB spills from the road surface.

411.4.3 Fabric Placement

1 Ensure the presence of a representative of the fabric manufacturer during initial placement of the fabric.

2 Before the PGAB cools and loses tackiness, place the fabric into the PGAB with minimum wrinkling. Cut and lay flat wrinkles or folds greater than 1 in [25 mm]. Use brooming to maximize fabric contact with the pavement surface. Use a pneumatic roller when the air temperature is lower than 60 °F [15 °C] or the wind speed is greater than 20 mph [30 km/h].

3 Sufficiently overlap fabric joints to ensure full closure but not more than 6 in [150 mm]. Lap transverse joints in the direction of paving to prevent edge pickup by the paver. If necessary, apply PGAB to fabric overlaps a second time to ensure proper bonding of the double fabric layer.

4 Ensure that paving equipment and hauling units do not wrinkle, fold, or displace the fabric. Replace damaged fabric at no additional cost to the department.

5 Keep the plant mix overlay at a temperature in accordance with the fabric manufacturer’s recommendations. If the PGAB bleeds through the fabric and causes

Paving Fabric SECTION 411

construction problems before placement of the overlay , blot the areas by spreading washed sand or hot-mix.

411.4.3.1 Additional Requirements for Glass Fiber Reinforced Paving Fabric

1 Fill cracks greater than ¼ in [6 mm] in width or holes greater than ½ in [13 mm] in diameter in the existing pavement with bituminous filler material that contains no solvents. Obtain approval from the engineer regarding the bituminous filler material and the proposed composite material placement method before work begins.

2 Apply the asphalt binder at a rate of 0.23 to 0.28 gal/yd2 [1.0 to 1.3 L/m2], depending upon the roughness of the existing surface, before placing the composite material. Ensure the temperature of the asphalt binder during application is within the asphalt supplier’s recommended mixing temperature range for the performance grade being used. Follow the composite material manufacturer’s representative’s temperature recommendations if they are different from the asphalt supplier’s. Ensure the width of the asphalt binder application is 6 in [150 mm] greater than the width of the composite material to be placed. Coordinate the application of the asphalt binder and the placement of the composite material to ensure complete bonding of the composite material to the substrate surface.

3 Ensure the composite material exceeds the size of the cracked area by at least 6 in [150 mm] in all directions. Place the composite material with the grid side up. Place the composite material using continuous pieces wherever possible. Ensure individual pieces overlap 2 in to 6 in [50 mm to 150 mm]. Ensure end joints and joints from the repair of wrinkles overlap or shingle in the direction that the pavement overlay will be placed. Apply a uniform layer of asphalt binder between overlaps. Perform brooming, rubber tire rolling, or both to maximize composite material contact with the substrate surface.

4 Correct any excess asphalt binder that bleeds through the composite material by broadcasting blotter material meeting the requirements of Subsection 803.9, Aggregate for Blotter, or place hot mix over the bleed spots, as approved by the engineer . If it rains on the composite material before the new plant mix pavement is placed, allow the composite material to dry completely before placing the pavement.

411.4.4 Acceptance

1 The engineer will accept PGAB in accordance with Subsection 804.1, Performance Graded Asphalt Binder, and Subsection 113.2, Acceptance of Asphalt Materials.

411.5MEASUREMENT and PAYMENT

411.5.1 General

1 The engineer will measure Paving Fabric by the square yard [square meter] of surface area complete and in place with no allowance for overlaps.

Paving Fabric SECTION 411

2 The department will pay as follows:

Pay Item

Pay Unit Measure to the Nearest Pay to the Nearest Glass Fiber Reinforced Paving Fabric SY [m2] 0.1 ft [0.05 m] SY [m2] Paving Fabric SY [m2] 0.1 ft [0.05 m] SY [m2]

411.5.2 Referenced Sections for Direct Payment

1 When specified, the engineer will measure, pay, and price adjust for Asphalt Binder (PG__-__) in accordance with Section 401, Plant Mix Pavement. The measurement will not include quantities of PGAB applied in excess of the application rate.