409.03 Fabric Reinforcement for Asphalt Pavement
408.06 Basis of Payment
The Department will pay for each pay item at the contract unit price per the specified pay unit as follows: Pay Item: Pay Unit: PRIME COAT Gallon [Liter] Include the cost of blotter material in the contract unit price for Prime Coat .
409.01 Description
This work consists of applying reinforcement fabric for asphalt pavement.
409.02 Materials
Provide materials in accordance with the following subsections: Material: Subsection: Reinforcement Fabric 712.0 1 Asphalt Cement 708.03
409.03 Equipment
A.Distributors Provide distributors in accordance with Subsection 401.03, “Equipment.” Ensure the distributors have hand sprayers.
B.Fabric Laydown Equipment Provide mechanical fabric laydown equipment capable of handling and placing full or partial rolls of fabric smoothly.
C.Miscellaneous Equipment Provide miscellaneous equipment, incl uding: Stiff bristle brooms, to smooth the fabric; Scissors or blades, to cut the fabric; and Brushes, to apply bituminous binder to fabric overlap at spliced joints.
D.Pneumatic -Tired Rollers Provide pneumatic -tired rollers in accordance with Subsection 401.03, “Equipment.” FABRIC REINFORCEMENT FOR ASPHALT PAVEMENT 409.04
409.04 Construction Methods
A.Surface Preparation Remove foreign material, such as dirt, dust, water, or oil, from the prepared surface.
B.Application of Bituminous Binder Heat the bituminous binder material. Use an asphalt distributor to spray uniformly the area to be covered with fabric. Hand -spray areas inaccessible to the distributor. Use paper or roofing felt to provide neat cutoff lines at locations where the distributor application of bituminous binder starts or stops. Keep the bituminous binder at a temperature of at least 290 °F [143 °C] during application. If fabric is over -sprayed, ensure that the application temperature does not exceed 325 °F [163 °C] to avoid damaging the fabr ic. Estimate the quantity of bituminous binder using an approximate rate of 0.200 gal/yd² to 0.250 gal/yd² [0.905 L/m² to 1.130 L/m²]. Apply the bituminous binder in accordance with the minimum recommended rate as specified by the fabric manufacturer and as directed by the Resident Engineer. Apply the binder from 2 in to 6 in [50 mm to 150 mm] wider than the fabric. During binder application, avoid spills or excessive application causing flushing of the bituminous material.
C.Placement of Reinforcement Fabric Mechanically place the fabric before the bituminous binder cools and loses tackiness. The Department will not allow manual placement. Unroll and place the fabric on the binder with the unfused, fuzzy side down. Lay the fabric as smoothly as poss ible. Broom the fabric to remove air bubbles, and to maximize contact with the pavement. Cut wrinkles and lay fabric flat. If the fabric becomes misaligned, cut, realign, and joint the fabric as directed by the Resident Engineer. Overlap fabric at joint s from 4 in to 6 in [100 mm to 150 mm]. To prevent the paver from disturbing the fabric, overlap transverse joints in the direction of paving (ending edge of the old fabric roll over leading edge of new fabric roll). Apply additional binder to joints as directed by the Resident Engineer. Mop, brush, or hand -spray transverse joints. Spray longitudinal joints with the distributor. Use self -propelled pneumatic -tired rollers to embed reinforcement fabric into the bituminous binder and bond it to the pavemen t. Blot the fabric with clean, dry sand before placing traffic directly on the fabric. If excess binder bleeds through the fabric before placing pavement overlay, blot the excess binder by spreading sand on the affected area as directed by the Resident En gineer.
D.Weather Limitations For fabric installation, apply bituminous binder when the ambient air temperature is at least 50 °F [10 °C], unless otherwise approved by the Resident Engineer. Do not place bituminous binder application if it is raining or rain is imminent.
410.01 Micro Surfacing
E.Tack Coat Apply a tack coat in accordance with Section 407, “Fog Seal and Tack Coat” if required by the Contract . The Resident Engineer will approve the bituminous material type, grade, rate of application, and temperature. Do not use cutback asphalt or emulsified asphalt that contain petroleum distillate.
F.Pavement Overlay Place the pavement overlay immediately after placing the fabric, unless directed otherwise by the Resident Engineer. Ensure the pavement overlay temperature does not exceed 325 °F [163 °C] to prevent damage to the fabric. To avoid damaging the fabric, minimize turning movements. If necessary, turn pavers and vehicles gradually and broadcast clean, dry sand ahead of trucks and pav ers to prevent fabric damage. Remove excess sand ahead of paving operations. Repair damage to or debonding of the fabric reinforcement caused by traffic, wet weather conditions, improper installation, or equipment, at no additional cost to the Department.
409.05 Method of Measuremen T
The Resident Engineer will measure the area covered by Fabric Reinforcement after placement, not including overlaps.
409.06 Basis of Payment
The Department will pay for each pay item at the contract unit price per the specifie d pay unit as follows: Pay Item: Pay Unit:
A.FABRIC REINFORCEMENT Square Yard [Square Meter]
B.BITUMINOUS BINDER Gallon [Liter] Include the cost of the tack coat and sand used for blotting in the contract unit price for Fabric Reinforcement . SECTION 410 MICRO SURFACING
410.01 Description
This section covers the materials, equipment, construction and application procedures for placing Micro Surfacing material , filling ruts , and surfacing existing paved surfaces. The Micro Surfacing shall be a mixture of a polymer -modified asphalt emulsion, 100 percent crushed mineral aggregate, mineral filler, water and other additives for control of set time in the field. All ingredients shall be properly proportioned, mixed and spread on the paved surface in accord ance with this Specification and as directed by the Engineer.
Source: Oklahoma Standard Specifications for Highway Construction, 2019 Edition. Pages 244–245 of 935.