Section 407 Section 407
407.03 Construction Requirements .
407.03.1 Equipment . The Contractor shall provide equipment for heating and applying
bituminous material. Heating equipment and distributors shall meet the requirements of Subsection 410.03.3. Other equipment for applying tack coat shall be approved by the Engineer prior to use.
407.03.2 Preparation of Surface . The existing surface shall be prepared in accordance
with Subsections 401.03.6 and 410.03.4.
407.03.3 Application of Bituminous Material . Tack coat shall be applied with a
distributor spray bar. A hand wand will only be allowed for applying tack coat on ramp pads, irregular shoulder areas, median crossovers, turnouts, or other irregular areas. Bituminous materials and application rates for tack coat shall be 0.05 to 0.10 gallons per square yard. Tack coat shall not be applied during wet or cold weather, or to a wet surface. Emulsions shall be allowed to "b reak" prior to superimposed construction.
407.04 Method of Measurement . Unless shown as a separate pay item in the proposal,
tack coat will not be measured for direct pa yment, but shall be considered a necessary part of the construction involved, and the cost thereof shall be includ ed in the appropriate contract unit prices. When shown as a separate pay item, bituminous tack coat material will be measured by the gallon as prescribed in Subsections 109.01 and 410.04. Emulsified asphalt as delivered by the producer will be measured prior to any dilution that may be required by the Engineer.
407.05 Basis of Payment. When shown as a separate pay item in the contract, tack coat will be paid for at the contract unit price per gallon, which price shall be full
compensation for co mpleting the work. Payment will be made under: 407-A: Asphalt for Tack Coat * - per gallon * Grade may be specified SECTION 408 - PRIME COAT
408.01 Description . This work consists of preparing and treating an existing surface
with bituminous material, and blotter materi al if required, in accordance with these specifications and in reasonably close confor mity with the lines shown on the plans or established by the Engineer.
408.02 Materials .
408.02.1 Bituminous Materials . The bituminous material shall conform to the
applicable requirements of Section 702. The type and grade of bituminous material will be specified in the contract. The grade may be changed one step by the Engineer at no change in unit price.
408.02.2 Blotter Material . Blotter material shall be sand clay or other friable or near
friable material approv ed by the Engineer.
408.03 Construction Requirements .
408.03.1 Seasonal and Weather Limitations . Bituminous material shall be applied
only when permitted under the seasonal and weather limitations specified in Subsection
410.03 2.
408.03.2 Equipment . The Contractor shall provide equipment for heating and applying
bituminous material. Heating equipment and distributors shall meet the requirements of Subsection 410.03.3.
408.03.3 Preparation of Surface . The surface to be primed shall be prepared in
accordance with Section 321 free from ruts, co rrugations, segregated material, or other irregularities. It shall be conditioned as set out in Subsection 410.03.4.
408.03.4 Application of Bituminous Material . The bituminous material shall be
applied in accordance with applicable requirements of Subsection 410.03.5. The bituminous material shall be applied at a rate of 0.15 to 0.50 gallons per square unless otherwise directed by the Engineer.
408.03.5 Application of Blotter Material . The Contractor shall furnish and spread, at
no additional cost to the State, the minimum necessary quantity of approved blotter material over the prime coat where necessa ry under the requirements of Subsection
104.04 408.03.6--Maintenance . The Contractor shall maintain the prime coat in a satisfactory
condition until covered by subsequent construction. Maintenance shall include immediate repairs of all damage that may occur. All maintenance shall be performed at the expense of the Contractor, and shall be repeated as often as necessary to properly maintain the work.
408.04 Method of Measurement . Asphalt for prime coat will be measured by the
gallon as prescribed in Subsections 109.01 a nd 410.04. Blotter material will not be paid for separately but shall be included in the unit price per gallon for prime coat.
408.05 Basis of Payment . Asphalt for prime coat, measured as prescribed above, will
be paid for at the contract unit price per gallon, which prices shall be full compensation for all incidentals necessary to complete the work. Payment will be made under: 408-A: Asphalt for Prime Coat, Grade - per gallon Section 409 Section 409 SECTION 409 - GEOTEXTILE FABRIC FOR UNDERSEAL
409.01 Description . This work consists of furnishing and placing fabric underseal in
accordance with the details shown on the plans and the requirements of these specifications. An underseal shall consist of an application of asphalt cement covered with a layer of fabric.
409.02 Materials .
409.02.1 Geotextile Fabric . The fabric shall meet the specific requirements for
geotextile fabric underseal contained in Subsection 714.13.4 and the applicable requirements of Subsection 714.13.
409.02.2 Bituminous Material . Unless otherwise designated, the asphalt sealant shall
be asphalt cement Grade PG 67 -22 meeting the applicable re quirements of Section 702.
409.03 Construction Requirements .
409.03.1 Equipment . The Contractor shall provide equipment for heating and applying
bituminous material and for laying the pavement fabric. Heating equipment and distributors shall meet the requirements of Subsection 410.03.3. The mechanical fabric laydown equipment shall be capable of handling full rolls of fabric and shall be capable of laying the fabric smoothly without excessive wrinkles and/or folds. When manual laydown is required, a length of standard one inch pipe and suitable roll tension devices shall be used for proper roll handling. The fabric manufacturer or distributor shall furnish a technician to supervise installation of the fabric and training of Contractor's personnel.
409.03.2 Surface Preparation . The surface to be treated, and at least one additional
foot on each side, shall be cleaned by sweeping, blowing, or other methods until all dust, dirt, mud, vegetation, and foreign materials are removed entirely from the pavement before the asphalt sealant is applied. Care shall be exercised to prevent material so removed from becoming mixed with subsequent courses.
409.03.3 Application of the Asphalt Sealant . The application of the asphalt sealant
shall conform to the applicable requirements of Section 410. The sealant shall be uniformly sprayed over the area to be covered by fabric at a rate recommended by the fabric manufacturer or distributor's technician and/or ordered by the Engineer. The rate of application is usually between 0.20 and 0.40 gallon per square yard. Varying surface conditions such as the degree of porosity of the existing pavement will cause varying application rates. The quantity applied shall be sufficient to bond and saturate the fabric, and to bond the subsequent overlay course to the fabric. Within intersections or other zones where vehicle braking is frequent, the application rate should be reduced. The sealant shall be applied to an area two to six inches wider than the width of fabric being placed, but restricted to the area of immediat e fabric laydown. Application shall be by distributor spray bar with hand hose spraying allowed only where the distributor spray bar cannot be used. Asphalt leakage from the distributor and any spillage shall be cleaned from the road surface to avoid flus hing and possible fabric movement at these