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SECTION 39 <br /> 39-1 ASPHALT CONCRETE . --Asphalt Concrete shall conform to <br /> the requirements in Section 39, "Asphalt Concrete" , of the <br /> Standard Specifications and these special provisions. <br /> Asphalt concre�-c.- shall be Type "B" . Aggregate, shall conform <br /> to the 1/2-inch maximum, coarse or medium grading as determined <br /> by the Engineer. At the contractors option, and with approval <br /> of the Engineer, aggregate may be 3/4-inch maximum, medium grading <br /> with the exception of the final finish course. <br /> Aggregate conforming to the 3/9-inch maximum grading will be <br /> permitted for use in driveways , dikes and other areas with <br /> approval of the Engineer. <br /> The amount of asphalt binder to be mixed with the aggregate <br /> shall be between 5 percent and 7 percent by weight of the dry <br /> aggregate. The exact amount of asphalt binder to be mixed with <br /> the aggregate and the AR viscosity grade of the asphalt binder <br /> will be determined by the Engineer. <br /> Paint binder shall be applied at a rate of approximately <br /> 0 .05 gallon per square yard, unless otherwise shown on the plans. <br /> When the asphalt concrete is to be produced in a batch plant, <br /> the asphalt concrete shall be proportioned and mixed by the <br /> automatic method. <br /> All steel-tired rollers shall be of the tandem type: <br /> When shown in the Engineer's Estimate prime coat liquid <br /> asphalt penetration grade shall be SC 70 or SC 250 as directed by <br /> the Engineer. <br /> The dumping of material in a windrow, in accordance with <br /> Section 39-5 .01, shall be limited to 750 feet in advance of the <br /> paving machine , unless otherwise permitted by the Engineer. <br /> Unless otherwise shown on the plans, asphalt paver equipment used <br /> to place asphalt concrete shall be equipped with full automatic <br /> screed and grade sensing controls which shall control the longitudinal <br /> grade and transverse slope of the screed. The controls shall be <br /> actuated by grade and slope references. Corrections on account <br /> of deviations from the references shall be automatic. Guides and <br /> references required to control the longitudinal grade and transverse <br /> slopes shall be furnished and installed by the Contractor. <br /> Should the contractor elect to use a ski device sensing from <br /> subgrade for longitudinal control , the minimum length of the device <br /> shall be 30 feet. The device shall be a rigid unit mounted on multiple <br /> supports. Each support shall act independently of others and the <br /> finished grade shall not be affected by the action of a single support. <br /> III 39-1 <br />