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<br />n <br /> <br />. <br /> <br />.., <br /> <br />,., <br />. <br /> <br />337-8 Thickness of Friction Courses. <br />337-8.1 FC-12.5 and FC-9.5: The thickness of the friction course layer will be the <br />plan thickness as shown in the Contract Documents. For construction purposes, the plan <br />thickness will be converted to spread rate as defined in 334-1 .4. <br />Plan quantities are based on a Gmm of 2.540, corresponding to a spread rate <br />of 110 Ibs/yd2-in [23.6 kg/m211 0 mm]. Pay quantities will be based on the actual maximum <br />specific gravity of the mix being used. <br />337-8.2 FC-5: The total thickness of the FC-5 layer will be the plan thickness as <br />shown in the Contract Documents. For construction purposes, the plan thickness will be <br />converted to spread rate based on the combined aggregate bulk specific gravity of the <br />asphalt mix being used as shown in the following equation: <br />Non-SI Units <br /> <br />. <br /> <br />., <br />. <br /> <br />,., <br />. <br /> <br />..., <br />. <br /> <br />Spread rate (lbs/yd2) = t X Gsb x 40.5 <br /> <br />" <br />. <br /> <br />Gsb <br /> <br />t = Thickness (in.) (Plan thickness) <br />Combined aggregate bulk specific gravity from the verified <br /> <br />Where: <br /> <br />.., <br />. <br /> <br />mix design <br />SI Units <br /> <br />.., <br /> <br />Spread rate (kg/m2) = t x Gsb x 0.83 <br /> <br />. <br /> <br />.., <br />. <br /> <br />Gsb <br /> <br />t = Thickness (mm) (Plan thickness) <br />= Combined aggregate bulk specific gravity from the verified <br /> <br />Where: <br /> <br />mix design <br /> <br />.., <br />. <br /> <br />The weight of the mixture shall be determined as provided in 320-2.2. <br />Plan quantities are based on a Gsb of 2.635, corresponding to a spread rate <br />of 80 Ibs/yd2 [44 kg/m2]. Pay quantities will be based on the actual combined aggregate <br />bulk specific gravity (Gsb) of the mix being used. <br /> <br />'"l <br />. <br /> <br />~ <br /> <br />337-9 Special Equipment Requirements for FC-5. <br />337-9.1 Fiber Supply System: Use a separate feed system to accurately proportion <br />the required quantity of mineral fibers into the mixture in such a manner that uniform <br />distribution is obtained. Interlock the proportioning device with the aggregate feed or weigh <br />system to maintain the correct proportions for all rates of production and batch sizes. <br />Control the proportion of fibers to within plus or minus 10% of the amount of fibers <br />required. Provide flow indicators or sensing devices for the fiber system, interlocked with <br />plant controls so that the mixture production will be interrupted if introduction of the fiber <br />fails. <br />When a batch plant is used, add the fiber to the aggregate in the weigh <br />hopper or as approved and directed by the Engineer. Increase the batch dry mixing time by <br />8 to 12 seconds, or as directed by the Engineer, from the time the aggregate is completely <br />emptied into the pugmill. Ensure that the fibers are uniformly distributed prior to the <br />addition of asphalt rubber into the pugmill. <br />When a drum-mix plant is used, add and uniformly disperse the fiber with the <br />aggregate prior to the addition of the asphalt rubber. Add the fiber in such a manner that it <br />will not become entrained in the exhaust system of the drier or plant. <br />337-9.2 Hydrated lime Supply System: For FC-5 mixes containing granite, use a <br /> <br />.., <br />. <br /> <br />.., <br />. <br /> <br />.., <br /> <br />. <br /> <br />.., <br /> <br />. <br /> <br />.., <br /> <br />. <br /> <br />. <br /> <br />,...... <br /> <br />09/09 <br /> <br />01000-77 <br /> <br />03-4122.F <br /> <br />... <br />