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334 - 1 . 5 . 1 Layer Thicknesses : Unless otherwise called for in the Contract <br /> Documents , the allowable layer thicknesses for HMA mixtures are as follows : <br /> Type SP-9 . 5 3/4 - 1 1 /2 inches <br /> Type SP - 12 . 5 1 1 /2 - 2 1 /2 inches <br /> 334 - 1 . 5 . 2 Additional Requirements : The following requirements also apply to <br /> HMA mixtures : <br /> 1 . When construction includes the paving of adjacent shoulders ( 55 feet <br /> wide ) , the layer thickness for the upper pavement layer and shoulder shall be the same and <br /> paved in a single pass , unless otherwise called for in the Contract Documents . <br /> 2 . For overbuild layers , use the minimum and maximum layer thicknesses <br /> as specified above unless called for differently in the Contract Documents . On variable <br /> thickness overbuild layers , the minimum allowable thickness may be reduced by 1 /2 inch , and <br /> the maximum allowable thickness may be increased by 1 /2 inch , unless called for differently <br /> in the Contract Documents . <br /> 334 - 1 . 6 Weight of Mixture : The weight of the mixture shall be determined as provided <br /> in 320 -2 . 2 of the Florida Department of Transportation ( FDOT ) specifications . <br /> 334-2 Materials . <br /> 334 -2 . 1 Superpave Asphalt Binder : Unless specified elsewhere in the Contract or in <br /> 334 -2 . 3 . 3 , use a PG 67 -22 asphalt binder from the Department' s Qualified Products List <br /> ( QPL ) . <br /> 334 -2 . 2 Aggregate : Use aggregate capable of producing a quality pavement . For <br /> Category 2 and 3 projects , require the aggregate supplier to certify that the material meets <br /> FDOT requirements . <br /> 334 -2 . 3 Reclaimed Asphalt Pavement ( RAP ) Material : <br /> 334 -2 . 3 . 1 General requirements : RAP may be used as a component of the <br /> asphalt mixture if approved by the Engineer . Usage of RAP is subject to the following <br /> requirements : <br /> 1 . Limit the amount of RAP material used in the mix to a maximum of 50 <br /> percent by weight of total aggregate . <br /> 2 . Do not use RAP material in any friction course mixes . <br /> 3 . Provide stockpiled RAP material that is reasonably consistent in <br /> characteristics and contains no aggregate particles which are soft or conglomerates of fines . <br /> 4 . Provide RAP material having a minimum average asphalt content of <br /> 4 . 0 percent by weight of total mix . The Engineer may sample the stockpile to verify that this <br /> requirement is met . <br /> 5 . Use a grizzly or grid over the RAP cold bin , in - line roller crusher , <br /> screen , or other suitable means to prevent oversized RAP material from showing up in the <br /> completed recycle mixture . If oversized RAP material appears in the completed recycle mix , <br /> take the appropriate corrective action immediately . If the appropriate corrective actions are <br /> not immediately taken , stop plant operations . <br /> 3344 . 3 . 2 Material Characterization : Assume responsibility for establishing the <br /> asphalt binder content , gradation , viscosity and bulk specific gravity ( Gsb ) of the RAP material <br /> based on a representative sampling of the material . <br /> 334 -2 . 3 . 3 Asphalt Binder for Mixes with RAP : Select the appropriate asphalt <br /> binder grade based on Table 334 - 2 . Maintain the viscosity of the recycled mixture within the <br /> range of 4 , 000 to 12 , 000 poises . <br /> 33 Technical Specifications <br /> F :\Public Works\ENGINEERING DIVISION PROJECTS\0744-8th St-US1 to 6th Ave\Admim\bid documents\0744 CONTRACT <br /> DOCUMENTS\Technical Specifications . doc <br />