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If If I If Iff , yi the RAP retained on the No . 4 sieve . The Engineer may sample the stockpile(s) to verify that this requirement is met. 334-2 .3 . 2 Material Characterization for Mix Design : Assume responsibility for establishing the asphalt binder content, gradation, viscosity and bulk specific gravity (Gsb) of the RAP material based on a representative sampling of the material by roadway cores or stockpile samples . For roadway core samples , assume responsibility for the degradation that will occur during the milling operation . 334-2 .3 .3 RAP Stockpile Approval : Prior to the incorporation of RAP into the asphalt mixture, stockpile the RAP material and obtain approval for the stockpile by one of the following methods : 1 . Continuous stockpile : When RAP is obtained from one or multiple sources and is either processed, blended, or fractionated, and stockpiled in a continuous manner, assure an adequate number of test results are obtained for stockpile approval . Test the RAP material for gradation and asphalt content at a minimum frequency of 1 sample per 1000 tons with a minimum of six test results , Test the RAP material for Gmm (for Gsb determination) and for recovered viscosity at a minimum frequency of 1 sample per 5000 tons with a minimum of two test results . Based on visual inspection and a review of the test data, the Engineer will determine the suitability of the stockpiled material . In addition , address in the QC Plan the details and specifics of the processing, sampling, testing and actions to be taken . 2 . Non-continuous single stockpile : When an individual stockpile is being constructed, obtain representative samples at random locations and test the RAP material for gradation and asphalt content at a minimum frequency of 1 sample per 1000 tons with a minimum of six test results . Test the RAP material for Gmm (for Gsb determination) and for recovered viscosity at a minimum frequency of 1 sample per 5000 tons with a minimum of two test results . Based on visual inspection and a review of the test data, the Engineer will determine the suitability of the stockpiled material . Once the RAP stockpile has been approved, do not add additional material without prior approval of the Engineer. Determine the asphalt binder content and gradation of the RAP material in accordance with FM 5 - 563 and FM 1 -T 030 , respectively. Extract and recover the asphalt binder from the RAP in accordance with FM 5 - 524 and FM 3 -1) 5404 , respectively. Determine the viscosity of the recovered asphalt binder in accordance with ASTM D 2171 . Establish the Gsb of the RAP material by using one of the following methods : a. Calculate the Gsb value based upon the effective specific gravity (GS,) of the RAP material , determined on the basis of the asphalt binder content and maximum specific gravity (Gmm) of the RAP material . The Engineer will approve the estimated asphalt binder absorption value used in the calculation . b . Measure the Gsb of the RAP aggregate , in accordance with FM 1 -T 084 and FM 1 -T 085 . Obtain the aggregate by using a solvent extraction method. 334-2 .3 .4 Pavement Composition : When the Contract includes milling of the existing asphalt pavement, the Pavement Composition Data Sheet may be available on the Department ' s website . The URL for obtaining this information, if available , is : www . dot. state . fl , us/statematen* alsoffice/laboratory/asphalt/centrallaboratory/compositions/index . shtm . 334-2 .3 . 5 Asphalt Binder for Mixes with RAP : Select the appropriate asphalt binder grade based on Table 334-2 . The Engineer reserves the right to change the asphalt binder type and grade at design based on the characteristics of the RAP asphalt binder, and reserves the - 84 - FPID ( S ) : 423186 - 1 - 58 - 01