2011-226B.1 - Laserfiche WebLink

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Stockpiles : Assure materials are placed in the correct stockpile ; assure good stockpiling techniques ; inspect stockpiles for separation, contamination, segregation , etc . ; properly identify and label each stockpile . Incoming Aggregate : Obtain gradations and bulk specific gravity (GO values from aggregate supplier for reference ; determine the gradation of all component materials ; routinely compare gradations and Gsb values to mix design . Cold Bins : Calibrate the cold gate/feeder belt for each material ; determine cold gate/feeder belt settings ; observe operation of cold feeder for uniformity. Dryer: Observe pyrometer for aggregate temperature control ; observe efficiency of the burner. For Batch Plants , determine percent used and weight to be pulled from each bin to assure compliance with Mix Design, check mixing time , and check operations of weigh bucket and scales . For Drum Mixer Plants , determine aggregate moisture content, and calibrate the weigh bridge on the charging conveyor. Control Charts : Plot and keep charts updated daily for all Quality Control Sampling and Testing and post in the asphalt lab where they can be seen . Provide the following charts : 1 . All components used to determine the composite pay factor (No . 8 sieve , No . 200 sieve , asphalt binder content, air voids , and density) by lot. 2 . Gradation of incoming aggregate . 3 . Gradation, asphalt binder content, and maximum specific gravity (Gm, ,) of RAP . 4 . Any other test result or material characteristic (as determined by the Contractor) necessary for process control . The above listed minimum activities are to be considered normal activities necessary to control the production of hot mix asphalt at an acceptable quality level . It is recognized, however, that depending on the type of process or materials , some of the activities listed may not be necessary and in other cases , additional activities may be required . The frequency of these activities will also vary with the process and the materials . When the process varies from the defined process average and variability targets , the frequency of these activities will be increased until the proper conditions have been restored . 330-2 .2 Minimum Process Control Testing Requirements : Perform, as a minimum, the following activities at the testing frequencies provided below : Asphalt Plant 1 . Asphalt Mix : Determine the asphalt binder content ; mix gradation and volumetric properties at a minimum frequency of one per day. In the event that the daily production exceeds 1 , 000 tons , perform these tests a minimum of two times per day. Quality Control tests used in the acceptance decision may be used to fulfill this requirement . Verify modifier addition . 2 . Aggregate : Test one sample for gradation per 1 , 000 tons of incoming aggregate , as it is stockpiled. 3 . Aggregate moisture content from stockpiles or combined cold feed aggregate - one per day. 4 . RAP : Test one sample per 1000 tons of incoming material (prior to incorporation into the mix) for gradation and asphalt binder content . Test one sample per 5 , 000 - 67 - FPID ( S ) : 423186 - 1 - 58 -01