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6506-20 - Mix Design Hot Mix Asphalt Recycling(Materials...

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Hot Mix Asphalt Recycling (Materials and Mix Design) (This set of slides come from “Pavement Recycling Guidelines for State and Local Governments” by NCAT.) Mix Design Material Evaluation – Sampling – Reclaimed Asphalt Pavement (RAP) – Recycling Agents Mix Design Procedures – Conventional (Marshall/Hveem) – Superpave Sampling Sampling from Pavements for Preliminary Analysis Sampling from Trucks Sampling from Stockpiles Sampling from Pavements Divide Pavement into Sections of Equal Length Conduct Random Sampling Perform Tests If Pavement is One Lane Wide Divide Pavement into 12 to 16 Sections of Equal Length Obtain One Random Sample Per Section If Pavement is Two Lane Wide Divide Pavement into 6 to 8 Sections of Equal Length, 2 Lanes Wide Obtain One Random Sample Per Section, Per Lane Perform Tests Determine Mean, Standard Deviation Milling Machine Loading a Truck
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Sampling from Trucks Divide Production into one or two day periods Randomly Select Two Trucks Per Sampling Period Conduct Random Sampling Perform Tests Divide Production into 12 to 16 One Day Period Randomly Select Two Trucks per time Period for Sampling Obtain One Random Sample Per Truck Perform Tests Determine Mean, Standard Deviation RAP Stockpile Sampling from Stockpiles Divide Stockpile into Grid of Blocks Conduct Random Sampling from Each Block Obtain Samples from Top and Bottom Portion of Pile Perform Tests Divide Stockpile into a Grid of 12 to 16 Blocks Select One Random Sampling Point in Each Block With Power Equipment, Obtain One Sample from Upper Third and One from Lower Third of Pile at Each Sampling Point Without Power Equipment, Obtain One Sample from top
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