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OCR for page 150
150 A Manual for Design of Hot Mix Asphalt with Commentary incorporating RAP may require the consideration of multiple RAP stockpiles each with a specific aggregate gradation and binder content. Overview of the Mixture Design Process with RAP Figure 9-1 is a flowchart for designing HMA mixtures with RAP. In the volumetric design and performance analysis, RAP stockpiles are treated much the same as new material stockpiles. RAP stockpiles, however, require additional testing to characterize the properties and the variability of the RAP material. SAMPLE RAP STOCKPILES 8 - 10 LOCATIONS SPLIT SAMPLE FOR BINDER COMBINE INDIVIDUAL CONTENT AND GRADATION SAMPLES TO OBTAIN ANALYSIS REPRESENTATIVE SAMPLE DETERMINE AVERAGE AND STANDARD DEVIATION OF BINDER CONTENT AND GRADATION SPLIT SAMPLE FOR DETERMINE FEASIBLE RAP CHARACTERIZING RAP CONTENTS BASED ON AGGREGATE AND BINDER GRADATION AND VARIABILITY PROPERTIES RAP AGGREGATE PROPERTIES DESIRED RAP BINDER RAP PROPERTIES Yes CONTENT >15 % ? BLENDING CHART No ANALYSIS VOLUMETRIC MIXTURE DESIGN PERFORMANCE TESTING AS REQUIRED Figure 9-1. Overview of HMA mixture design with RAP.