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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.
