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Asphalt binder grade selection and ignition oven calibration factors for HMAC with recycled asphalt products.
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2013-02-01
[PDF-11.68 MB]
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Edition:Final report.
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Abstract:This study investigated several characteristics of laboratory-fabricated and plant-produced hot-mix asphalt mixtures containing
various proportions of RAP and RAS with the principal objectives of developing a procedure for selecting the virgin binder grade
used in such mixtures as well as a procedure for determining ignition oven calibration factors for mixtures containing these
materials. Other objectives included developing recommendations for procedures to effectively and efficiently recover asphalt
binder from RAS, batch and mix reclaimed materials with virgin materials, and for quality control and quality assurance testing.
The blending chart analysis procedure described in AASHTO PP 53 for selecting a virgin binder grade was selected as a
starting point for evaluation purposes, but the attempt to validate the procedure was unsuccessful. Consequently, an alternate
approach was recommended for further investigation.
ODOT’s current method for determining ignition oven calibration factors (TM 323) was evaluated using both laboratoryprepared
and plant-produced mixtures. Findings from this evaluation provided strong evidence to suggest procedural changes to
the current method are unnecessary. Further, modification of ODOT’s current independent assurance parameter for asphalt binder
content is not justified at this time. However, changes to the language in the test method to include RAS are needed and
recommendations for these are provided.
Selection of procedures for extracting and recovering binder from RAS was accomplished through a literature search. Selection
of procedures for QC and QA was accomplished in the same manner. However, detailed procedures for fabricating laboratory
specimens containing RAS were not found. Consequently, taking into consideration existing procedures, new procedures were
developed for batching and mixing specimens containing RAP, RAS, or combinations of RAP and RAS.
The applicability of using of nuclear density gauges to determine in-place density of mixtures containing RAS was also
evaluated. Assessment was based on variability of density measurements obtained from nuclear gauges and from pavement cores.
Findings indicated no difference in the quality of measurements made on mixtures containing RAP and RAS versus those
containing only RAP.
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