Asphalt binder grade selection and ignition oven calibration factors for HMAC with recycled asphalt products.

Details

• Creators:
  Scholz, Todd V. ; Samoo, Faisal
• Corporate Creators:
  Kiewit Center for Infrastructure and Transportation
• Subject/TRT Terms:
  Asphalt Emulsion Mixtures Asphalt Mixtures Binders Binders (Materials) Calibration Hot Mix Asphalt Ignition Nuclear Density Gages Pavements, Asphalt--Recycling Quality Assurance Quality Control Recycled Materials

  More +
• Publication/ Report Number:
  FHWA-OR-RD-13-05
• Resource Type:
  Tech Report
• Geographical Coverage:
  Oregon
• Edition:
  Final report.
• Corporate Publisher:
  Oregon. Dept. of Transportation. Research Section
• 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.
  
  
• Format:
  PDF
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:454b86578ea67ff231539e7b0e27f0613ca6df665608f34d646d2d91bd0be0de
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/25722/dot_25722_DS1.pdf
• File Type:
  [PDF - 11.68 MB ]