REALISTIC JOB-MIX FORMULA TOLERANCES FOR ASPHALT CONCRETE

IN 1961, THE DEPARTMENT INITIATED A STUDY TO DETERMINE THE UNIFORMITY OF ASPHALT-CONCRETE TOP COURSE MIX, AND THE RESULTING INFORMATION WAS USED TO ESTABLISH REALISTIC GRADATION CONTROL SPECIFICATIONS. DURING THE YEARS BETWEEN 1961 AND 1964 RESEARCH CREWS VISITED 55 ASPHALT PLANTS WHERE THEY OBTAINED 868 HOT-BIN SAMPLES AND 682 MIX SAMPLES. DATA WERE PROCESSED AND ANALYZED BY ELECTRONIC COMPUTER AND FROM THE RESULTS IT IS CONCLUDED THAT THE MIX GRADATION DEPENDS ON THE METHOD OF TESTING (I.E., HOT-BIN ANALYSIS OR EXTRACTION TEST). NEITHER METHOD IS TOTALLY SUPERIOR TO THE OTHER, BUT THEY COMPLEMENT EACH OTHER. THE HOT-BIN METHOD IS MORE MEANINGFUL WHEN RELATED TO COARSE AGGREGATE THAN WHEN RELATED TO FINE AGGREGATE, WHILE THE REVERSE IS TRUE WITH THE EXTRACTION TEST. JOB-MIX FORMULA TOLERANCES DEVELOPED FROM THIS STUDY ARE REALISTIC AND FAIR TO BOTH THE PRODUCER AND THE DEPARTMENT, AND ARE NOW BEING USED ON A STATEWIDE BASIS. /AUTHOR/

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/hrr/1967/184/184-004.pdf
• Supplemental Notes:
  • Paper sponsored by Committee on Construction Practices--Flexible Pavement and presented at the 46th Annual Meeting. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
• Authors:
  • Graham, Malcolm D
  • Burnett, William C
  • Thomas, Jerome J
• Publication Date: 1967

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 55-66
• Monograph Title: Quality Control
• Serial:
  • Highway Research Record
  • Issue Number: 184
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Aggregate gradation; Asphalt concrete; Chemical analysis; Computers; Control; Data collection; Resource extraction; Specifications; Standardization; Test procedures; Wearing course (Pavements)
• Uncontrolled Terms: Extraction (Chemistry)
• Old TRIS Terms: Gradation; Gradation analysis; Hot bin; Job mix formula
• Subject Areas: Construction; Highways; Materials;

Filing Info

• Accession Number: 00210618
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Oct 13 1994 12:00AM