EFFECT OF SPECIMEN SIZE ON MARSHALL TEST RESULTS OF COLD-MIXED, ASPHALT-STABILIZED BASES

Because base-course aggregate gradations frequently have aggregate top sizes greater than 1 in., the use of the standard Marshall procedure in characterizing black-base mixtures has been questioned. A laboratory investigation was performed to evaluate the effect of increasing specimen size on the Marshall test results of emulsified-asphalt mixtures with an aggregate top size of 1.5 in. Two specimen sizes--4- and 6-in. diameters--were fabricated and tested with Marshall equipment at 72 deg F. The effects of other factors such as aggregate type, aggregate gradation, and emulsion content were investigated. The modified Marshall stability and flow values increased because of increasing specimen size. Large specimens displayed a slow rate of curing that resulted in larger values of bulk specific gravity, retained moisture, and total liquid and a smaller percentage of air voids than the standard-sized specimens. The cold-mixed, asphalt-stabilized bases can be adequately characterized in the standard Marshall size specimens if the Marshall test results are correlated with field performance. (Author)

Media Info

  • Media Type: Print
  • Features: Figures; References;
  • Pagination: pp 67-69
  • Monograph Title: Asphalt materials, mixtures, construction, moisture effects and sulfur
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00390793
  • Record Type: Publication
  • ISBN: 0309035546
  • Files: TRIS, TRB
  • Created Date: Dec 30 1984 12:00AM