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Aggregate Properties and the Performance of Superpave-Designed Hot-Mix Asphalt (2005) / Chapter Skim
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Pages 60-66

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From page 60...
... 3.2.2 Fine Aggregate Angularity Superpave specifies the uncompacted voids in fine aggregate test (AASHTO T304 or ASTM C1252, Method A) to ensure that the blend of fine aggregates in an HMA mixture has sufficient angularity, texture, or both to provide resistance to rutting.
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From page 61...
... ESALs All other mixes must be coarse graded unless FAA > 44 Missouri Eliminated reduced requirements for > 100 mm from surface in AASHTO M323 Nebraska 40 for low traffic, 43 for medium traffic, 45 for Interstate pavements New Mexico Eliminated reduced requirements for > 100 mm from surface I M323 Ohio 44 for single source or blend, all traffic levels Ontario Allow 43 if mixture volumetric properties are satisfied. Utah 45 for all traffic levels Virginia 45 for all traffic levels, 40 for 9.5 mm NMAS Subdivision mix Washington 45 for all traffic levels Wisconsin 40 < 1 M
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From page 62...
... Prior to the adoption of the Superpave method, FHWA recommended limiting natural sand to less than 15%. 3.2.3 Coarse Aggregate Angularity The coarse aggregate angularity test is used to measure the number of fractured faces on a coarse aggregate particle according to ASTM D5821 or AASHTO TP61-02.
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From page 63...
... Of the state agencies that specify ASTM D4791 or a similar agency test method, 63% specify criteria that match those outlined in AASHTO M323. Kentucky specifies less than 10% of 51 particles for all traffic levels.
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From page 64...
... The aggregate abrasion value test was developed by Ontario and produces results similar to the LA abrasion test, with more portable equipment (115)
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From page 65...
... . The distribution of soundness specifications for coarse aggregate is shown in Figure 28.
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From page 66...
... The majority of the responding agencies specify the Superpave consensus aggregate properties and source property test methods; however, lower percentages follow the specification values for the consensus properties. Agencies provided little indication as to the reasoning behind their changes.
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Key Terms

  • uncompacted voids
  • fine aggregates
  • natural sand
  • fine aggregate
  • value test

  • test method
  • aggregate properties
  • coarse aggregate
  • sulfate soundness
  • abrasion test

  • natural sands
  • pacted voids
  • traffic levels
  • elongated particles
  • abrasion value

  • aggregate angularity
  • particle size
  • uncompacted void
  • asphalt content
  • soundness test

  • minimum vma
  • aggregate abrasion
  • locally available
  • minimum uncompacted
  • limestone aggregates


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