Evaluation of the Supplemental Procedure of the Maximum Specific Gravity Test for Bituminous Paving Mixtures
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Evaluation of the Supplemental Procedure of the Maximum Specific Gravity Test for Bituminous Paving Mixtures

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English
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  • Creators:
    Stuart, K. D.
  • Corporate Creators:
    United States. Federal Highway Administration. Office of Engineering and Highway Operations R&D
  • Subject/TRT Terms:
  • Publication/ Report Number:
    FHWA-RD-90-082
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    United States
  • Corporate Publisher:
    United States. Department of Transportation. Federal Highway Administration
  • Abstract:
    The objective of this study was to investigate the effects of performing the supplemental procedure of AASHTO T 209 (or ASTM D 2041) on the percent air voids, the effective aggregate specific gravity, and the maximum specific gravity of a bituminous paving mixture, using both thoroughly coated aggregates and partially coated aggregates. The supplemental procedure should correct the test data for water absorbed into the aggregate during the test. Although the supplemental procedure can be used when designing mixtures, it is most often used for determining the maximum specific gravities of moisture damaged pavement samples, or cores or specimens where sawing has exposed a significant amount of aggregate. The majority of aggregates used in this study had water absorptions below 2.5% and thus were not highly absorptive. It is recommended that the supplemental procedure not be peformed on laboratory mixtures or pavement cores having aggregates with water absorptions below 2.5%. When testing any mixture prepared in the laboratory during the mixture design process, the procedure for determining the maximum specific gravity should only be performed on well coated mixtures so that the supplemental procedure does not have to be used. For highly absorptive aggregates, it is recommended that the test only be performed at high binder contents which provide thick coatings. Only binder contents close to or slightly above the optimal binder content should be used. The maximum specific gravities for the lower binder contents can be calculated using the effective specific gravity of the aggregate. For laboratory mixtures containing highly absorptive aggregates, the supplemental procedure may indicate whether the coating is sufficient.
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