Evaluation of Superpave Gyratory Compaction of Hot Mix Asphalt
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Evaluation of Superpave Gyratory Compaction of Hot Mix Asphalt

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English
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    Report No: NCAT Report No. 98-5
  • Resource Type:
    Research Paper
  • Corporate Publisher:
    National Center for Asphalt Technology (U.S.)
  • Abstract:
    About 85 percent of hot mix asphalt (HMA) by volume consist of mineral aggregate. One of the most important properties of the aggregate in a HMA mix is the gradation. This study was carried out to evaluate the effect of restricted zone on volumetric properties of mixes consisting of all crushed and partially uncrushed materials. Mix designs were conducted with the Superpave gyratory compactor for two types of aggregate blends: one with all crushed granite and another with crushed granite and 20% natural sand. Three gradations for each type of aggregate blend consisted of gradations passing above, through, and below the restricted zone. For a given aggregate blend, gradations below or above the restricted zone provided higher voids in mineral aggregate (VMA) than mixes through the restricted zone. Mixes with crushed aggregate provided higher VMA than mixes with partially crushed aggregate. The mixes with gradations below the restricted zone had the highest voids at Superpave design parameter N-initial, whereas the mixes with gradations above the restricted zone had the lowest voids at N-initial. None of the mixes containing natural sand met all the requirements for volumetric and gyratory properties. The mixtures for all crushed material met all requirements when passing through the restricted zone and below the restricted zone. It is recommended that further work be conducted to evaluate the effect of different types and shapes of aggregates on the volumetric properties of specimens compacted with the Superpave gyratory compactor. This paper is divided into two parts: Part I reports the results of the study carried out to evaluate the effect of restricted zone on volumetric and gyratory properties of HMA samples, and Part II describes the study carried out to evaluate the difference in correction factor at different gyration levels. Figures, tables, references. 26p.
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