United States Department of Transportation
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A laboratory investigation into the effects of aggregate-related factors of critical VMA in asphalt paving mixtures.
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2000-06-01
[PDF-721.13 KB]
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Abstract:This report summarizes research conducted at Iowa State University on behalf of the Iowa
Department of Transportation, focusing on the volumetric state of hot-mix asphalt (HMA)
mixtures as they transition from stable to unstable configurations. This has traditionally been
addressed during mix design by meeting a minimum voids in the mineral aggregate (VMA)
requirement, based solely upon the nominal maximum aggregate size without regard to other
significant aggregate-related properties. The goal was to expand the current specification to
include additional aggregate properties, e.g., fineness modulus, percent crushed fine and coarse
aggregate, and their interactions. The work was accomplished in three phases: a literature review,
extensive laboratory testing, and statistical analysis of test results.
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