Abstract:
Contiguous aggregates are aggregate sizes that consecutively follow a typical aggregate grading curve. Porosity
calculation is possible for a binary or longer ranges of contiguous aggregates. Porosity is a fundamental density
indicator and can indirectly be an indicator of permeability potential. The traditional Bailey method follows the
principle of the ratio of void size to aggregate or simulated sphere diameter that ensures optimal aggregate
packing of the aggregate skeleton. In this paper, the Bailey method description of the grading curve and defined
control sieves were used as a reference, allowing the description of various Rational Bailey Ratios adhering to
contiguous aggregate fractions in these ratios. Thus, porosity calculations can be done for the contiguous
aggregate fractions in these defined Rational Bailey Ratios on the normal aggregate grading curve. Recent
research work on asphalt mix design compaction, air void distribution, stiffness, rut resistance, correlation with
permeability predictors, and density indicate Rational Bailey Ratios can be used for the optimization of HMA mix
designs via benchmarking. This approach is described as the Contiguous Aggregate Packing benchmark
methodology.
