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The permeability of five types of drainage base course materials (i. e. single-sized crushed stones that were either asphalt treated or untreated, sand, mechanical stabilized crushed stones, and drainage asphalt mixtures) were studied through constant-head permeability tests at laboratory. Three parameters (permeability coefficient k, turbulent flow parameters m and n) were introduced to describe the drainage behavior. Four aspects of the material properties, in terms of the average grain size dmean, void ratio, p2.36 and p0.075, were used to analyze the experimental results. The relevant findings were presented. It was indicated that errors might have been induced while using Darcy's law to estimate the discharge velocity irrespective of the flow states.

PERMEABILITY OF DRAINAGE BASE COURSE MATERIALS AT LABORATORY TESTS