Permeability of coarse-graded materials was shown to depend more on void ratio and pore characteristics than on aggregate type or particle size parameters. Two analytical methods based on pore properties are presented for estimating permeability based on gradation, state of compaction, and pore size distribution. This study demonstrated that pore size measurements obtained using X-ray CT scanning techniques can be used to estimate permeability using a relatively simple empirical approach in which the pore size of 80% passing is correlated to permeability. Results from multiple constant head permeability tests conducted on 10-inch-diameter samples of 14 different coarse-grained soils (crushed aggregates) indicates that the two empirical approaches described herein represent reasonable approaches for estimating the permeability of soils similar to those evaluated in this study.
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