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Field density measurements and compaction tests on uniform sand placed hydraulically and without subsequent compaction showed a linear correlation between percent compaction and relative density, the mean values for the fill being 89.3 ± 3 percent and 50 ± 16 percent, respectively.
It was found that the maximum density obtained in compaction tests is strongly affected by apparently minor variations in grain size distribution. Hence, to obtain reliable estimates of percent compaction, it was found necessary to perform a one-point compaction test on the soil excavated from each field density test hole, rather than applying one compaction test to a whole series of field density test results.
Some advantages of percent compaction over relative density, as a measure of degree of compaction, are enumerated.
cohesionless soils, density (mass/volume), sands, soil compaction, compaction tests, percent compaction, field density, hydraulic fill
President, Geotechnical Engineers, Inc., Winchester, Mass.
Soils engineer, Praeger-Kavanagh, Waterbury, N. Y.