With the extensive use of aggregate material in highway construction (primarily subbase) in Pennsylvania, the Pennsylvania Department of Transportation (PennDOT) initiated an indepth analysis of results of laboratory and field compaction tests on aggregates. This study determined what field and laboratory tests are best correlated to produce the optimum compaction control technique for subbase materials.
Results of approximately 500 sand cone and nuclear field densities in crushed limestone, gravel, and slag material at 17 construction sites throughout the state are summarized and compared. Laboratory density tests on material from each of these field test sites include vibratory, standard moisture-density, modified moisture density, the Marshall test, and the vibratory hammer test. Regression correlation analyses are performed between maximum attainable field and laboratory densities. Estimating linear equations for predicting relationships between field and laboratory maximum densities are developed and their significance is discussed.
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