Stiffness behaviour of trial road foundations.

This paper reports the results of two full-scale field trials to determine the stiffness and density of granular materials receiving different levels of compaction energy and support. The research showed that there were greater improvements in density with initial input of compaction energy, and yet little change in density, but significant increases in stiffness, with the final applications of compaction energy. Density is thus an inappropriate indicator of performance (i.e. resilient elastic stiffness)