Higher densities, better physical properties, all civil engineering graduates know this. The specification for highway works has a method specification for general soil compaction and an end of product density for special fills. Now special fills that require density measurements are generally those behind structures, with limited space and therefore limited choice of compaction plant, you can begin to understand this, especially as the structure will not move. Where do you feel serious bumps on motorways? generally at structures. So is density measurement working?

The difficulty I approach, is returning to measuring densities on general embankment fill, the method compaction …