The physical difference using penetrometer method to test compaction on granular recycled materials where applying the correct method as prescribed within SROH.

Recycled Granular 150mm layers – 8 passes 50kg vibrotamper

As compared against backfill of excavation to full 900mm depth using exactly the same material but only compacting the surface and is in direct contravention of requirements of SROH.

Recycled Granular 900mm layer – 8 passes 50kg vibrotamper