Use of proctor compaction testing for deep fill construction using impact rollers

Rolling Dynamic Compaction (RDC) is a generic term associated with densifying ground using non-circular (impact) rollers. RDC is suited to deep fill applications because of the ability to compact ground efficiently by means of its faster operating speed (10–12 km/h) and greater depth of influence when compared to conventional circular rollers. Whilst conventional circular rollers are able to compact layer thicknesses typically in the range of 200–500 mm, thicker layers are able to be compacted using RDC. This paper discusses performance based specifications and the applicability of both the Standard and Modified Proctor compaction tests to RDC. For projects where impact rollers are used, the Modified Proctor test is strongly recommended as the energy imparted onto the soil is more representative than the Standard test.Brendan Scott, Mark Jaksa, Yien Lik Ku