9.2.6 Lightweight Fill
In embankment constructions, lightweight fill can reduce the driving force of the slope and thereby increase its stability (Figure 6). Materials, such as slag, encapsulated sawdust, expanded shale, cinders, shredded rubber tires, polystyrene foam, and seashells, have been used successfully for this purpose. Selection of a suitable type of material depends on its cost and availability in local areas.
Figure 6: Application of light weight fill