To improve the construction surplus soil and to use the soil as a geomaterial, a densification technology of soil with high water content such as dewatered sludge is studied. The densification is brought by the change from the ‘consolidation material’ like clay to the ‘compactable material’ like sand. The soil is crushed with air to an assembly of clay pebbles, the water content of which is ease to decrease, and therefore the assembly can be compacted to high density without long consolidation time. The soil became low compressible and had high shear resistance, which can be describe by Super/subloading Yield Surface model.