Abstract
Field and laboratory tests were conducted to investigate the degree of strength variance on large-scale artificial ground. The ground was constructed by pneumatic flow mixing method, in which dredged soil and cement are mixed in a pipe during transforming. Stability of monitoring and controlling system on cement-water ratio of treated soil was observed. It was also observed that the effect of the transforming distance on the strength variance was negligible as far as the distance exceeds around 650m. However there were relatively large influences of non-homogeneity of dredged grounds, though the area of the dredged ground was divided to have similar physical properties of soil so that the quality control was significantly improved. The effects of placements of treated soils in water, sampling methods and laboratory test conditions were also discussed.
