ABSTRACT
In order to investigate the effectiveness of ground improvement methods using chitosan (CS) and carboxymethyl cellulose (CMC), which are biomass-derived polymeric materials, unconfined compression test and triaxial compression test were conducted on specimens compacted after mixing CS and CMC with soil. The results showed that the improved soil had much greater strength than the untreated soil. The dilatancy properties were also found to be different, suggesting that the critical state constant was different. The greater the concentration of CMC solution, the greater the strength; and the most effective mass ratio of CS to CMC was 2 to 3 times CS to CMC.
