Abstract: The stabilized dredged silt is used as embankment filling materials, which can not only solve the disposition of silt, but also solve lack of filling materials in the embankment construction. Silt is stabilized by ash-slag cementitious materials (HAS); and some physico-mechanical characters of stabilized silt are measured. Result shows that the liquid limit of silt added 6 % HAS accounts 60 % and organic matter reduce to 2 % after stacked 28 days, and silt is changed into MH from CHO in soil classification. Those mechanical characters such as, the 28 days unconfined compressive strength of stabilized silt reach 1.4 MPa; and cohesion c≥ 100 kPa; friction angles ?＞35°; permeability coefficient is less than 10-6 cm/s; which outclass the standard of embankment filling materials. All those show that it is feasible to use stabilized silt with HAS as embankment filling materials.

Key words: ash-slag cementitious materials, stabilization, silt, shear strength, permeability coefficient