Dredged material (DM) solidification technique was gradually put into engineering application in China

determination of the compressibility behavior cement-treated clays is of great importance to direct DM solidification engineering. Compressibility behaviour of cement solidified dredged material (SDM) was conducted through single factor experiment considering initial water content

cement content and curing time in the oedometer tests. Results show that the significant characteristics for the SDM compressibility is there exist a yield stress

when external load is below the yield stress; the compressibility is very low

however

once the external load exceed the yield stress

the compressibility of the SDM suddenly increases to more than 20 times at the post-yield state than that pre-yield state

and is also larger than that of the untreated dredged material. The untreated dredged material is belong to high compressibility soil according to criterion

and the cement treated dredged material transfers to medium or low compressibility soil. Yield stresses of SDM increase linearly with increased cement content; lower water content and longer curing time get larger yield stresses. The compressibility behaviour of SDM is similar to that of the natural sedimentary soils

double logarithm compression pattern is fitted to depict the sudden drop compressibility behaviour of SDM.