The bead-treated lightweight soil made from dredged sludge is a new kind of geo-materials with light density and high undrained shear strength.It can be used widely in civil engineering

highway engineering

etc.In this study

the dredged sludge of Baima Lake

beads and cement（32.5#） are used to make the mix proportion researches

and two key parameters of the lightweight soil（the density and the unconfined strength） at different cement dosages

EPS volume dosages and curing periods are discussed.The results show that the density of the lightweight soils is mainly influenced by the EPS volume dosage

while the strength is influenced by all the factors including the cement dosage

EPS volume dosage and curing period.It is emphasized that the relation between the strength and the cement dosage and curing period is similar to the common cemented soils

and there is a threshold of EPS volume dosage for the strength.