Abstract:

How to treat dredged clayey soils with high initial water contents is an important issue in engineering practice. A new solidification method by adding cement and phosphogypsum synchronously is proposed based on traditional cement-treatment method. A series of laboratory tests were performed on the treated soils. The experimental results show that the unconfined compressive strength of solidified soils increases remarkably by adding cement and phosphogypsum synchronously compared with those treated only by cement. There is an optimum addition content of phosphogypsum for solidification treatment. The optimum addition content increases with the increase of initial water content of dredged clays. The stress-strain curves of solidified soils indicated the range of the failure strain about 2%-3%. The relationship between E50 and strength is nearly linear.

Key words: cement and phosphogypsum, dredged clays with high water content, solidification, unconfined compressive strength