Abstract: Because of high water content, low strength and low permeability, dredged clays could not be directly used as engineering materials. Dump-disposing for dredged clays always occupies a large scale of ground and these resources were wasted. Based on traditional solidification method, a new flow-solidification method is put forward which considering the current dredging method in China. And this method can deal with dredged clays with high water content efficiently. In order to study the fluidity of the treated mixtures, a series of laboratory fluidity tests have been performed. The experimental results show that both the initial water content and the adding quantity of solidification agent have good linear relationship with the fluidity of the mixtures. And there exists a critical value of the initial water content for flow-solidification; and the critical value is 2.5 times of the liquid limit. A concept of generalized water-cement ratio is defined; and a prediction method of fluidity is established based on initial water content and adding quantity of solidification agent. Finally, the validity of the proposed formula is verified.

Key words: dredged clays, flow-solidification, flow-value test, generalized water-cement ratio, prediction method