Abstract
In general, a high strength soil improvement can be achieved by increasing cement amount or decreeing water-cement ratio(w/c). However, because cement milk of low water-cement ratio is viscous, when the cement milk with w/c under 60% is used in the soil improvement, the pressure feed of cement milk cannot be performed. To solve this problem, fluidizers are used with cement milk. On the other hand, in the field of concrete it is known that mobility will increase by mixing urea with concrete. In this research, the attention is paid to fluid improvement mixing urea with soil -cement water. Laboratory experiments and field experiments were conducted to clarify the effect of using urea on the improved mixed soil by discussing its strength variation and mobility.
