Abstract: The fluidity is one of the important indicators of liquid soils. Currently, there is no national or industrial standards for its evaluation method. Firstly, the specifications for materials such as concrete and cement mortar were compared to clarify the similarities and differences between different testing methods. Then, the fluidity of the liquid soil was tested using truncated cone molds and cylindrical containers, and a comparative analysis was conducted. The results show that the principles of the current relevant standards for measuring the material fluidity are the same, but the difference lies in the different experimental devices. When the fluidity of the liquid soil is between 160mm-300mm, the results obtained by using truncated cone molds and cylindrical containers are basically the same, and both can be used as testing instruments for the fluidity of the liquid soil; When the flowrate exceeds 300mm, the flowrate measured using a cylindrical container is significantly higher than that measured using a truncated cone mold.

Key words: Liquid Soils, Fluidity, Test Methods, Cylindrical Container, Truncated Cone Mold