Fluidized solidified soil and its workability and strength based on pumping construction

Liquidity and compressive strength are key technical indicators in the application of fluidized solidified soil engineering, which determine the construction and workability of fluidized solidified soil and its workability of construction. During pumping construction, reducing the wet density and appropriately improving the flowability of the solidified soil can meet equipment requirements. Using two types of engineering waste soil as parent soil, with a wet density controlled between 1.4 g/cm³ and 1.6 g/cm³, high flowability fluid-solidified soil was prepared. The focus was on investigating the control laws and mechanisms of soil properties and wet density on the flowability, bleeding rate, and compressive strength of fluid solidified soil. Research has shown that the flowability and bleeding rate of fluidized solidified soil are mainly affected by soil properties. The higher the liquid limit of the parent soil, the lower its flowability and bleeding rate. The dosage and type of solidifying agent have relatively insignificant effects on it; the compressive strength is mainly affected by the wet density and curing agent. The higher the wet density, the relatively greater the strength of the fluidized solidified soil. During the self-setting stage of highly fluid solidified soil, the hydration reaction has not yet been fully carried out. The soil particles and hydration products of the soil solidifying agent have self-weight settlement, resulting in varying degrees of bleeding. This leads to uneven compressive strength of the same solidified soil sample along the depth. The microstructure shows that large pores are gradually filled by hydration products, and the bonding effect is more complete. Small and medium-sized pores increase in sequence, and the soil structure is denser.