Experimental study on the influence of different admixtures on the disintegration characteristics of fluid-consolidated soil

Due to its special physical and chemical properties, loess is prone to disintegration under natural conditions of freeze-thaw cycles, which in turn affects the safety and durability of engineering construction. To address this issue, five different materials—cement, quicklime, fly ash, polypropylene fiber, and steel fiber-reinforced polymer—were selected to prepare fluidized solidified soil. Through indoor simulated freeze-thaw cycle experiments, the disintegration characteristics under different materials and different numbers of freeze-thaw cycles were analyzed to evaluate the improvement effects, leading to the following conclusions: Cement, quicklime, and cement–steel fiber composites showed relatively good improvement effects, with varying degrees of reduction in disintegration rate and disintegration speed; fly ash and polypropylene fiber only slowed the disintegration rate in the absence of freeze-thaw cycles; the cement–steel fiber composite material had better improvement effects than a single material (cement). Freeze-thaw cycles have a promoting effect on soil disintegration.