Phase Transition and Rheological Behavior of Fluidized Stabilized Soil UnderSteady-state and Dynamic Conditions
LEI Baofeng1,2, SUN Jucong1,2, JU Peng1,2, FAN Henghui1,2,*, REN Guanzhou1,2, XIE Feihan1,2
1 College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, Shaanxi, China 2 Institute of Geotechnical Engineering/Museum of Problematic Rock and Soil, Northwest A&F University, Yangling 712100, Shaanxi, China
Abstract: Fluidized stabilized soil, a solid-liquid composite material with high water content, exhibits diverse rheological behaviors during mixing, transportation, and pumping processes. To investigate its phase transition characteristics and rheological evolution, steady-state shear and amplitude sweep tests were conducted on fresh fluidized stabilized soil paste with varying water contents and stabilizer dosages using an MCR 92 rheometer. The mechanisms were further elucidated through scanning electron microscopy, super-depth microscopy, and Zeta potential analysis. Key findings include: (1) The paste undergoes a solid-to-liquid phase transition with increasing shear rate. Apparent viscosity decreases sharply at low shear rates (0—15 s-1), demonstrating shear-thinning behavior, while Bingham fluid characteristics dominate at higher shear rates (15—40 s-1). (2) Dynamic shear stress initially increases, then decreases, and subsequently rises with increasing shear strain. Both storage and loss moduli decrease, while the loss factor remains stable at low shear strains (0.001%—1%) but surges at high strains (10%—100%), indicating enhanced viscous behavior. (3) Reduced water content and increased stabilizer dosage amplify steady-state parameters (yield stress, plastic viscosity) and dynamic parameters (maximum dynamic shear stress, storage/loss moduli, flow point stress), thereby improving structural stability. The influence of stabilizer dosage diminishes at higher water contents. Interparticle interactions and electric double-layer theory effectively explain the rheological mechanisms.
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2026, Vol. 40 
