Study on the Mechanical Properties and Mechanism Analysis of Loess Improved by Composite Phase Change Materials under Freeze-thaw Conditions
To mitigate the detrimental impact of freeze-thaw cycles on loess mechanical properties,a method using expanded graphite-n-tetradecane composite phase change material(EG-C14)was pro-posed,leveraging the temperature modulation capability of phase change materials.Focusing on the Lanzhou loess,a series of tests were conducted after typical freeze-thaw cycles,including volumetric deformation tests,mechanical property tests,and microstructure tests on loess samples with varying EG-C14dosage levels.The study aimed to explore the influence of different EG-C14 dosages on loess mechanical properties under freeze-thaw conditions and its enhancement mechanism.Results indicate that EG-C14 effectively mitigated the temperature variations within the soil during freeze-thaw cycles,thereby suppressing soil expansion and contraction deformation.Additionally,EG-C14 minimized soil microstructure damage during freeze-thaw cycles.Enhanced soil exhibited reduced scaffold porosity and denser particle skeleton compared to untreated loess after multiple cycles,thus improving its me-chanical properties.Furthermore,EG-C14 dosage positively correlated with enhanced mechanical prop-erties,stabilizing notably at a 4％dosage.These findings offer valuable insights for deploying EG-C14 enhanced loess in practical applications.
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