Experimental study of freeze–thaw deformation in soil modified with phase change materials

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Transportation Geotechnics Pub Date : 2025-09-12 DOI:10.1016/j.trgeo.2025.101719

Xiaoqiang Liu , Kravchenko Ekaterina , Yao Liu , Wei Ma , Jiankun Liu , Zhifeng Ren

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引用次数: 0

Abstract

Previous studies have confirmed the potential use of phase change materials (PCMs) in reducing temperature fluctuations in soil. However, PCM’s impact on soil volumetric deformation due to freeze–thaw (F-T) cycles remains understudied. To address this gap, the thermal conductivity, Atterberg limit, permeability, and F-T deformation were investigated for the control and two PCM-modified soils. PCM-A and PCM-B were utilized in modifying the soil, which had phase change points of 10.65°C and −2.75°C, respectively. The results reveal that PCM-modified soils have less F-T deformation than the control soil, with PCM-A showing the least deformation. The increased plastic limit, decreased thermal conductivity, reduced permeability coefficient and decay of supercooling temperature reveal that the F-T deformation of PCM-modified soil diminishes with the addition of PCM. For PCM-A, a plastic limit exceeding its moisture content of 18 %, lower thermal conductivity, and an approximately equal permeability coefficient indicate the least frost heave during freezing. Based on grey incidence analysis, the phase change temperatures have a minimal impact on F-T deformation compared to other physical properties. The difference in the grey incidence between frost heave and phase change temperatures also indicates the stronger restraining effect of PCM-A on soil’s frost heave. PCM-A with an optimal content not exceeding 6 % is recommended for restricting F-T deformation.

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相变材料改性土冻融变形试验研究

以前的研究已经证实相变材料（PCMs）在减少土壤温度波动方面的潜在用途。然而，由于冻融循环（F-T）， PCM对土壤体积变形的影响仍未得到充分研究。为了解决这一差距，研究了对照和两种pcm改性土壤的导热系数、阿特伯格极限、渗透率和F-T变形。利用PCM-A和PCM-B改性土壤，相变点分别为10.65°C和- 2.75°C。结果表明：pcm改性土的F-T变形小于对照土，其中PCM-A的变形最小；塑性极限的提高、导热系数的降低、渗透系数的降低以及过冷温度的衰减表明，PCM改性土的F-T变形随PCM的加入而减小。对于PCM-A，超过18%含水率的塑性极限、较低的导热系数和近似相等的渗透系数表明冻结过程中霜胀最小。基于灰色关联分析，相变温度对F-T变形的影响较小。冻胀与相变温度灰关联度的差异也表明PCM-A对土体冻胀的抑制作用较强。PCM-A的最佳含量不超过6%，建议用于限制F-T变形。

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来源期刊

Transportation Geotechnics Social Sciences-Transportation

CiteScore

8.10

自引率

11.30%

发文量

194

审稿时长

51 days

期刊介绍： Transportation Geotechnics is a journal dedicated to publishing high-quality, theoretical, and applied papers that cover all facets of geotechnics for transportation infrastructure such as roads, highways, railways, underground railways, airfields, and waterways. The journal places a special emphasis on case studies that present original work relevant to the sustainable construction of transportation infrastructure. The scope of topics it addresses includes the geotechnical properties of geomaterials for sustainable and rational design and construction, the behavior of compacted and stabilized geomaterials, the use of geosynthetics and reinforcement in constructed layers and interlayers, ground improvement and slope stability for transportation infrastructures, compaction technology and management, maintenance technology, the impact of climate, embankments for highways and high-speed trains, transition zones, dredging, underwater geotechnics for infrastructure purposes, and the modeling of multi-layered structures and supporting ground under dynamic and repeated loads.