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Volume 47 Issue 4
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XU Yunshan, XIAO Zilong, SUN Dean, LI Jianping. Effects of occurrence form of free iron oxide on thermal conductivity of lateritic clay during drying and wetting conditions[J]. Chinese Journal of Geotechnical Engineering, 2025, 47(4): 811-819. DOI: 10.11779/CJGE20240058
Citation: XU Yunshan, XIAO Zilong, SUN Dean, LI Jianping. Effects of occurrence form of free iron oxide on thermal conductivity of lateritic clay during drying and wetting conditions[J]. Chinese Journal of Geotechnical Engineering, 2025, 47(4): 811-819. DOI: 10.11779/CJGE20240058
shu

Effects of occurrence form of free iron oxide on thermal conductivity of lateritic clay during drying and wetting conditions

  • 1.

    Key Laboratory of Underground Engineering of Fujian Provincial Universities, Fujian University of Technology, Fuzhou 350118, China

  • 2.

    Department of Civil Engineering, Shanghai University, Shanghai 200444, China

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  • Received Date: January 16, 2024
  • Available Online: August 20, 2024
    Graphical Abstract
    • Abstract
  • The influences of occurrence form of free iron oxide (FIO) on the thermal conductivity of lateritic clay are still unclear. In this study, the thermal probe method is used to measure the thermal conductivity (TC) of undisturbed and compacted specimens before and after removing FIO. Combined with the evolution of microstructural characteristics, the influence mechanism of FIO and the specimen preparation method on TC is investigated. The thermal conductivity test results show that the TC of compacted specimens is lower than that of undisturbed specimens (US) under the same water content, with an average decrease of about 4.8%. After removing FIO, the TC of the US significantly increases, with an average increase of about 29.3%. Moreover, the hysteresis phenomenon between the TC and the volumetric water content of US after FIO removal is weakened. The microscopic test results show that the pore number in US after FIO removal is significantly less than that in untreated specimens. There are a small number of larger pores with a pore size of ~10 μm in US without FIO removal. The larger pores are basically eliminated in US after FIO removal. The mechanism by which FIO affects the TC of lateritic clay can be understood as: FIO can aggregate and bond soil particles or aggregates in the form of "encapsulation", "bridging", and "attachment". After removing FIO, some larger aggregates are dispersed into smaller aggregates or soil particles, which in turn fill the larger pores, increasing the contact and heat transfer paths between soil particles.
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