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Red clay is a special kind of soil rich in iron, aluminum and colloidal substances. Formed through the weathering of parent rocks (laterization), it is widely used as the foundational material in construction. The content and form of free oxides in red clay determine its special mechanical properties. The initial morphology of red clay was prepared with iron sol and kaolin, and the laws and mechanisms of free oxides in the process of structural strength formation and strength growth of red clay were investigated considering the environmental factors such as temperature, dry and wet cycles, and maintenance period. The results of the study showed that: the unconfined compressive strength of the in situ clay was significantly higher than that of the remolded clay, and the remolding had destroyed the free iron oxide cementation and the chemical bond at the pinnatite kaolin interface; the sensitivity was increased by extending the maintenance time; the particle linkage in the consolidation test was predominantly destroyed by “toughness”, and the content of free iron oxides was mainly damaged. prolonged sensitivity; consolidation test particle bonding to “toughness” destruction, free iron oxide content increased to reduce the pore ratio of 15% to 20%; compression coefficient reduced by 30% to 40% mechanical stability; 100 °C high temperature to accelerate the transformation of acicular ferrite to hematite; free iron oxide adsorption of clay particles through the Coulomb force Free iron oxide adsorbs the clay particles through Coulomb force to form condensate, and the dry density increases from 1.2 g/cm3 to 1.4 g/cm3, and the molecular arrangement compactness and deformation resistance are improved. The mechanical stability of artificial red clay is positively correlated with the free iron oxide content, and its cementation is the core mechanism to regulate the process of red clay and mechanical properties. The electrodialysis purification technique can effectively eliminate the chemical interference, which provides a new method for the quantitative study of the cementation of red clay.

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Investigation of Mechanical Properties and Cementation of Artificially Prepared Red Clay

  • 会议论文

  • 发表日期：

    2026年

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  • Yong Wang,
  • Bin-Hong Gan,
  • Xiao-Xue Yan,
  • Shang-Song Han,
  • Shan-Shan Li,
  • Min Yan

摘要

Red clay is a special kind of soil rich in iron, aluminum and colloidal substances. Formed through the weathering of parent rocks (laterization), it is widely used as the foundational material in construction. The content and form of free oxides in red clay determine its special mechanical properties. The initial morphology of red clay was prepared with iron sol and kaolin, and the laws and mechanisms of free oxides in the process of structural strength formation and strength growth of red clay were investigated considering the environmental factors such as temperature, dry and wet cycles, and maintenance period. The results of the study showed that: the unconfined compressive strength of the in situ clay was significantly higher than that of the remolded clay, and the remolding had destroyed the free iron oxide cementation and the chemical bond at the pinnatite kaolin interface; the sensitivity was increased by extending the maintenance time; the particle linkage in the consolidation test was predominantly destroyed by “toughness”, and the content of free iron oxides was mainly damaged. prolonged sensitivity; consolidation test particle bonding to “toughness” destruction, free iron oxide content increased to reduce the pore ratio of 15% to 20%; compression coefficient reduced by 30% to 40% mechanical stability; 100 °C high temperature to accelerate the transformation of acicular ferrite to hematite; free iron oxide adsorption of clay particles through the Coulomb force Free iron oxide adsorbs the clay particles through Coulomb force to form condensate, and the dry density increases from 1.2 g/cm3 to 1.4 g/cm3, and the molecular arrangement compactness and deformation resistance are improved. The mechanical stability of artificial red clay is positively correlated with the free iron oxide content, and its cementation is the core mechanism to regulate the process of red clay and mechanical properties. The electrodialysis purification technique can effectively eliminate the chemical interference, which provides a new method for the quantitative study of the cementation of red clay.