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<p>Salt crystallization is one of major factors contributing to rock deterioration. In this study, the sandstone from the Shimao site was subjected to controlled salt crystallization cycles under conditions simulating in situ environments. Instead of the conventional 14% concentration specified in EN 12370, we used 5% solutions of Na₂SO₄, MgSO₄, and NaCl, with drying conducted at 70 °C. A series of physical parameters and mechanical properties were evaluated before and after the salt crystallization cycles. Repeated crystallization during the wet-dry cycles resulted in the development of pronounced weathering surface cracks, particularly in sulfate-treated samples. These were accompanied by cement loss and pore enlargement within the rock matrix. Among these salts, MgSO₄ caused the most severe damage, followed by Na₂SO₄ and NaCl. The findings emphasize that even at lower salt content, the occurrence of weathering, increased roughness, weight loss, the development of fissures and changes in uniaxial compressive strength can be detected.</p>

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Soluble salt crystallization effect on the weathering of sandstone at the Shimao site

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月10日

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  • Dan Huang,
  • Fanghao Liu,
  • Kezhu Han,
  • Mantang Ge,
  • Yaru Zong,
  • Yujia Luo,
  • Yuhu Li

摘要

Salt crystallization is one of major factors contributing to rock deterioration. In this study, the sandstone from the Shimao site was subjected to controlled salt crystallization cycles under conditions simulating in situ environments. Instead of the conventional 14% concentration specified in EN 12370, we used 5% solutions of Na₂SO₄, MgSO₄, and NaCl, with drying conducted at 70 °C. A series of physical parameters and mechanical properties were evaluated before and after the salt crystallization cycles. Repeated crystallization during the wet-dry cycles resulted in the development of pronounced weathering surface cracks, particularly in sulfate-treated samples. These were accompanied by cement loss and pore enlargement within the rock matrix. Among these salts, MgSO₄ caused the most severe damage, followed by Na₂SO₄ and NaCl. The findings emphasize that even at lower salt content, the occurrence of weathering, increased roughness, weight loss, the development of fissures and changes in uniaxial compressive strength can be detected.