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<p>In this study, carbide slag, fly ash, cement, and sodium sulfate were used to stabilize silt from the Yellow River Alluvial Plain. An orthogonal test was conducted to evaluate the optimal mix design for soil stabilization. The mechanical properties, hydration products, and microstructure of the stabilized silt were examined. The effects of stabilizer concentration, compaction, and moisture content on the mechanical properties were investigated. Based on mechanical performance, the optimal stabilizer mix was found to consist of 30% cement, 13.6% carbide slag, 54.4% fly ash, and 2% sodium sulfate. The results indicated that the California Bearing Ratio (CBR), unconfined compressive strength, and splitting tensile strength of the stabilized silt increased with higher stabilizer dosage and compaction degree. In the early stages, the hydration products of the stabilized silt were primarily calcium hydroxide, ettringite, and C-S–H, which exhibited a loose structure. Over time, the microstructure densified, and more crystalline C-S–H was formed. This study provides valuable insights into the use of industrial by-products for soil stabilization, offering a sustainable and cost-effective solution to improve the strength and stability of silt in construction projects.</p>

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Stabilization of Silt with High Dosages of Carbide Slag and Fly Ash: Mechanical Properties and Microstructural Insights

  • 期刊论文

  • 发表日期：

    2025年6月18日

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  • Yanhua Guan,
  • Baowei Li,
  • Linglai Bu,
  • Yao Ran,
  • Zhenhuan Li,
  • Renjuan Sun,
  • Yunlong Li,
  • Shengtao Zhang

摘要

In this study, carbide slag, fly ash, cement, and sodium sulfate were used to stabilize silt from the Yellow River Alluvial Plain. An orthogonal test was conducted to evaluate the optimal mix design for soil stabilization. The mechanical properties, hydration products, and microstructure of the stabilized silt were examined. The effects of stabilizer concentration, compaction, and moisture content on the mechanical properties were investigated. Based on mechanical performance, the optimal stabilizer mix was found to consist of 30% cement, 13.6% carbide slag, 54.4% fly ash, and 2% sodium sulfate. The results indicated that the California Bearing Ratio (CBR), unconfined compressive strength, and splitting tensile strength of the stabilized silt increased with higher stabilizer dosage and compaction degree. In the early stages, the hydration products of the stabilized silt were primarily calcium hydroxide, ettringite, and C-S–H, which exhibited a loose structure. Over time, the microstructure densified, and more crystalline C-S–H was formed. This study provides valuable insights into the use of industrial by-products for soil stabilization, offering a sustainable and cost-effective solution to improve the strength and stability of silt in construction projects.