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<p>Earthen sites have been exposed to the natural environment for a long time, resulting in damage to their walls. Tuff powder solidified soil is a potential material that can be used as the rammed reinforcement and can also achieve the utilization of solid waste. Therefore, the influences of different tuff powder dosages and curing times on mechanical properties, stability, appearance compatibility, and environmental adaptability of the soil were studied. The results showed that the unconfined compressive strength of the solidified soil first decreased and then increased with increasing dosage during the early curing stage (3 d, 7 d, and 14 d). In contrast, the strength increased with the increase in dosage during the later curing stage (28 d), reaching a maximum value of 4.425&#xa0;MPa, which was 47.72% higher than that of the sample with 0% dosage. The increase in dosage and curing time could reduce the disintegration (disintegration mass decreased from 222.67&#xa0;g to 23.22&#xa0;g after 28 d) and improve the compressive resistance. The color difference increased with dosage increasing, but all were less than 6. The water absorption and desorption capacity weakened and air permeability decreased with dosage increasing, and the maximum reduction in the wet flow density was 25.20%. Microscopic analysis revealed that some substances in tuff powder and loess were dissolved and the geopolymer gel gradually formed. The gels filled the small pores and mesopores, thereby optimizing the pore structure and enhancing the overall performance of the soil. Based on the “performance trade-off effect” of various performances changing with dosage, the recommended dosage ranges under different engineering scenarios were proposed. This study provides engineering references for the reinforcement in earthen sites.</p>

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Effect of Tuff Powder Dosage on Performance of Solidified Soil Used for Erosion Restoration of Earthen Sites

  • 期刊论文

  • 发表日期：

    2026年3月4日

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  • Dandan Li,
  • Yaling Chou,
  • Erxing Peng,
  • Xiaoying Hu

摘要

Earthen sites have been exposed to the natural environment for a long time, resulting in damage to their walls. Tuff powder solidified soil is a potential material that can be used as the rammed reinforcement and can also achieve the utilization of solid waste. Therefore, the influences of different tuff powder dosages and curing times on mechanical properties, stability, appearance compatibility, and environmental adaptability of the soil were studied. The results showed that the unconfined compressive strength of the solidified soil first decreased and then increased with increasing dosage during the early curing stage (3 d, 7 d, and 14 d). In contrast, the strength increased with the increase in dosage during the later curing stage (28 d), reaching a maximum value of 4.425 MPa, which was 47.72% higher than that of the sample with 0% dosage. The increase in dosage and curing time could reduce the disintegration (disintegration mass decreased from 222.67 g to 23.22 g after 28 d) and improve the compressive resistance. The color difference increased with dosage increasing, but all were less than 6. The water absorption and desorption capacity weakened and air permeability decreased with dosage increasing, and the maximum reduction in the wet flow density was 25.20%. Microscopic analysis revealed that some substances in tuff powder and loess were dissolved and the geopolymer gel gradually formed. The gels filled the small pores and mesopores, thereby optimizing the pore structure and enhancing the overall performance of the soil. Based on the “performance trade-off effect” of various performances changing with dosage, the recommended dosage ranges under different engineering scenarios were proposed. This study provides engineering references for the reinforcement in earthen sites.