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<p>Fluidized solidified soil (FSS) is an innovative backfill material that offers benefits such as easy pumping and straightforward construction. This study examined how varying the water-soil ratio and the curing agent dosage affect the properties and microstructure of FSS. The strength development mechanism was investigated when composite solidification agents were used. The findings show that both the water-solid ratio and the curing agent dosage can affect the microstructure of FSS, thereby affecting its performance. When the water-solid ratio increases from 0.52 to 0.56, the unconfined compressive strength (UCS) and flexural strength of the FSS decrease by 34.1% and 39.3% after 28 d. Conversely, the curing agent dosage increasing from 10% to 30% will increase both UCS and flexural strength by 11.2 times and 11.1 times. As the curing age increases, the number of cracks at failure point in the FSS will increase and lead to a more complete failure. Numerous needle-like AFt, C-S-H gel, and C-(A)-S-H gel create a three-dimensional network by adhering to soil particles.</p>

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Performance and Characterization of Fluidized Solidified Soil Prepared by Synergistic Cement and Phosphogypsum with Slag Powder-Fly Ash

  • 期刊论文

  • 发表日期：

    2025年10月29日

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  • Shujie Chen,
  • Chao Feng,
  • Tengfei Fu,
  • Demei Yu,
  • Hengchun Zhang,
  • Feng Zhang,
  • Yao Wang,
  • Xia Huang,
  • Yulin Wang

摘要

Fluidized solidified soil (FSS) is an innovative backfill material that offers benefits such as easy pumping and straightforward construction. This study examined how varying the water-soil ratio and the curing agent dosage affect the properties and microstructure of FSS. The strength development mechanism was investigated when composite solidification agents were used. The findings show that both the water-solid ratio and the curing agent dosage can affect the microstructure of FSS, thereby affecting its performance. When the water-solid ratio increases from 0.52 to 0.56, the unconfined compressive strength (UCS) and flexural strength of the FSS decrease by 34.1% and 39.3% after 28 d. Conversely, the curing agent dosage increasing from 10% to 30% will increase both UCS and flexural strength by 11.2 times and 11.1 times. As the curing age increases, the number of cracks at failure point in the FSS will increase and lead to a more complete failure. Numerous needle-like AFt, C-S-H gel, and C-(A)-S-H gel create a three-dimensional network by adhering to soil particles.