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<p>In order to improve the overall performance of EPS fluid lightweight soil (FLS), EPS particles were precoated. The effects of modifier concentration, coating material type, coating material ratio, and coating material dosage on the coating integrity index (CII) of EPS and FLS strength were investigated and analyzed. Based on this, the optimal precoating scheme for EPS particles was determined. The test results showed that when the EPS was modified with 10% ethylene vinyl acetate (EVA) emulsion, MgO and cement were used as the composite coating materials, the mass ratio of the two was 4:6, and the amount of coating materials was 5 times of the mass of EPS, the coating effect of EPS particles was the most effective. Compared with the conventional uncoated EPS FLS, the 28d strength of precoated EPS FLS was increased by 41%, and the distribution of EPS particles in the soil is more homogeneous. After 9 drying–wetting cycles, the strength of precoated EPS FLS was 0.349&#xa0;MPa higher than that of uncoated EPS FLS. The SEM–EDS test results revealed that the precoating of EPS particles created a more compact interfacial transition zone (ITZ) with the soil. The mutual bonding of EPS particles to the soil through the coating shell enhanced the integrity of FLS, which was the main reason for the improvement of EPS FLS performance.</p>

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Application of Precoated EPS Particles in Fluid Lightweight Soil: Influencing Factors, Performance Enhancement, and Micro-Mechanisms

  • 期刊论文

  • 发表日期：

    2025年7月25日

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  • Fengrong Zhang,
  • Xianghui Kong,
  • Yunpeng Liang,
  • Jinyu Wan,
  • Xiao Feng,
  • Hongfei Xu

摘要

In order to improve the overall performance of EPS fluid lightweight soil (FLS), EPS particles were precoated. The effects of modifier concentration, coating material type, coating material ratio, and coating material dosage on the coating integrity index (CII) of EPS and FLS strength were investigated and analyzed. Based on this, the optimal precoating scheme for EPS particles was determined. The test results showed that when the EPS was modified with 10% ethylene vinyl acetate (EVA) emulsion, MgO and cement were used as the composite coating materials, the mass ratio of the two was 4:6, and the amount of coating materials was 5 times of the mass of EPS, the coating effect of EPS particles was the most effective. Compared with the conventional uncoated EPS FLS, the 28d strength of precoated EPS FLS was increased by 41%, and the distribution of EPS particles in the soil is more homogeneous. After 9 drying–wetting cycles, the strength of precoated EPS FLS was 0.349 MPa higher than that of uncoated EPS FLS. The SEM–EDS test results revealed that the precoating of EPS particles created a more compact interfacial transition zone (ITZ) with the soil. The mutual bonding of EPS particles to the soil through the coating shell enhanced the integrity of FLS, which was the main reason for the improvement of EPS FLS performance.