Scholarlink

<p>The utilization of geopolymer for solidifying dredged soils not only facilitates the resourceful use of dredged soils, FA, and GGBS but also contributes to a reduction in cement consumption. This study solidified dredged soil by geopolymer, and nano-SiO<sub>2</sub> and LSS-1 ions were added to modify it. All specimens were subjected to strength and water stability, XRD, SEM–EDS, and nuclear magnetic resonance (NMR) tests during freeze–thaw cycling. The modification mechanism of the modifying material was revealed. The results show that the addition of SiO<sub>2</sub> and LSS-1 increased the strength and water stability. The addition of LSS-1 ions promoted ion exchange and reduced the thickness of the bilayer and the repulsive force between soil particles, forming larger agglomerates. Both LSS-1 and nano-SiO<sub>2</sub> promoted the geopolymerization to generate more geopolymer gels to fill the pores and cracks. The reduction in porosity and pore size caused a decrease in the freezing point of pore ice, led less pore water frozen, delayed freeze–thaw damage and improved the resistance of the solidified soil to freeze–thaw cycles.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Modification mechanism of nano-SiO2 and LSS-1 ions on geopolymer-solidified soil: mechanism of microstructure and frost resistance

  • 期刊论文

  • 发表日期：

    2025年8月21日

查看全文
  • Liu Yang,
  • Zhiduo Zhu,
  • He Sun,
  • Xiangqun Zhang,
  • Jiazheng Liu,
  • Junjian Pan,
  • Borui Ma,
  • Wangwen Huo

摘要

The utilization of geopolymer for solidifying dredged soils not only facilitates the resourceful use of dredged soils, FA, and GGBS but also contributes to a reduction in cement consumption. This study solidified dredged soil by geopolymer, and nano-SiO2 and LSS-1 ions were added to modify it. All specimens were subjected to strength and water stability, XRD, SEM–EDS, and nuclear magnetic resonance (NMR) tests during freeze–thaw cycling. The modification mechanism of the modifying material was revealed. The results show that the addition of SiO2 and LSS-1 increased the strength and water stability. The addition of LSS-1 ions promoted ion exchange and reduced the thickness of the bilayer and the repulsive force between soil particles, forming larger agglomerates. Both LSS-1 and nano-SiO2 promoted the geopolymerization to generate more geopolymer gels to fill the pores and cracks. The reduction in porosity and pore size caused a decrease in the freezing point of pore ice, led less pore water frozen, delayed freeze–thaw damage and improved the resistance of the solidified soil to freeze–thaw cycles.