Scholarlink

<p>Clay soils often exhibit low strength and high compressibility, making them unsuitable for construction without stabilization. This study investigates the combined effect of fly ash (5–25%) and nano-silica (0.25–2%) on the engineering behaviour of high-plasticity clay. Standard Proctor compaction and unconfined compressive strength (UCS) tests were conducted at curing periods of 0, 7, 14, and 28 days. Results indicate that the optimum mix was obtained at 15% fly ash and 1.0% nano-silica (Mix ID 9), which yielded a maximum dry density of 1.66&#xa0;g/cc and an optimum moisture content of 20.8%. The UCS significantly increased from approximately 200&#xa0;kPa at 0 days to 500&#xa0;kPa at 28 days, showing substantial strength improvement compared to untreated soil. Shear strength parameters also improved, with cohesion increasing up to 250&#xa0;kPa and friction angle reaching 32.8° after 28 days of curing. The improvement in engineering properties is attributed to enhanced particle bonding and pozzolanic reactions facilitated by the combined action of fly ash and nano-silica. The study demonstrates that the synergistic use of these materials provides an effective and sustainable solution for stabilizing weak clay soils.</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

Synergistic effects of fly ash and nano-silica on the mechanical behaviour of clay soil

  • 期刊论文

  • 发表日期：

    2026年6月27日

查看全文
  • Jayashree J,
  • Ramesh Kannan J,
  • Shri Hari Varshaa S,
  • Swathi GP

摘要

Clay soils often exhibit low strength and high compressibility, making them unsuitable for construction without stabilization. This study investigates the combined effect of fly ash (5–25%) and nano-silica (0.25–2%) on the engineering behaviour of high-plasticity clay. Standard Proctor compaction and unconfined compressive strength (UCS) tests were conducted at curing periods of 0, 7, 14, and 28 days. Results indicate that the optimum mix was obtained at 15% fly ash and 1.0% nano-silica (Mix ID 9), which yielded a maximum dry density of 1.66 g/cc and an optimum moisture content of 20.8%. The UCS significantly increased from approximately 200 kPa at 0 days to 500 kPa at 28 days, showing substantial strength improvement compared to untreated soil. Shear strength parameters also improved, with cohesion increasing up to 250 kPa and friction angle reaching 32.8° after 28 days of curing. The improvement in engineering properties is attributed to enhanced particle bonding and pozzolanic reactions facilitated by the combined action of fly ash and nano-silica. The study demonstrates that the synergistic use of these materials provides an effective and sustainable solution for stabilizing weak clay soils.