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<p>This study investigated the impact of crushed stone dust (CSD) and calcium hydroxide (CH) on the geotechnical features of high plasticity lateritic soil (LS). The LS samples were mixed with 0–20% CSD and 0–9% CH by weight of soil specimen. X-ray fluorescence tests were conducted on the CSD, CH and LS samples to determine their oxide compositions. Various geotechnical tests such as sieve analysis, specific gravity (SG), consistency limits, swelling index (SI), compaction, unconfined compressive strength (UCS) and permeability were performed to assess the impact of CSD and CH on the LS properties. Findings showed the soil to be an A-7-6 (30) LS containing high plasticity clay. The results indicated that adding CSD and CH significantly improved the soil's index properties. The plasticity index decreased from 37.98 to 11.1% as 9%CH was added to the soil. The A-7-6 soil became less plastic and more stable as more lime and stone dust were added, resulting in improved workability. With 20%CSD and 9%CH contents, the SI decreased from 31.52 to 15.84%. The SG increased from 2.41 to 2.50. The maximum dry density (MDD) rose from 1.80–1.91 g/cm<sup>3</sup> while optimum moisture content declined from 16.1–14.7% as 6%CH and 15%CSD were added to the soil using West African Standard (WAS) compaction. The UCS values rose from 182.22–1585.5 kPa after 28th day curing with 20%CSD and 6%CH additions. A mixture of 6%CH and 20%CSD that satisfied the minimum UCS of 1.5 MPa for medium traffic sub-base layer is recommended for strength improvement of the soil.</p>

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Modeling the impact of stone dust and hydrated lime in stabilizing high plasticity lateritic soil

  • 期刊论文

  • 发表日期：

    2025年9月18日

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  • Solomon Adedokun,
  • Awwal Makusota,
  • Goodluck Lawani,
  • Qudus Oreagba,
  • Ayomide Smith,
  • Johnson Rotimi Oluremi

摘要

This study investigated the impact of crushed stone dust (CSD) and calcium hydroxide (CH) on the geotechnical features of high plasticity lateritic soil (LS). The LS samples were mixed with 0–20% CSD and 0–9% CH by weight of soil specimen. X-ray fluorescence tests were conducted on the CSD, CH and LS samples to determine their oxide compositions. Various geotechnical tests such as sieve analysis, specific gravity (SG), consistency limits, swelling index (SI), compaction, unconfined compressive strength (UCS) and permeability were performed to assess the impact of CSD and CH on the LS properties. Findings showed the soil to be an A-7-6 (30) LS containing high plasticity clay. The results indicated that adding CSD and CH significantly improved the soil's index properties. The plasticity index decreased from 37.98 to 11.1% as 9%CH was added to the soil. The A-7-6 soil became less plastic and more stable as more lime and stone dust were added, resulting in improved workability. With 20%CSD and 9%CH contents, the SI decreased from 31.52 to 15.84%. The SG increased from 2.41 to 2.50. The maximum dry density (MDD) rose from 1.80–1.91 g/cm3 while optimum moisture content declined from 16.1–14.7% as 6%CH and 15%CSD were added to the soil using West African Standard (WAS) compaction. The UCS values rose from 182.22–1585.5 kPa after 28th day curing with 20%CSD and 6%CH additions. A mixture of 6%CH and 20%CSD that satisfied the minimum UCS of 1.5 MPa for medium traffic sub-base layer is recommended for strength improvement of the soil.