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<p>The condition of certain roadways in the southwestern region of Nigeria is relatively poor due to pavement failure. This study aims to assess the effect of saw dust ash (SDA) on the geotechnical properties of 6% lime-stabilized soil. Eighteen (18) selected burrow pit soil samples (one from each southwestern Nigeria senatorial district) used for road construction were selected for this study. X-ray fluorescence (XRF) was conducted on the SDA to obtain its oxide composition. 6% Lime was predominantly established as the best lime addition for the geopolitical zone soil. SDA was additionally incorporated into the lime-stabilized soil at proportions of 0%, 2%, 4%, 6%, 8%, and 10% based on the dry weight of the 6% lime-soil mixture. Geotechnical tests, including compaction, California Bearing Ratio (CBR), unconfined compressive strength (UCS), and Triaxial test, were performed on the lime – SDA – Soil mixture. The results showed that SDA has high SiO<sub>2</sub> content and that all strength properties—Maximum Dry Density (MDD), CBR, UCS, Cohesion (C), shear strength (<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="42947_2025_589_Article_IEq1.gif" Format="GIF" Height="10" Rendition="HTML" Resolution="72" Type="Linedraw" Width="11" /> </InlineMediaObject> <EquationSource Format="TEX">\(\tau\)</EquationSource> <EquationSource Format="MATHML"><math> <mi>τ</mi> </math></EquationSource> </InlineEquation>), and angle of internal friction (φ) increase as SDA content increases and reaches the optimum at 4% SDA content, then decreases afterward. The optimum moisture content (OMC) decreases with increased SDA content. After stabilization, most unsuitable soil samples became suitable for pavement layer materials. The mixture of 6% optimum lime and 4% SDA content is strongly recommended for soil improvement, particularly for road construction in Southwestern Nigeria. </p>

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Effect of Sawdust Ash on Selected Geotechnical Properties of Lime-Stabilized Lateritic Soil for Road Applications

  • 期刊论文

  • 发表日期：

    2025年7月15日

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  • Sunday Olubunmi Faluyi,
  • Folahan Okeola Ayodele,
  • Olugbenga Oludolapo Amu

摘要

The condition of certain roadways in the southwestern region of Nigeria is relatively poor due to pavement failure. This study aims to assess the effect of saw dust ash (SDA) on the geotechnical properties of 6% lime-stabilized soil. Eighteen (18) selected burrow pit soil samples (one from each southwestern Nigeria senatorial district) used for road construction were selected for this study. X-ray fluorescence (XRF) was conducted on the SDA to obtain its oxide composition. 6% Lime was predominantly established as the best lime addition for the geopolitical zone soil. SDA was additionally incorporated into the lime-stabilized soil at proportions of 0%, 2%, 4%, 6%, 8%, and 10% based on the dry weight of the 6% lime-soil mixture. Geotechnical tests, including compaction, California Bearing Ratio (CBR), unconfined compressive strength (UCS), and Triaxial test, were performed on the lime – SDA – Soil mixture. The results showed that SDA has high SiO2 content and that all strength properties—Maximum Dry Density (MDD), CBR, UCS, Cohesion (C), shear strength ( \(\tau\) τ ), and angle of internal friction (φ) increase as SDA content increases and reaches the optimum at 4% SDA content, then decreases afterward. The optimum moisture content (OMC) decreases with increased SDA content. After stabilization, most unsuitable soil samples became suitable for pavement layer materials. The mixture of 6% optimum lime and 4% SDA content is strongly recommended for soil improvement, particularly for road construction in Southwestern Nigeria.