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<p>The persistent failure of pavement layers in tropical regions has been linked to the weak engineering properties of subgrade soils, which are often exacerbated by the high cost and environmental burden of conventional stabilizers. This study evaluates the effectiveness of Locust Bean Pod Ash (LBPA), in combination with nano-chemical admixtures Terrasil and Zycobond, in improving the strength characteristics of weak lateritic soil for subgrade applications. Lateritic soil was stabilized using LBPA at 0–6% and modified with Terrasil, Zycobond, and their blend at 0–9%. Geotechnical tests, Atterberg limits, compaction, California Bearing Ratio (CBR), and Unconfined Compressive Strength (UCS), were conducted in accordance with BS 1377 standards. Results showed that LBPA-Terrasil-Zycobond combinations significantly improved strength parameters, with UCS increasing from 235.1 kN/m² to 530.4 kN/m², and unsoaked CBR from 30.8% to 95.3%. The optimal performance was recorded at 6% LBPA and 9% Terrasil-Zycobond. ANOVA revealed statistically significant effects (p &lt; 0.05) of both LBPA and nano-admixtures on strength development. These findings demonstrate the potential of integrating agricultural waste with nano-modifiers to provide a cost-effective and environmentally sustainable solution for subgrade stabilization in light-trafficked road construction. The Laterite modified with 6% LBPA and 9% Terrasil-Zycobond have the best and efficient geotechnical properties and met the requirement to be used for subbase application. It is recommended for use in the construction of light-trafficked road.</p>

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Evaluation of Strength Characteristics of Lateritic Soil Stabilised with Locust Bean Pod Ash Using Terrasil and Zycobond as Admixtures

  • 期刊论文

  • 发表日期：

    2025年11月28日

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  • Olatunji Sunday Olaniyan,
  • Sherif Okewale Okesiji,
  • Lateef Olaleye Ismail,
  • Oluwafemi Iyanuoluwa Adebiyi

摘要

The persistent failure of pavement layers in tropical regions has been linked to the weak engineering properties of subgrade soils, which are often exacerbated by the high cost and environmental burden of conventional stabilizers. This study evaluates the effectiveness of Locust Bean Pod Ash (LBPA), in combination with nano-chemical admixtures Terrasil and Zycobond, in improving the strength characteristics of weak lateritic soil for subgrade applications. Lateritic soil was stabilized using LBPA at 0–6% and modified with Terrasil, Zycobond, and their blend at 0–9%. Geotechnical tests, Atterberg limits, compaction, California Bearing Ratio (CBR), and Unconfined Compressive Strength (UCS), were conducted in accordance with BS 1377 standards. Results showed that LBPA-Terrasil-Zycobond combinations significantly improved strength parameters, with UCS increasing from 235.1 kN/m² to 530.4 kN/m², and unsoaked CBR from 30.8% to 95.3%. The optimal performance was recorded at 6% LBPA and 9% Terrasil-Zycobond. ANOVA revealed statistically significant effects (p < 0.05) of both LBPA and nano-admixtures on strength development. These findings demonstrate the potential of integrating agricultural waste with nano-modifiers to provide a cost-effective and environmentally sustainable solution for subgrade stabilization in light-trafficked road construction. The Laterite modified with 6% LBPA and 9% Terrasil-Zycobond have the best and efficient geotechnical properties and met the requirement to be used for subbase application. It is recommended for use in the construction of light-trafficked road.