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<p>Thailand's tropical climate has led to the widespread use of laterite soil (LS) in various geotechnical projects. However, the engineering properties of LS often fail to meet the standards required for subbase and base pavement layers. This study explores the potential application of recycled concrete material (RCM) and lime (L) as stabilizers to improve LS’s mechanical properties, enabling it to meet the standard strength requirements set by the Department of Highways (DOH) Thailand for subbase road construction. A series of tests, including compaction, direct shear (DS), unconfined compressive strength, California Bearing Ratio (CBR), and permeability, were conducted on different mix designs. The results showed that adding RCM and lime increased the optimum moisture content while decreasing the maximum dry unit weight of the untreated soil. Notably, LS combined with 45% RCM and 6% L demonstrated higher shear strength with brittle failure characteristics. Additionally, the compressive strength increased by 8.4 times compared to natural soil. The CBR values exceeded the DOH Thailand’s subbase requirements, confirming its suitability for road construction. In terms of hydraulic conductivity, the 45% RCM and LS mix achieved the highest permeability coefficient. Microstructural study through FESEM and EDS analyses revealed enhanced particle bonding and structural integrity due to the presence of cementitious compounds. These findings suggest that using RCM as soil replacement material provides an eco-friendly and cost-effective solution for road pavement applications.</p>

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Use of Recycled Concrete Material with Laterite Soil as a Subbase Material for Pavement Construction

  • 期刊论文

  • 发表日期：

    2025年6月22日

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  • Syaifulloh Qoimuddin Ali Basyah,
  • Amin Eisazadeh

摘要

Thailand's tropical climate has led to the widespread use of laterite soil (LS) in various geotechnical projects. However, the engineering properties of LS often fail to meet the standards required for subbase and base pavement layers. This study explores the potential application of recycled concrete material (RCM) and lime (L) as stabilizers to improve LS’s mechanical properties, enabling it to meet the standard strength requirements set by the Department of Highways (DOH) Thailand for subbase road construction. A series of tests, including compaction, direct shear (DS), unconfined compressive strength, California Bearing Ratio (CBR), and permeability, were conducted on different mix designs. The results showed that adding RCM and lime increased the optimum moisture content while decreasing the maximum dry unit weight of the untreated soil. Notably, LS combined with 45% RCM and 6% L demonstrated higher shear strength with brittle failure characteristics. Additionally, the compressive strength increased by 8.4 times compared to natural soil. The CBR values exceeded the DOH Thailand’s subbase requirements, confirming its suitability for road construction. In terms of hydraulic conductivity, the 45% RCM and LS mix achieved the highest permeability coefficient. Microstructural study through FESEM and EDS analyses revealed enhanced particle bonding and structural integrity due to the presence of cementitious compounds. These findings suggest that using RCM as soil replacement material provides an eco-friendly and cost-effective solution for road pavement applications.