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<p>Clay–sandy soils along the El Akkari Road in Marrakech, Morocco, exhibit moderate plasticity (IP = 11–16%) and low soaked bearing capacity (CBR = 8.5–10.5%), limiting their use in pavement subgrades under GMTR standards. This study investigates the effect of incorporating 10% recycled concrete waste (RCW) by dry weight on soil compaction and strength. Laboratory tests, including Modified Proctor and soaked CBR after four days, were performed to assess geotechnical improvements. Results indicate significant enhancement of soil performance: maximum dry density increased to 1.96–2.00&#xa0;g/cm<sup>3</sup>, optimum moisture content decreased to 10.0–10.9%, and CBR values rose to 25–30%, upgrading the soils to St3 bearing capacity. XRD and FTIR analyses confirmed no substantial formation of new cementitious phases, suggesting that stabilization is primarily driven by mechanical mechanisms such as granular interlocking and reduction of the active clay fraction. These findings highlight RCW as a technically effective and sustainable solution for subgrade stabilization, promoting construction waste valorization. Further research is needed to optimize RCW content and evaluate long-term field performance. However, this study is limited to a single RCW content and short-term laboratory conditions; further field validation and durability assessment are required.</p>

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Feasibility study on the mechanical stabilization of a local clay-sandy soil from Marrakech using 10% recycled concrete waste

  • 期刊论文

  • 发表日期：

    2026年6月2日

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  • Noureddine Ouslimane,
  • Hanane Barebita,
  • Fouad Dimane,
  • Mustapha Belfaquir

摘要

Clay–sandy soils along the El Akkari Road in Marrakech, Morocco, exhibit moderate plasticity (IP = 11–16%) and low soaked bearing capacity (CBR = 8.5–10.5%), limiting their use in pavement subgrades under GMTR standards. This study investigates the effect of incorporating 10% recycled concrete waste (RCW) by dry weight on soil compaction and strength. Laboratory tests, including Modified Proctor and soaked CBR after four days, were performed to assess geotechnical improvements. Results indicate significant enhancement of soil performance: maximum dry density increased to 1.96–2.00 g/cm3, optimum moisture content decreased to 10.0–10.9%, and CBR values rose to 25–30%, upgrading the soils to St3 bearing capacity. XRD and FTIR analyses confirmed no substantial formation of new cementitious phases, suggesting that stabilization is primarily driven by mechanical mechanisms such as granular interlocking and reduction of the active clay fraction. These findings highlight RCW as a technically effective and sustainable solution for subgrade stabilization, promoting construction waste valorization. Further research is needed to optimize RCW content and evaluate long-term field performance. However, this study is limited to a single RCW content and short-term laboratory conditions; further field validation and durability assessment are required.