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<p>This study investigates the potential application of marble dust (MD) in stabilizing problematic marine clay for use in highway construction. Marine clay was treated with varied proportions of MD ranging from 5 to 25%, along with lime (4, 6, and 8%), to assess improvements in strength properties such as unconfined compressive strength (UCS) and California bearing ratio (CBR). Results showed that the addition of MD reduced consistency limits and optimum moisture content (OMC), while increasing maximum dry density (MDD). For MD–clay mixes, the strength increased with the addition of MD up to 20%. This holds true for MD–lime–clay mixes comprising 4 and 6% lime, whereas the gain in strength peaks at 15% MD content for the MD–8% lime–clay mix. Curing further enhances strength performance. Microstructure analysis confirms the formation of a cementitious compound in stabilized marine clay, which is supported by increased molar ratios of calcium to silicon (Ca:Si), aluminum to silicon (Al:Si), and aluminum to calcium (Al:Ca), and a decreased silicon to aluminum (Si:Al) ratio, indicating a gain in strength. Optimized clay–MD–lime blends that meet the subgrade and sub-base strength requirements, as specified in Indian and international standards, were identified. Furthermore, a model pavement study was conducted using a 1 m × 1 m × 1 m steel tank to assess the strength behavior of unreinforced and geogrid (GG), coir grid (CG), and rubber grid (RG) reinforced sub-bases over native marine clay. The influence of subgrade stabilization with MD and lime was also evaluated for unreinforced and reinforced sub-bases. Reinforced sections consistently demonstrated improved structural performance, with reinforcement placed at the interface between the subgrade and sub-base exhibiting the best performance. Furthermore, the performance of CG was found to be better, followed by RG and GG. Moreover, stabilization of the subgrade significantly enhances the load-settlement behavior of both unreinforced and reinforced pavement sections.</p>

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Experimental study on the behaviour of grid reinforced sub-base overlying clayey subgrade stabilized with marble dust and lime

  • 期刊论文

  • 发表日期：

    2026年4月9日

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  • Aditya D Ahirwar,
  • Hemant Sharad Chore

摘要

This study investigates the potential application of marble dust (MD) in stabilizing problematic marine clay for use in highway construction. Marine clay was treated with varied proportions of MD ranging from 5 to 25%, along with lime (4, 6, and 8%), to assess improvements in strength properties such as unconfined compressive strength (UCS) and California bearing ratio (CBR). Results showed that the addition of MD reduced consistency limits and optimum moisture content (OMC), while increasing maximum dry density (MDD). For MD–clay mixes, the strength increased with the addition of MD up to 20%. This holds true for MD–lime–clay mixes comprising 4 and 6% lime, whereas the gain in strength peaks at 15% MD content for the MD–8% lime–clay mix. Curing further enhances strength performance. Microstructure analysis confirms the formation of a cementitious compound in stabilized marine clay, which is supported by increased molar ratios of calcium to silicon (Ca:Si), aluminum to silicon (Al:Si), and aluminum to calcium (Al:Ca), and a decreased silicon to aluminum (Si:Al) ratio, indicating a gain in strength. Optimized clay–MD–lime blends that meet the subgrade and sub-base strength requirements, as specified in Indian and international standards, were identified. Furthermore, a model pavement study was conducted using a 1 m × 1 m × 1 m steel tank to assess the strength behavior of unreinforced and geogrid (GG), coir grid (CG), and rubber grid (RG) reinforced sub-bases over native marine clay. The influence of subgrade stabilization with MD and lime was also evaluated for unreinforced and reinforced sub-bases. Reinforced sections consistently demonstrated improved structural performance, with reinforcement placed at the interface between the subgrade and sub-base exhibiting the best performance. Furthermore, the performance of CG was found to be better, followed by RG and GG. Moreover, stabilization of the subgrade significantly enhances the load-settlement behavior of both unreinforced and reinforced pavement sections.