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The methylene blue value (MBV) test was used to determine the effectiveness of calcium carbide residue (CCR) in imparting short-term clay soil modification and to determine the percentage of CCR required to achieve optimum flocculation. The MBV of both untreated and treated clay mixed with different percentages of CCR (6, 9, and 12%) are compared. The results show the MBV gradual reduction with an increase in CCR content and reached a flex point at 9% CCR inclusion. The MBV reduced from 2.33 g/100g for untreated clay to 0.75 g/100g for 9% CCR-treated clay and remained constant with a further increase of CCR to 12%. This MBV can be used to determine the susceptibility of clay to effective modification, track the surface area transition of soil particles, and quantify the amount of CCR required for short-term modification. The chemical evolution of the soil was confirmed using the results of X-ray powder diffraction (XRD), and infrared spectroscopy (IR). The micro-level analysis affirms the cation-exchange reaction and flocculation of clay due to the reactivity of CCR. The MBV analysis along with pH value is recommended as an efficacious preliminary test to confirm the flex value of CCR required for immediate reactivity with clay.

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Effectiveness of Methylene Blue Value Test to Assess the Modification in Calcium Carbide Residue Treated Clayey Subgrade Soil

  • 会议论文

  • 发表日期：

    2025年

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  • A. G. Sharanya,
  • M. Heeralal,
  • T. Thyagaraj

摘要

The methylene blue value (MBV) test was used to determine the effectiveness of calcium carbide residue (CCR) in imparting short-term clay soil modification and to determine the percentage of CCR required to achieve optimum flocculation. The MBV of both untreated and treated clay mixed with different percentages of CCR (6, 9, and 12%) are compared. The results show the MBV gradual reduction with an increase in CCR content and reached a flex point at 9% CCR inclusion. The MBV reduced from 2.33 g/100g for untreated clay to 0.75 g/100g for 9% CCR-treated clay and remained constant with a further increase of CCR to 12%. This MBV can be used to determine the susceptibility of clay to effective modification, track the surface area transition of soil particles, and quantify the amount of CCR required for short-term modification. The chemical evolution of the soil was confirmed using the results of X-ray powder diffraction (XRD), and infrared spectroscopy (IR). The micro-level analysis affirms the cation-exchange reaction and flocculation of clay due to the reactivity of CCR. The MBV analysis along with pH value is recommended as an efficacious preliminary test to confirm the flex value of CCR required for immediate reactivity with clay.