Correlation of Methylene Blue Value with the Behavior of Natural and Stabilized Expansive Soils

This study investigates the expansive nature of soils from various regions in Indonesia, focusing on their natural and post-stabilization characteristics. The research aims to bridge the gap in understanding the relationship between Methylene Blue Value (MBV) and soil expansivity, both in natural and stabilized states. Soil samples were systematically collected from seven locations across three Indonesian islands and subjected to a range of laboratory tests, including X-ray diffraction analysis, to determine their properties and mineral composition. Compaction and swell tests were conducted to establish Maximum Dry Density (MDD) and Optimum Moisture Content (OMC), as well as swell pressure and free swell parameters. The study further explored soil improvement techniques using cement and lime stabilizers at varying concentrations from 5% to 15%. The results indicated that both cement and lime significantly reduce swell pressure and free swell, with a 15% additive concentration being optimal for mitigation. The analysis revealed a strong correlation between MBV and soil expansivity, with higher MBV values indicating greater expansivity. Regression analysis showed a non-linear relationship between MBV and swell pressure, explaining 97.8% of the variation in swell pressure. Additionally, a linear relationship between MBV and the expansive mineral content was identified, suggesting that the Methylene Blue Test can serve as a cost-effective and rapid substitute for identifying expansive minerals in the soil. The findings highlight the reliability of MBV as an indicator of soil behavior and its potential application in predicting soil expansivity. Doi: 10.28991/CEJ-2025-011-05-020 Full Text: PDF