ENGINEERING PROPERTIES OF CLAY STABILIZED WITH EUCALYPTUS WOOD ASH AND STONE DUST FOR ROAD EMBANKMENT MATERIAL
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Abstract
Eucalyptus wood ash and stone dust are industrial by-products with the potential for reuse in civil engineering applications, particularly for improving the properties of clayey soils, which cannot be directly used as embankment materials due to their low shear strength, low bearing capacity, and high swelling behavior. This research aims to investigate the effects of partially replacing clay with eucalyptus wood ash and stone dust at various proportions to enhance soil strength and reduce the consumption of natural materials. The laboratory tests conducted include the California Bearing Ratio (CBR), swelling, and Direct Shear tests. All specimens were prepared at their Optimum Moisture Content (OMC) and Maximum Dry Density (MDD) in accordance with ASTM D1557. The test results indicate that the addition of eucalyptus wood ash helps densify the soil structure by filling voids, while stone dust increases the internal friction within the mixture. Consequently, the CBR value increased from 5% in natural clay to a maximum of approximately 33–42% at the optimal mixture proportion. Meanwhile, the cohesion (c) tended to decrease with increasing proportions of replacement materials, whereas the internal friction angle (φ) significantly increased. Overall, the mixture of eucalyptus wood ash and stone dust can effectively improve the engineering properties of clay, making it suitable for use as embankment fill material in accordance with the Department of Rural Roads standard DRR 201/2545.
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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
The published articles are copyright of the Engineering Journal of Research and Development, The Engineering Institute of Thailand Under H.M. The King's Patronage (EIT).
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