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Influence of Coir Fiber on the Strength and Permeability Characteristics of Bottom Ash- and Lime-Stabilized Laterite Soil

International Journal of Geosynthetics and Ground Engineering, ISSN: 2199-9279, Vol: 9, Issue: 5
2023
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Article Description

Laterite Soil (LS) is a widely used geotechnical material in tropical climatic regions, owing to its availability and good engineering characteristics. However, climate change has caused significant changes in rainfall patterns, leading to increased landslides and slope erosion in the tropics. This study proposes a stabilization technique that utilizes lightweight waste materials, namely Bottom Ash (BA) and Coir Fiber (CF), along with lime (L) as a traditional soil stabilizer, for highway embankment and backfilling applications. The objective is to recommend stabilization materials that enhance the soil’s shear resistance, reduce driving forces that trigger slope failures in saturated soils, and improve the overall performance of embankments and backfilled slopes. Laboratory tests were conducted, including direct shear, splitting tensile strength, and permeability tests, followed by FESEM/EDX analysis to examine the micro-level stabilizing mechanism. The results showed that BA improved the shearing resistance of the LS through enhanced interlocking and packing, increased the soil’s permeability by facilitating additional flow paths through its porous particles, and maintained a neutral effect on tensile strength. The addition of lime to soil-BA mixtures significantly improved cohesion and tensile strength while reducing permeability. CF exhibited a more significant positive impact on tensile strength compared to shear strength and increased permeability when added in a substantial amount. The FESEM/EDX analysis provided insights into the micro-level interaction and stabilizing mechanism of lime-treated mixtures.

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