Experimental Analysis on Improving the Soil Characteristics by Stabilization of Black Cotton Soil Using Coir or Coconut Fibre

Abstract

One of the most widely utilized methods for improving poor soils is soil reinforcement. Metal strips,
natural and synthetic fibers arranged randomly, geogrid sheets, synthetic and natural geotextiles, and
metal strips are examples of materials used for soil reinforcement. Additionally, the tensile strength,
shear strength, other characteristics, bearing capacity, and economy are all significantly improved by
the soil reinforcement. The utilization of jute fibre in civil engineering is beneficial for enhancing soil
qualities due to its affordability, accessibility, biodegradability, and environmental friendliness. The
objective of this experiment is to explore the influence of varying percentages—0.25%, 0.50%, 1.0%,
2.0%, and 3.0%—of jute fiber reinforcement on the CBR (California Bearing Ratio) qualities of soil.
The findings of the tests reveal a consistent augmentation in the CBR characteristics of soil with the
increasing presence of fiber. Moreover, a direct correlation was observed between the rise in fiber
content and the corresponding increase in the CBR value of the reinforced soil. This discernible
enhancement in CBR values, particularly in soil reinforced with jute fiber, serves as substantial
evidence of a significant alteration in engineering behavior. For this investigation, a total of five soil
samples, both with and without reinforcement, were meticulously prepared at their respective
maximum dry densities, maintaining ideal moisture content within the CBR mold. Subsequent
laboratory analysis yielded CBR values for both unsoaked soil and soil reinforced with jute fiber. The
results unequivocally demonstrate a positive correlation between the increase in fiber content and the
subsequent rise in CBR value of the soil. Additionally, it was shown that the CBR value of reinforced
soil improves significantly with the length of the fiber increases, reaching a range of 1.5% to 2.0%.
The thickness of pavement subgrade can be significantly reduced, and construction costs can be
significantly decreased, thanks to the soil reinforced with jute fiber showing a large improvement in
CBR value.