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Soft soil as a pavement subgrade leads to early pavement failure or increased pavement thickness. Ground improvement techniques have been used as a solution to this. The published studies on coir waste treated soft soil depict that the adverse volume change characteristics of clayey soils are mitigated by the resistance offered by coir waste. However, on analyzing, it can be seen that the engineering properties of coir waste treated soil are on a lower side. Hence, an additional stabilizer lime was used in combination with coir waste to investigate the enhancement in strength and reduction in deformation behavior. This paper presents the experimental studies carried out to investigate how the addition of lime to soil treated with coir waste affects various aspects like compression behavior, undrained shear strength, and deformation behavior. The degree of expansion and effect of the curing period was also analyzed and an optimized design model was arrived to quantify the strength in terms of lime content added to the coir waste treated soil and its curing period. Design charts for pavement thickness over treated subgrade soil were also developed.

Optimization, quantification of Strength and Design Benefits of Flexible Pavements Resting on Soft Soil Subgrades Treated with Coir Waste and Lime