AN EXPERIMENTAL STUDY ON HYBRID STABILIZATION OF EXPANSIIVE SOILS USING LIME, COIR FIBER AND POLYPROPYLENE FIBER REINFORCEMENT

Abstract

Expansive soils exhibit significant volume change due to moisture variation, causing severe damage to pavements, foundations, and light structures. This study investigates the effectiveness of hybrid stabilization using Lime, Coir Fiber, and Polypropylene Fiber in improving the engineering properties of expansive soil. Lime was added in proportions of 4%, 5%, and 6% by dry weight of soil. Coir fiber was added at 0.25%, 0.5%, and 0.75%, while polypropylene fiber was added at 0.1%, 0.25%, and 0.5%. Laboratory tests including Atterberg limits, Standard Proctor Compaction, Sieve Analysis, Specific Gravity, Unconfined Compressive Strength (UCS), California Bearing Ratio (CBR), and Swell Tests were conducted. The study evaluates the improvement in strength, compaction, and swelling characteristics due to chemical and mechanical stabilization. Results indicate significant reduction in plasticity and swell potential, and substantial improvement in strength and bearing capacity. The hybrid combination showed superior performance compared to individual stabilization