International Journal of Research and Development in Engineering Sciences https://www.ijrdes.com C. Balaji 7 5 (September - October) 2025 09 September-October enBiopolymer Soil TreatmentGellan GumClayey Soil StabilizationUnconfined Compression Test. Clay soil stabilization is a critical aspect of geotechnical engineering as untreated clay often exhibits low strength high plasticity and poor workability This study presents an experimental investigation into the stabilization of clayey soil using varying proportions of Gellan Gum a natural biodegradable biopolymer known for its ecofriendly characteristics Gellan Gum was incorporated at dosages of 10 15 and 20 by dry weight of soil to evaluate its effectiveness in enhancing the geotechnical properties of clay A comprehensive suite of laboratory tests was performed including Unconfined Compressive Strength UCS sieve analysis Atterberg limits liquid and plastic limits and the Standard Proctor compaction test The results demonstrated a significant increase in UCS values and a notable reduction in the plasticity index with increasing Gellan Gum content Additionally minor changes in compaction characteristics were observed indicating improved workability The findings highlight the potential of Gellan Gum as a sustainable and environmentally responsible alternative to conventional chemical stabilizers for improving the strength and consistency of problematic clayey soils Copyright (c) 2026 International Journal of Research and Development in Engineering Sciences. All rights reserved. 2025 All Rights Reserved