Black Cotton Soil Stabilization by Using Bio-enzyme and Marble Dust Powder for Pavement Subgrade

Black cotton soils (BCSs), characterized by their susceptibility to vertical ground movements and their detrimental impact on geotechnical structures and pavements, present significant challenges. These issues are particularly pronounced in areas with subpar subgrade soils, rendering conventional pavement construction economically prohibitive. To meet this pressing need, there is a growing shift toward investigating non-traditional, sustainable, and cost-effective solutions. Regrettably, there is a scarcity of research concerning the reaction mechanisms underlying non-traditional soil stabilization methods. In response, this study explores the potential of marble dust (MD) as a soil stabilizer and bio-enzyme (BE), an environmentally friendly and non-toxic liquid enzyme that expedites soil stabilization during construction. The study's primary objectives encompass the assessment of key geotechnical parameters such as compaction, Atterberg's limits, and Unconfined Compressive Strength while varying the proportions of marble dust and bio-enzyme. Furthermore, it employs microstructural-driven analytical techniques to investigate the reaction mechanisms driving this innovative soil stabilization approach. The findings offer promising prospects for mitigating the expansion of reactive soils and promoting sustainable solid waste management practices.