Evaluation Of Sugarcane Bagasse Ash as A Subgrade Stabilizing Material: A Case Study in Bangladesh

Abstract

Soil stabilization is crucial for improving subgrade performance in road construction, enhancing durability, and reducing maintenance costs. Sugarcane Bagasse Ash (SBA), a by-product of sugarcane processing, shows promise as a cost-effective and environmentally friendly stabilizer due to its pozzolanic properties. This study evaluates the effectiveness of SBA as a subgrade stabilizer in Bangladesh. Soil samples collected from the Hatikumrul-Bonpara highway were treated with varying percentages (5%, 10%, 15%, and 20%) of SBA by weight. Laboratory tests including Atterberg Limits, Standard Proctor, and Unconfined Compressive Strength (UCS) were conducted to assess changes in soil properties. Results indicate that SBA reduces Plasticity Index (PI), increases Maximum Dry Density (MDD) up to 15% SBA content, and significantly enhances UCS, peaking at 204.5 kPa with 15% SBA. Optimal stabilization effects were consistently observed at 15% SBA content. This study demonstrates that SBA can effectively improve subgrade soil properties in Bangladesh, suggesting its potential as a sustainable alternative to conventional stabilizers like lime and cement.