Date of Award
6-12-2025
Document Type
Thesis
Degree Name
Engineering, MSE
First Advisor
Zahid Hossain
Committee Members
Alan Meadors; Ashraf Elsayed
Abstract
Subgrade soil critically impacts pavement lifespan, where poor conditions lead to premature failure. This study evaluates soil stabilization of AASTHO classified, A-4 and A-6 soil, using sustainable additives: Rice Husk Ash (RHA), Reclaimed Fly Ash (RFA), and a traditional stabilizer Hydrated Lime (HL). Laboratory tests (Atterberg Limits, Modified Proctor, California Bearing Ratio (CBR), and Free Swell) were conducted on untreated and treated soils with RHA (3%, 6%, and 9% by weight), HL (1%, 3%, and 5% by weight), RFA (4%, 6%, and 8% by weight), and combinations of HL + RHA. Results showed all stabilizers improved strength and reduced swell. For A-6 soil, 1% HL + 4% RHA achieved better performance (0.07% swell, 5.37 CBR). For A-4 soil, 3% RHA + 1% HL provide balanced solution (0.35% swell, 3.25 CBR). Although 5% HL achieved the highest strength, HL-RHA blends were eco-efficient, emphasizing the importance of soil-specific, sustainable stabilizer selection.
Rights Management
This work is licensed under a Creative Commons Attribution 4.0 International License.
Recommended Citation
Mallick, Orchi, "Optimizing The Use of Sustainable Additives In Subgrade Soil Stabilization" (2025). Student Theses and Dissertations. 755.
https://arch.astate.edu/all-etd/755
