Comparative CBR Analysis and Cost Evaluation of Geopolymer-Stabilized Flexible Pavements for Low-Volume Rural Roads
Keywords:
Cost analysis, CBR, Expansive soil, Geopolymers, Soil stabilizationAbstract
This research paper presents a comparative analysis of California Bearing Ratio (CBR) characteristics and cost evaluation for geopolymer-stabilized flexible pavements in low volume rural roads. The study focuses on alkali activated industrial and agricultural by-products, namely Sugarcane Bagasse Ash (SCBA), Metakaolin (MK), and Fly Ash (FA), blended with Rice Husk Ash (RHA) as geopolymer precursors for subgrade Black Cotton (BC) soil stabilization. Various proportions of the geopolymer mixtures, ranging from 0% to 30% by dry unit weight of soil, were admixed with the BC soil. The CBR values were measured for each combination to assess the strength and stability characteristics of the stabilized soil. Optimal stabilizer doses were determined based on economic and sustainability perspectives. Using the recommended stabilizer doses, flexible pavement designs were developed, considering subgrade strength, traffic loadings, and environmental sustainability. A detailed cost analysis was conducted, incorporating material costs, construction expenses, and maintenance requirements. The research findings offer valuable insights into the design and cost analysis of geopolymer-stabilized flexible pavements for low volume rural roads. The comparative CBR analysis and cost evaluation provide practical guidance for road engineers and decision-makers in selecting appropriate stabilizer combinations. This study contributes to sustainable and cost-effective road construction practices by promoting the utilization of industrial and agricultural by-products in geopolymer stabilization methods for rural road development.
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