Empirical Modeling and Correlation Analysis of Soil Properties for Alkali-Activated Blended Soils
Keywords:
Cost analysis, California Bearing Ratio (CBR), Expansive soil, Geopolymers, Soil stabilizationAbstract
This research paper presents a comprehensive investigation of the development of mathematical models and correlation analysis to establish empirical relationships between the Unconfined Compressive Strength (UCS) and California Bearing Ratio (CBR) of alkali-activated blended soils with various engineering properties. The study focuses on alkali-activated Rice Husk Ash (RHA) blended with Fly Ash (FA), Metakaolin (MK), and Sugar Cane Bagasse Ash (SCBA). A meticulous review of existing literature guided the determination of mix proportions, wherein soil samples were admixed with RHA-FA, RHA-MK, and RHA-SCBA at different proportions ranging from 0% to 30%. The binder combination employed a fixed ratio of RHA to FA/MK/SCBA at 1:3, with 25% RHA and 75% FA/MK/SCBA, while the alkali activator ratio (Na2SiO3: NaOH) was fixed at 2.5. The development of mathematical models was facilitated by linear regression and multiple regression analyses, with dedicated computer programs created using Python programming language. The efficacy of the proposed models was examined by comparing measured and predicted values of UCS and CBR for various blended soil specimens encompassing different curing durations. To validate the findings, a series of laboratory tests, including compaction, UCS, CBR, free swell index, and Atterberg's limits, were conducted on both natural black cotton soil and admixed soil specimens, complying with the relevant IS Code.
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